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The California State Water Resources Control Board (State Water Board) is proposing amendments to the existing Storm Water Industrial General Permit (IGP). The IGP amendment will incorporate requirements for facilities to comply with Total Maximum Daily Loads (TMDLs) and provide alternative compliance options. The changes will include updating required test methods to sufficiently sensitive test methods based on U. S. EPA requirements. Facilities required to comply with TMDLs will have additional monitoring and sampling requirements, as well as new effluent limitations, to track for compliance. The areas potentially affected by the new TMDL requirements include the San Francisco, Los Angeles, Santa Ana, and San Diego Regional Water Board jurisdictions. Some of the pollutants incorporated in the TMDL requirements include metals, bacteria, nutrients, toxics, pesticides, trash and debris, salts, and sediment. Affected facilities will have to comply with additional TMDL-related numeric action levels (TNALs) or numeric effluent limits (NELs). Compliance actions for TNALs/NELs include taking storm water samples, completing the required testing, and comparing results to permit limits. The State Water Board will require facilities to self-identify and report compliance with these new TMDL requirements. The proposed amendments will be going through public comment and refinement over the next few months and are expected to be adopted in late 2018.

Trinity will be hosting a complimentary webinar on March 6, 2018, to discuss these upcoming storm water changes and how facilities can comply. To register for this free webinar, click here. For more information regarding compliance with the proposed IGP program updates, please contact our Irvine office at (949) 567-9880 or visit the Water Board's website.