California Water Quality Directory
Find detailed information about water quality in cities and ZIP codes across California. Discover which contaminants might be present and understand how they compare to EPA and recommended limits.
Cities starting with "A"
Acampo
Acton
Adelanto
Adin
Agoura Hills
Aguanga
Ahwahnee
Alameda
Alamo
Albany
Albion
Alderpoint
Alhambra
Aliso Viejo
Alleghany
Alpaugh
Alpine
Alta
Altadena
Altaville
Alturas
Alviso
Amador City
Amboy
American Canyon
Anaheim
Anderson
Angels Camp
Angelus Oaks
Angwin
Annapolis
Antelope
Antioch
Anza
Apple Valley
Applegate
Aptos
Arbuckle
Arcadia
Arcata
Armona
Arnold
Aromas
Arroyo Grande
Artesia
Artois
Arvin
Atascadero
Atherton
Atwater
Auberry
Auburn
Avalon
Avenal
Avery
Avila Beach
Azusa
About Water Quality
Water quality is a measure of the suitability of water for a particular use based on selected physical, chemical, and biological characteristics. In California, water quality can vary significantly by location, affected by factors such as:
Understanding Contaminants
Water contaminants include a wide range of substances from natural minerals to industrial chemicals. Some have health implications, while others affect taste, odor, or appearance of water.
EPA Standards
The Environmental Protection Agency (EPA) sets legal limits for contaminants in drinking water. These standards protect public health by limiting the levels of contaminants allowed.
Health Guidelines
Beyond EPA limits, there are often stricter health-based guidelines recommended by scientists and health organizations for optimal water quality.
Common Contaminants
Common water contaminants in California include arsenic, lead, nitrates, bacteria, pesticides, and industrial chemicals that can vary by region.