People, farmers, industry and the environment in California depend on clean water to survive.
Surface waters are threatened by a host of pollutants, such as bacteria, trash and agricultural runoff. Groundwater sources in California can be contaminated by nitrates and industrial chemicals.[See also How is Drinking Water Treated?]
Perhaps the greatest threat to surface water is nonpoint sources of pollution, such as runoff from agricultural fields and abandoned mines, and stormwater runoff from city streets and construction sites.
Stormwater is typically not treated before it is discharged, so it can contain a variety of contaminants such as pesticides, nitrates from fertilizers, pathogens from animal waste, and automotive and industrial chemicals. Stormwater flows to rivers, bays and the ocean.
Microplastics – plastic debris measuring less than 5 millimeters – are an increasing water quality concern. Entering the water as industrial microbeads or as larger plastic litter that degrade into small pellets, microplastics come from a variety of consumer products.
Microbeads are used as exfoliating agents in cosmetic washes and large-scale cleaning processes. Microplastics are used pharmaceutically for efficient drug delivery and by textile companies to create artificial fibers. Part of their appeal to hygienic and medical interests is their tendency to absorb surrounding chemicals and later release them. This quality makes microplastics ideal as small commercial sponges, but especially dangerous as water contaminants, potentially carrying harmful chemicals through the food chain as they are ingested.
Water Quality in California
Water quality in California is regulated by several state agencies, including the State Water Resources Control Board (State Water Board) and its nine regional boards – North Coast, San Francisco Bay, Central Coast, Los Angeles, Central Valley, Lahontan, Colorado River Basin, Santa Ana and San Diego.
The State Water Board enforces clean water laws and administers the Clean Water Grant Program, which funds construction of wastewater treatment facilities. The State Water Board also issues general permits for municipalities and construction sites that try to prevent contaminants from those sources from entering municipal storm sewers.
The State Water Board’s updated Bay-Delta Water Quality Control Plan for the Lower San Joaquin River and Southern Delta is based on the premise of increased flows to improve water quality, but allows for reduced river flows on tributaries where stakeholders have reached voluntary agreements to pursue a combination of flow and non-flow measures that improve environmental conditions.
Drinking Water Quality
Drinking water standards and regulations are developed by federal and state agencies to protect public health. The federal Safe Drinking Water Act (SDWA) regulates drinking water quality on the national level. Due to the stringent drinking water quality standards in California, the U.S. Environmental Protection Agency allows the state to administer the SDWA.
In California, not all communities have access to safe drinking water. Many disadvantaged communities in isolated areas and in urban parts of the state do not have access to safe drinking water.
With strict and increasing regulations on water quality, high costs of water system maintenance or lack of technical knowledge to apply for grant funding, many regions are at a loss in making substantial water quality and infrastructure improvements.