From the USGS:
In recent years, it has been suggested that forms of nutrients and their associated effects may cause changes in productivity that affect food webs in the Sacramento–San Joaquin Delta (Delta). Specifically, the potential effects on the ecosystem from the nutrient ammonium, found in wastewater discharge, is a major concern.
The presence of ammonium in the Delta has prompted the California Central Valley Water Quality Control Board to issue new discharge requirements for one of the most significant dischargers of wastewater to the Delta: the Sacramento Regional County Sanitation District’s treatment facility.
Click here to read this article from the USGS.
