California Stormwater-General regulations & environmental compliance analysis

California Stormwater-General: What you need to know

Governing Law and Regulations

Stormwater Enforcement Act of 1998, California Water Code (CWC) 13399.25 to 13399.43

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Monitoring requirements: CWC 13383.5(c)

Regulatory Agencies

California Regional Water Quality Control Boards (RWQCBs)

California Environmental Protection Agency (Cal/EPA) State Water Resources Control Board (SWRCB) Division of Water Quality Stormwater Section

California Department of Transportation (Caltrans)

U.S. Environmental Protection Agency (EPA) Region 9

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. California is authorized by the U.S. Environmental Protection Agency (EPA) to administer stormwater permits under the National Pollutant Discharge Elimination System (NPDES) permit program. The state generally follows the federal permitting regulations and has given authority to regional water boards to administer stormwater permits. See the national section STORMWATER - GENERAL for more information on the federal requirements.

California is authorized to issue individual and general permits for discharges associated with industrial facilities, construction activities, and municipal separate storm sewer systems (MS4s). See the state sections STORMWATER - INDUSTRIAL FACILITIES, STORMWATER - CONSTRUCTION ACTIVITIES, and STORMWATER - MUNICIPALITIES for more information on specific types of stormwater discharge regulation.

California rules include stricter monitoring requirements for certain stormwater dischargers and more stringent definitions of regulated stormwater discharges. Stormwater runoff from large impervious surfaces such as parking lots are considered a point source subject ...


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