National Pollutant Discharge Elimination System (NPDES) Pesticides - Weed Control

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The State Water Resources Control Board adopted the Statewide General National Pollutant Discharge Elimination System (NPDES) Permit for Residual Aquatic Pesticide Discharges to Waters of the United States from Algae and Aquatic Weed Control Applications, Water Quality Order 2013-0002-DWQ, for the reissuance of General NPDES Permit CAG990005 in June 2013. Order 2013-0002-DWQ became effective on December 1, 2013.

Except for discharges on tribal lands that are regulated by a federal permit, this General Permit covers the point source discharge to waters of the United States of residues resulting from pesticide applications using products containing 2,4-D, acrolein, copper, diquat, endothall, flumioxazin, fluridone, glyphosate, hydrogen peroxide, imazamox, imazapyr, penoxsulam, peroxyacetic acid, sodium carbonate peroxyhydrate, and triclopyr-based algaecides and aquatic herbicides, and adjuvants containing ingredients represented by the surrogate nonylphenol.

This General Permit covers only discharges of algaecides, and aquatic herbicides that are currently registered for use in California, or that become registered for use and contain the above-listed active ingredients and ingredients represented by the surrogate of nonylphenol.

To apply for coverage under Order 2013-0002-DWQ, submit Items 1-3 to the address shown in Item 4 below:

  1. A Notice of Intent shown as Attachment E of Order 2013-0002-DWQ, signed in accordance with the signatory requirements of the Standard Provisions in Attachment B;
  2. An application fee of $2268 (New fee amount for FY18/19.) A fee is required only for new dischargers. Dischargers enrolled under this General Permit are billed annually thereafter;
  3. An Aquatic Pesticide Application Plan (APAP). Dischargers that were enrolled in Order 2004-0009-DWQ may not have to submit a new APAP, but will have to amend their existing APAP to comply with requirements of the Order 2013-0002-DWQ. See Section VIII.C, of the Order 2013-0002-DWQ for details; and
  4. Mailing Address: State Water Resources Control Board, Division of Water Quality, ATTN: NPDES Wastewater Unit, 1001 I Street, 15th Floor, Sacramento, CA 95814

Man in boat spraying pesticides on weeds.

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  |  Additional Information


The State Water Board is proposing to amend Order 2013-0002-DWQ (as amended by Order 2014-0078-DWQ, 2015-0029-DWQ, 2016-0074-EXEC, and 2017-0015-EXEC) to add Chowchilla Water District to the State Implementation Policy exception list in Attachment G of the Aquatic Weed Control permit. The Draft Order, Public Notice, and State Implementation Policy Exception CEQA documentation are available for review in the following links:


Sixth Circuit Court Ruling on National Cotton Council of America v. U.S. EPA (553 F.3d 927 (6th Cir., 2009))
On January 11, 2009, the Sixth Circuit Court of Appeals ruled that pesticide applications at, near, or over water must be covered by an NPDES permit. Thus, algaecide and aquatic herbicide applications in California must be covered by the Aquatic Weed Control Permit currently being implemented under State Water Board Order 2013-0002-DWQ.

State Implementation Policy Exception for Acrolein and Copper
Section 5.3 of the State Water Board Policy for Implementation of Toxics Standards for Inland Surface Waters, Enclosed Bays, and Estuaries of California (Policy) allows exceptions to meeting priority pollutant criteria/objectives if the State Water Board or Regional Water Quality Control Boards determine the exception to be necessary to implement control measures either:

  1. for resource or pest management (i.e., vector or weed control, pest eradication, or fishery management) conducted by public entities or mutual water companies;
  2. for drinking water conducted to fulfill statutory requirements under the federal Safe Drinking Water Act or the California Health and Safety Code.

Dischargers do not need a Policy exception to get covered under State Water Board Order 2013-0002-DWQ. However, since the Order allows an exception to receiving water limitations for acrolein and copper, which are the only two priority pollutants regulated by the Order, dischargers may apply for an exception at their discretion. To get an exception, dischargers must submit the following information to the address shown in Item 4 above:

  1. A detailed description of the proposed action, including the proposed method of completing the action;
  2. A time schedule;
  3. A discharge and receiving water quality monitoring plan (before project initiation, during the project, and after project completion, with the appropriate quality assurance and quality control procedures);
  4. Documentation of compliance with the California Environmental Quality Act;
  5. Contingency plans;
  6. Identification of alternate water supply (if needed); and
  7. Residual waste disposal plans.

