Draft California 2026 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 5 - Central Valley Region

Water Body Name:	South Fork Cosumnes River
Water Body ID:	CAR5322406020190712039302
Water Body Type:	River & Stream


DECISION ID	160258	Region 5
South Fork Cosumnes River

Pollutant:	Temperature, water
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2024)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 160258, Temperature, water	Region 5
South Fork Cosumnes River

LOE ID:

332990

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for South Fork Cosumnes River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat from the Cosumnes Watershed Stewardship Coalition for the 2026 Integrated Report in Region 5

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans).

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site: 532COS012 (Cosumnes River South Fork Reference Site).

Temporal Representation:

The samples were collected between the dates of 2019-07-20 and 2021-06-19

Environmental Conditions:

QAPP Information:

QAPP for Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160258, Temperature, water	Region 5
South Fork Cosumnes River

LOE ID:

243306

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STORET data for South Fork Cosumnes River to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-B1411001)

Temporal Representation:

The samples were collected between the dates of 2010-10-25 and 2016-04-13

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 160258, Temperature, water	Region 5
South Fork Cosumnes River

LOE ID:

243276

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-B1411001)

Temporal Representation:

The samples were collected between the dates of 2010-10-25 and 2016-04-13

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 160258, Temperature, water	Region 5
South Fork Cosumnes River

LOE ID:

243161

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-B1411001)

Temporal Representation:

The samples were collected between the dates of 2010-10-25 and 2016-04-13

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 160258, Temperature, water	Region 5
South Fork Cosumnes River

LOE ID:

231048

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EDTU Cosumnes River WQ Monitoring Program data for South Fork Cosumnes River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2016-05-21 and 2016-07-16

Environmental Conditions:

QAPP Information:

ARC Cosumnes River Monitoring Program. 2015. QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2016. QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program.

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160258, Temperature, water	Region 5
South Fork Cosumnes River

LOE ID:

231047

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for South Fork Cosumnes River to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2017-06-17 and 2018-07-20

Environmental Conditions:

QAPP Information:

ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160258, Temperature, water	Region 5
South Fork Cosumnes River

LOE ID:

231065

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2016-05-21 and 2016-07-16

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160258, Temperature, water	Region 5
South Fork Cosumnes River

LOE ID:

231066

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2017-06-17 and 2018-07-20

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160258, Temperature, water	Region 5
South Fork Cosumnes River

LOE ID:

231067

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2016-05-21 and 2016-07-16

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160258, Temperature, water	Region 5
South Fork Cosumnes River

LOE ID:

231064

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2017-06-17 and 2018-07-20

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program


DECISION ID	160257	Region 5
South Fork Cosumnes River

Pollutant:	pH
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2024)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 160257, pH	Region 5
South Fork Cosumnes River

LOE ID:

229509

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EDTU Cosumnes River WQ Monitoring Program data for South Fork Cosumnes River to determine beneficial use support and results are as follows: 1 of 3 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2016-05-21 and 2016-07-16

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160257, pH	Region 5
South Fork Cosumnes River

LOE ID:

229401

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2017-06-17 and 2018-07-20

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160257, pH	Region 5
South Fork Cosumnes River

LOE ID:

229521

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2017-06-17 and 2018-07-20

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160257, pH	Region 5
South Fork Cosumnes River

LOE ID:

229550

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2016-05-21 and 2016-07-16

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160257, pH	Region 5
South Fork Cosumnes River

LOE ID:

332508

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat from the Cosumnes Watershed Stewardship Coalition for the 2026 Integrated Report in Region 5

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 532COS012 (Cosumnes River South Fork Reference Site).

Temporal Representation:

The samples were collected between the dates of 2019-07-20 and 2021-06-19

Environmental Conditions:

QAPP Information:

QAPP for Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160257, pH	Region 5
South Fork Cosumnes River

LOE ID:

229403

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2016-05-21 and 2016-07-16

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160257, pH	Region 5
South Fork Cosumnes River

LOE ID:

242681

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STORET data for South Fork Cosumnes River to determine beneficial use support and results are as follows: 1 of 11 samples exceeded the water quality threshold for pH.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-B1411001)

Temporal Representation:

The samples were collected between the dates of 2010-10-25 and 2016-04-13

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 160257, pH	Region 5
South Fork Cosumnes River

LOE ID:

242982

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STORET data for South Fork Cosumnes River to determine beneficial use support and results are as follows: 1 of 11 samples exceeded the water quality threshold for pH.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-B1411001)

Temporal Representation:

The samples were collected between the dates of 2010-10-25 and 2016-04-13

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 160257, pH	Region 5
South Fork Cosumnes River

LOE ID:

242585

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STORET data for South Fork Cosumnes River to determine beneficial use support and results are as follows: 1 of 11 samples exceeded the water quality threshold for pH.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-B1411001)

Temporal Representation:

The samples were collected between the dates of 2010-10-25 and 2016-04-13

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 160257, pH	Region 5
South Fork Cosumnes River

LOE ID:

229611

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2017-06-17 and 2018-07-20

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program


DECISION ID	160256	Region 5
South Fork Cosumnes River

Pollutant:	Oxygen, Dissolved
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2020)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Six lines of evidence are available in the administrative record to assess this pollutant. Six of 13 samples exceed the objective for aquatic life and six of 13 samples exceed the objective for fish spawning. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Six of 13 samples exceed the objective for aquatic life and six of 13 samples exceed the objective for fish spawning and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 160256, Oxygen, Dissolved	Region 5
South Fork Cosumnes River

LOE ID:

208032

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for South Fork Cosumnes River to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2017-06-17 and 2018-07-20

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160256, Oxygen, Dissolved	Region 5
South Fork Cosumnes River

LOE ID:

207998

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2016-05-21 and 2016-07-16

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160256, Oxygen, Dissolved	Region 5
South Fork Cosumnes River

LOE ID:

332126

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for South Fork Cosumnes River to determine beneficial use support and results are as follows: 2 of 4 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat from the Cosumnes Watershed Stewardship Coalition for the 2026 Integrated Report in Region 5

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 532COS012 (Cosumnes River South Fork Reference Site).

Temporal Representation:

The samples were collected between the dates of 2019-07-20 and 2021-06-19

Environmental Conditions:

QAPP Information:

QAPP for Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160256, Oxygen, Dissolved	Region 5
South Fork Cosumnes River

LOE ID:

208978

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2016-05-21 and 2016-07-16

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Trout Unlimited El Dorado Chapter Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160256, Oxygen, Dissolved	Region 5
South Fork Cosumnes River

LOE ID:

332127

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat from the Cosumnes Watershed Stewardship Coalition for the 2026 Integrated Report in Region 5

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 532COS012 (Cosumnes River South Fork Reference Site).

Temporal Representation:

The samples were collected between the dates of 2019-07-20 and 2021-06-19

Environmental Conditions:

QAPP Information:

QAPP for Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

Line of Evidence (LOE) for Decision ID 160256, Oxygen, Dissolved	Region 5
South Fork Cosumnes River

LOE ID:

207558

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (532COS012)

Temporal Representation:

The samples were collected between the dates of 2017-06-17 and 2018-07-20

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program

QAPP Information Reference(s):

QAPP for Consumnes River Water Quality Monitoring Program