Case Study: Stormwater Pretreatment Capture Facility in Southern California

Stormwater Treatment Systems Case Study

Los Cerritos Channel Sub-Basin 4 Stormwater Capture Facility
Long Beach Airport, California, May 2018

Dry weather runoff and first flush stormwater flows pollute a Southern California watershed. Affected cities collaborate on a comprehensive stormwater management solution provided by Jensen Stormwater Systems.

The 17,771-acre Los Cerritos Channel Freshwater Watershed in Southern California showed exceedances of the total maximum daily load (TMDL) limits established by the US Environmental Protection Agency (EPA) for total suspended solids (TSS) and several heavy metals. This urbanized, commercial, and industrial watershed is generating these pollutants in both dry weather runoff and first flush stormwater flows.

Seven cities in the watershed were accountable for resolving an EPA mandate to lower TSS and heavy metals below the TMDL levels. Bellflower, Cerritos, Downey, Lakewood, Long Beach, Paramount, and Signal Hill each needed a solution to manage and monitor water quality in their respective oversite areas.


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