County of SonomaCounty of Sonoma Department of Health Services  
Sonoma Coast

Water Quality & Private Wells

 

There are many ways drinking water may become contaminated. Contamination may result from biological (bacteria, viruses, etc.) or from chemical sources. Chemical contaminations can occur from natural sources, such as arsenic leaching from rock formations, or can result from human activities, such as agricultural or industrial operations, or from improper chemical disposal at home.

Private well water is not regulated by any government agency and it is the responsibility of the individual property owner to ensure that their drinking water supply is safe by having the well water tested by a state certified laboratory. Test results from private wells can be compared to the public water system drinking water standards established by the State of California. Landlords are required to provide potable water to their tenants.

Public water systems are regulated by county, state, or federal government, usually depending on the number of connections the water system serves. Public water systems are required to provide to their customers, at least once a year, a notice of water quality. While many states have adopted the safe drinking water standards of the federal government (United States Environmental Protection Agency-USEPA), the State of California has adopted its own regulatory safe water standards for public water systems that are at least as restrictive as those of the USEPA.

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Links:

What You Need To Know About Water Quality in Your Well

WELLness - A guide to understanding water quality in your well

Drinking Water From Household Wells

List of Local State Certified Water Testing Laboratories

How to Disinfect Your Well

Bacteriological Water Testing - Public Health Lab

Public Health Goals (PHG) for public drinking water systems

Maximum Contaminant Levels (MCL) for public drinking water systems

CA Certified Water Treatment Devices

USEPA - Groundwater and Safe Drinking Water Information

Geotracker information database of regulated contaminated sites

Chemical/Health Information Sheets

USEPA - Index of Water Subjects

 

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