Upon completion of the project, the discharger shall provide certification by a qualified biologist that the receiving water beneficial uses have been restored.

Current Permit

  • Expired Permit: Water Quality Order 2004-0009-DWQ (expired 11/30/2013)
  • Fees

    • Fee Schedule (NPDES Permit Fees)
      • Vector Control - See Section 2200(b)(6) for the permit term fee.
      • Other Pesticides Permits - See Category 3 of Section 2200(b)(9) for the base annual fee.
    • 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.

    Ex Parte Disclosure Requirements for Pending General Orders

    • Any pending Board item is subject to the ex parte communication disclosure requirements of Water Code section 13287. Any communications between interested persons and board members (other than at a noticed board meeting or submitted as a comment letter in compliance with the public notice) must be disclosed by the interested person within seven days of the communication. Sample disclosure forms are available.

      Beginning 14 days before scheduled adoption by the Board, ex parte communications between interested persons and board members concerning any Board item are prohibited.

    Notice of Intents (NOI), Aquatic Pesticide Application Plans (APAP), and Notice of Terminations (NOT)

    Applicant/Discharger Notice of Intent (NOI) / Aquatic Pesticide Application Plan (APAP) Comments Due Revised Aquatic Pesticide Application Plan (APAP) Notice of Termination (NOT)
    San Diego County Water Authority NOI & APAP 01/12/15    
    Woodbridge Mutual Water and Property Owners Corporation NOI & APAP 01/19/15    
    Solano County Water Agency NOI & APAP 01/19/15 NOI & APAP  
    Coastal San Luis Resource Conservation District NOI & APAP 02/06/15    
    Orland Unit Water User's Association NOI & APAP 02/06/15    
    County of Los Angeles Department of Parks and Recreation NOI & APAP 02/13/15    
    Stone Lake National Wildlife Refuge NOI & APAP 02/27/15    
    Santa Fe Irrigation District NOI & APAP 02/27/15    
    California Department of Water Resources NOI & APAP 03/09/15 NOI & APAP  
    Riverside County Flood Control and Water Conservation District NOI & APAP 03/09/15 NOI & APAP  
    Big Bear Municipal Water District NOI & APAP 04/06/15 NOI & APAP  
    RD1500/Sutter Mutual Water Company NOI & APAP 05/21/15    
    Reclamation District 1001 NOI & APAP 05/21/15    
    Riverview Golf and Country Club NOI & APAP 05/21/15    
    Fresno Irrigation District NOI & APAP 05/21/15 NOI & APAP  
    Anderson Cottonwood Irrigation District NOI & APAP 05/26/15    
    Clean Lakes - Sacramento-San Joaquin Delta NOI & APAP 07/06/15    
    City of Sacramento, Department of Utilities NOI & APAP 08/14/15 NOI & APAP  
    Riverside Public Utilities NOI & APAP 08/20/15    
    Center for Natural Lands Management NOI & APAP 09/04/15    
    City of San Diego Park and Recreation Department, Open Space Division NOI & APAP 09/14/15    
    Land Conservancy of San Luis Obispo County NOI & APAP 09/15/15    
    City of San Jose – Dept. of Transportation NOI & APAP 04/29/16    
    Cameron Park Community Services District NOI & APAP 05/13/16    
    Sonoma Development Center - Plant Operations NOI & APAP 05/13/16    
    Madera Irrigation District NOI & APAP 06/06/16 NOI & APAP  
    Madera-Chowchilla Water & Power Authority NOI & APAP 06/06/16    
    California Department of Water Resources NOI & APAP 06/20/16 NOI & APAP  
    City of Long Beach, Department of Parks, Recreation and Marine NOI & APAP 07/11/16    
    Los Angeles Department of Water and Power NOI & APAP 08/15/16 NOI & APAP  
    Fresno Metropolitan Flood Control District NOI & APAP 09/02/16 NOI & APAP  
    Sacramento County, Department of Water Resources NOI & APAP 09/05/16    
    Turlock Irrigation District NOI & APAP 09/26/16 NOI &APAP  
    Grassland Water District NOI & APAP 09/26/16    
    Riverside-Corona Resource Conservation District NOI & APAP 09/26/16    
    Placer County Water Agency NOI & APAP 09/30/16 NOI &APAP  
