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California Water Boards' Annual Performance Report - Fiscal Year  2017-18 

REGULATE: NPDES STORMWATER FACILITIES

GROUP:
NPDES STORMWATER FACILITIES

MESSAGE:  
The Storm water program actions largely focus on construction and industrial activities.
MEASURE: 
STORMWATER FACILITIES BY TYPE

Key Statistics for FY 2017-18
Number of Construction Facilities11,281
Number of Industrial Facilities12,659
Number of Municipal-MS4619

MEASUREMENTS  - Data Last Updated on: 11-21-2018 (12:36 pm)

Regional
Offices		 Construction Industrial Municipal Total
129143132754
21,6551,7261193,500
3750674561,480
41,6793,6741145,467
5F1,075494491,618
5R23823312483
5S1,6211,294802,995
5 all.2,9342,0211415,096
6A85386129
6B3232025530
6 all.40824011659
734118418543
81,7582,470774,305
91,4651,239512,755
TOTAL11,28112,65961924,559
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abcdefhiklmnopqrstuvwxyz01.2K2.4K3.6K4.8K6KRegion 1Region 2Region 3Region 4Region 5FRegion 5RRegion 5SRegion 6ARegion 6BRegion 7Region 8Region 9Construction Industrial Municipal

WHAT THE MEASURE IS SHOWING

In Fiscal Year (FY) 2017-18, the Storm Water Program regulated 11,281 construction facilities, 12,659 industrial facilities, and 619 municipal separate storm sewer system (MS4) facilities. These facilities are concentrated in the large urbanized areas with the majority of facilities located in the San Francisco Bay Region (Region 2), the Los Angeles Region (Region 4), the Central Valley Region (Region 5), and San Ana Region (Region 8).

WHY THIS MEASURE IS IMPORTANT

The Construction Storm Water Program is unique in that the industrial activity (i.e., construction and land disturbance) is temporary in nature. This program is highly dynamic, receiving many new applications under the construction general order every year. As construction activities begin, construction projects must enroll under the general order, and when construction activities are completed, enrollees must submit a notice of termination. Due to the high turnover of construction projects, the processing of all new applications and permit rescissions represent a significant portion of the program's workload. The Industrial Storm Water Program regulates a large number of facilities statewide, and although the program's activity is not as temporary in nature as the Construction Storm Water Program, the industrial program requires frequent verification that facilities (both new and previously enrolled) are in compliance with NPDES storm water regulations. Non-municipal, or industrial sources, often generate wastewater that is discharged to surface waters. The types of wastewater generated at a facility depend on the specific activities undertaken and may include manufacturing or process wastewaters, cooling waters, sanitary wastewater, and storm water runoff. The Industrial Storm Water Program is highly dynamic and many new applications are received each year. Processing new applications and rescinding existing permits requires a significant amount of time and resources, and is considered a good indicator of overall program performance. MS4 Permits require the discharger to develop and implement a Storm Water Management Plan/Program with the goal of reducing the discharge of pollutants to the Maximum Extent Practicable (MEP; the performance standard specified in Section 402(p) of the Clean Water Act [CWA]). The Municipal Storm Water Permitting Program management programs specify what best management practices (BMPs) will be used to address certain program areas. The program areas include public education and outreach; illicit discharge detection and elimination; construction and post-construction; and good housekeeping for municipal operations. In general, medium and large municipalities are required to conduct chemical monitoring, though small municipalities are not.

TECHNICAL CONSIDERATIONS

GLOSSARY

Construction Storm Water Program
Dischargers whose projects disturb 1 or more acres of soil or are part of a larger common plan of development that in total disturbs 1 or more acres, are required to obtain coverage under the General Permit for Discharges of Storm Water Associated with Construction Activity (Construction General Permit, 2009-0009-DWQ).

Industrial Storm Water Program
Discharges associated with 10 broad categories of industrial activities are regulated under the Industrial Storm Water General Permit Order 2014-0057-DWQ (General Industrial Permit), which is an NPDES permit.

Municipal Storm Water Phase I Facilities
The Municipal Storm Water Permits regulate storm water discharges from municipal separate storm sewer systems (MS4s). Under Phase I, which began in 1990, the Regional Water Boards have issued NPDES MS4 permits to permittees serving populations greater than 100,000 people. Many of these permits are issued to a group of co-permittees encompassing an entire metropolitan area. These permits are reissued as the permits expire.

Municipal Storm Water Phase II Facilities
Under Phase II, the State Water Board adopted a General Permit for the Discharge of Storm Water from Small MS4s (WQ Order No. 2013-0001-DWQ) to provide permit coverage for smaller municipalities (10,000 to 100,000 people), including non-traditional small MS4s which are governmental facilities such as military bases, public campuses, prisons and hospital complexes.