Claremont-Pomona Permit

The Cities of Claremont and Pomona are located within the Los Angeles Regional Water Quality Control Board’s (Los Angeles Water Board) geographic area. However, parts of the Cities’ storm drainage systems (also called municipal separate storm sewer systems or MS4s for short) discharge storm water and urban runoff to Reach 3 of the Santa Ana River. The Santa Ana River is within the Santa Ana Regional Water Quality Control Board’s (Santa Ana Water Board) geographic area. Reach 3 of the Santa Ana River begins at Prado dam and extends upstream to the Mission Boulevard bridge. Reach 3 is also known as the Middle Santa Ana River.

The Middle Santa Ana River has a problem with bacteria levels that pose a hazard to recreational users. To reduce bacteria that is carried into the river from various sources, the Santa Ana Water Board established a Total Maximum Daily Load (TMDL) to identify those sources and set deadlines to reduce their discharges of bacteria. One of the sources of bacteria are storm drain systems owned or operated by the cities in the watershed. This includes the MS4s that are owned and operated by the cities of Claremont and Pomona. Pollution from MS4s that are owned or operated by other cities in the Santa Ana Water Board’s geographic area are regulated by other stormwater permits.

Even though Claremont and Pomona are within the Los Angeles Water Board’s geographic area, an agreement was reached that the Santa Ana Water Board would be responsible for regulating bacteria in the MSAR that came from the cities of Claremont and Pomona. So, the Santa Ana Water Board issued a permit for the cities of Claremont and Pomona, Order No. R8-2013-0043, NPDES Permit No. CA8000410 (Permit). This Permit specifically implements the Bacterial Indicator Total Maximum Daily Load (TMDL) for the Middle Santa Ana River (MSAR) watershed.

Now it is time to renew the Permit. The renewal process will include posting the draft permit on this website and a minimum 30-day comment period prior to adoption by the Santa Ana Water Board. The process may include public workshops in person or virtually.

If you are interested in learning more about this project or receiving notices about the availability of the draft permit, comment periods, workshops, and other outreach, please sign up for our mailing list using GovDelivery. Please select the “Region 8 – Stormwater – Claremont-Pomona Bacteria TMDL Permit” topic to receive notifications about this project

If you have any questions or comments, you can reach us at rb8-stormwater.comments@waterboards.ca.gov.

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Email: RB8-stormwater@waterboards.ca.gov

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