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 "L"
La Canada Flintridge
La Crescenta
La Grange
La Habra
La Honda
La Jolla
La Mesa
La Mirada
La Palma
La Puente
La Quinta
La Verne
Ladera Ranch
Lafayette
Laguna Beach
Laguna Hills
Laguna Niguel
Laguna Woods
Lagunitas
Lake Arrowhead
Lake City
Lake Elsinore
Lake Forest
Lake Hughes
Lake Isabella
Lakehead
Lakeport
Lakeshore
Lakeside
Lakewood
Lamont
Lancaster
Landers
Larkspur
Lathrop
Laton
Lawndale
Laytonville
Le Grand
Lebec
Lee Vining
Leggett
Lemon Cove
Lemon Grove
Lemoore
Lewiston
Likely
Lincoln
Linden
Lindsay
Litchfield
Little River
Littlerock
Live Oak
Livermore
Livingston
Llano
Lockeford
Lockwood
Lodi
Loleta
Loma Linda
Loma Mar
Lomita
Lompoc
Lone Pine
Long Barn
Long Beach
Lookout
Loomis
Los Alamitos
Los Alamos
Los Altos
Los Angeles
Los Banos
Los Gatos
Los Molinos
Los Olivos
Los Osos
Lost Hills
Lotus
Lower Lake
Loyalton
Lucerne
Lucerne Valley
Ludlow
Lynwood
Lytle Creek
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.