Body A TMDL (Total Maximum Daily Load) is defined in federal regulations as “the sum of the individual waste load allocations for point sources and load allocations for nonpoint sources and natural background such that the capacity of the waterbody to assimilate pollutants (the Loading Capacity) is not exceeded.” In other...

Body The Unincorporated Orange County Stormwater Program works to keep pollution out of our flood control channels, creeks, rivers and ocean. The County is regulated by two separate Municipal Stormwater Permits (MS4), issued by the Santa Ana and San Diego Regional Water Quality Control Boards. The following plans and reports provide...

Body The Santa Ana Region Monitoring Plan fulfills the requirements of Phase I MS4 Permit issued by the Santa Ana RWQCB. Maps of the Santa Ana Region monitoring sites is provided in the link below: SAR dry weather monitoring sites picture_as_pdf SAR estuary picture_as_pdf SAR inland bacteria picture_as_pdf SAR mass emissions...

Body In a presentation at the California Stormwater Quality Association (CASQA) quarterly meeting on July 15, 2021, the OC Stormwater Program shared how data from a number of sources is enabling the measurement of dry weather bacteria load reduction as a result of structural and non-structural (source control) strategies in South...