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In page Pollution in California:

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California waste water treatment plants release large amounts of N (Nitrogen) in the form of NH4+ (Ammonium). This has been shown to reduce naturally occurring spring and summer phytoplankton blooms. These creatures make up the primary source of food. With the lack of dependable Phytoplankton blooms a bottom-up effect occurs. Decreased biodiversity and overall number of species located in the water of California over time can be seen due to the large amounts of NH4+. The main source of this NH4+ can be traced to the Sacramento Regional Water Treatment Plant (SRWTP). SRWTP releases 90% of the NH4+ seen in the San Francisco Estuary (SFE)[citation needed]