    East Bay Municipal Utility District NOI & APAP 12/05/16 NOI & APAP  
    City of Eureka, Parks & Recreation Department NOI & APAP 05/26/17    
    Teichert Land Company NOI & APAP 06/19/17 NOI & APAP  
    City of Redwood City, Public Works Division NOI & APAP 06/22/17 NOI & APAP  
    Central California Irrigation District NOI & APAP 08/07/17 NOI & APAP  
    Tahoe Keys - Property Owners Association NOI & APAP 08/31/17    
    City of Napa Water Division   05/20/18 NOI & APAP  
    Willow Creek Ranch Pond Aquatic Plant Management NOI & APAP 05/20/18    
    Oakdale Irrigation District   05/20/18 NOI & APAP  
    Citizens Development Corporation NOI & APAP 05/20/18    
    Firebaugh Canal Water District NOI & APAP 05/20/18    
    Marine Corps Air Station Miramar NOI & APAP 05/27/18    
    Chowchilla Water District NOI & APAP 06/16/18    
    Rancho Murieta Community Service District NOI & APAP 06/16/18    
    Waterworks Industries Inc. NOI & APAP 08/02/18 NOI & APAP  
    Marin Municipal Water District NOI& APAP 08/03/18 NOI & APAP  
    San Luis & Delta-Mendota Water Authority NOI & APAP 09/15/18    
    Los Angeles Department of Water and Power NOI & APAP 09/16/18 NOI & APAP  
    South Sutter Water District   09/15/18 NOI & APAP  
    Travis Air Force Base   12/06/18 NOI & APAP  
    Patterson Irrigation District NOI & APAP 02/25/19    
    County of San Luis Obispo, Department of Public Works   04/30/19 NOI & APAP  
    Waterworks Industries NOI & APAP 04/30/19 NOI & APAP  
    Beale Air Force Base   05/03/19 NOI & APAP   
    City of Atascadero   05/13/19 NOI & APAP  
    Montecito Water District NOI & APAP 06/20/19    
    Waterworks Aquatic Management – Treelake Village NOI & APAP 06/27/19 NOI & APAP  
    Helix Water District   06/29/19 NOI & APAP  
    Department of Water Resources, State Water Project Mitigation and Restoration Branch NOI & APAP 07/12/19    
    Klamath Basin National Wildlife Refuge Complex NOI & APAP 07/14/19    
    California Department of Parks and Recreation, Division of Boating and Waterways – Water Hyacinth Control Project   08/09/19 NOI & APAP  
    California Department of Parks and Recreation, Division of Boating and Waterways – Egeria Densa Control Program   08/09/19 NOI & APAP  
    San Joaquin Area Flood Control Agency NOI & APAP 08/29/19    
    San Diego National Wildlife Refuge NOI & APAP 09/30/19    
    Elsinore Valley Municipal Water District NOI & APAP 11/18/19    
    City of San Jose NOI & APAP 03/20/20    
    California Department of Fish and Wildlife, Wildlife Branch NOI & APAP 04/20/20    
    Lake of the Pines Association NOI & APAP 05/07/20    
    California Park Association   05/10/20 NOI & APAP  
    Firebaugh Canal Water District   05/24/20 NOI & APAP  
    City of Alameda, Public Works Department   05/30/20 NOI & APAP  
    Yolo County Resource Conservation District NOI & APAP 06/04/20    
    Vandenberg Air Force Base NOI & APAP 06/22/20    
    Gulf South Research Corporation NOI & APAP 11/30/20    
    West Stanislaus Irrigation District   12/18/20 APAP  
    James Irrigation District   02/19/21 NOI & APAP  
    City of San Mateo   04/19021 NOI & APAP  
    Indermill Aquatics NOI & APAP


    Vista Irrigation District NOI & APAP 05/10/21    
    City of Santa Cruz 05/12/21 NOI & APAP
    Citizens Development Corporation 6/03/2021 NOI & APAP
    Waterworks Industries Inc 6/21/2021 NOI & APAP
    Woodridge Mutual Water and Property Owners Corp NOI & APAP 7/12/2021  

    Comments may be submitted via email to: Gurgagn Chand, WRCE at or by mail to: Gurgagn Chand, WRCE at State Water Resources Control Board, Division of Water Quality, 1001 I St, 15th Floor, Sacramento, CA 95814. Comments received after Noon on the comment due date will not be considered.

    Additional Information

    Weed Control permit presentation for EPA Region 9 Harmful Algal Blooms Meeting (4/27/2017):

    Permitting Requirements for Algae and Aquatic Weed Control Presentation Slides