National Pollutant Discharge Elimination System (NPDES)
Aquatic Animal Invasive Species Control
The Aquatic Animal Invasive Species Control Permit covers the point source discharge of pesticide residues to waters of the U.S. resulting from direct aquatic pesticide applications using pesticides currently registered by the California Department of Pesticide Regulation for the control of aquatic animal invasive species.
The Aquatic Animal Invasive Species Control Permit does not apply to vessels covered by the U.S. EPA's NPDES Vessel General Permit for Discharges Incidental to the Normal Operation of Vessels. To learn more about vessel discharges, including the U.S. EPA's Vessel General Permit, please go to the Vessel General Permits/Small Vessel General Permit webpage.
Current Permit
- Statewide NPDES Permit No. CAG 990006, effective 6/15/2016 (Unofficial copy as adopted on 03/01/2016)
Announcements
The State Water Board’s Executive Director is proposing to amend Water Quality Order 2016-0041-DWQ to add the Casitas Municipal Water District to Attachment G (List of Public Agencies and Mutual Water Companies Granted an Exception Pursuant to State Water Resources Control Board Policy for Implementation of Toxics Standards for Inland Surface Waters, Enclosed Bays, and Estuaries of California) of the Aquatic Animal Invasive Species Control Permit.
The State Water Board’s Executive Director will only accept written comments regarding the proposed addition of the Casitas Water District to Attachment G of the Aquatic Animal Invasive Species Control Permit. Written comments must be received no later than Tuesday, February 10, 2026 at 12:00 p.m. (noon).
- Notice of Opportunity for Public Comments
- Aviso de Oportunidad para Comentario
- Draft Order 2026-XXXX-EXEC Amending Water Quality Order 2016-0041-DWQ
- Casitas Municipal Water District CEQA – Initial Study and Mitigated Negative Declaration
Fees
- Water Quality Fee Schedule (NPDES Permit Fees)
Please Note: The California Water Code requires the State Water Board to adjust the fees each fiscal year to conform with the revenue levels set forth in the California Budget Act. Thus, the fees could change every year.
Notice of Intents and Aquatic Pesticide Application Plans
| Applicant/Discharger | Notice of Intent/Aquatic Pesticide Application Plan | Comments Due | Revised Pesticide Application Plan |
|---|---|---|---|
| California Department of Water Resources | NOI & APAP | 01/13/2025 | |
| Contra Costa Water District | NOI & APAP | 02/13/2025 | |
| Casitas Municipal Water District | NOI APAP |
08/08/2025 |
Contact
DWQ Pesticides NPDES
DWQ-PesticidesNPDES@Waterboards.ca.gov
