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 "G"
Galt
Garberville
Garden Grove
Garden Valley
Gardena
Gasquet
Gazelle
Georgetown
Gerber
Geyserville
Gilroy
Glen Ellen
Glencoe
Glendale
Glendora
Glenhaven
Glenn
Glennville
Gold Run
Goleta
Gonzales
Goodyears Bar
Goshen
Granada Hills
Grand Terrace
Granite Bay
Grass Valley
Graton
Green Valley Lake
Greenbrae
Greenfield
Greenview
Greenville
Greenwood
Grenada
Gridley
Grimes
Grizzly Flats
Groveland
Grover Beach
Guadalupe
Gualala
Guatay
Guerneville
Guinda
Gustine
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.