Is Guerneville, CA tap water safe?
The short answer
1 of the 3 utilities serving Guerneville has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Armstrong Valley - Cal Water Service (Puc).
Sweetwater Springs CWD - Guerneville, which serves the most people here, has nothing above a health goal in EPA’s and California’s records. That data covers what its report lists, not everything.
The water from Sweetwater Springs CWD - Guerneville is hard, 160 mg/L (9.4 grains per gallon). How California’s water compares.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Guerneville’s ZIP codes, from EPA’s estimates.
- Open report
Sweetwater Springs CWD - Guerneville
California · serves 5,156 people · about 1,400 in Guerneville
Nothing in its records is above a health goal. Hardness: hard, 160 mg/L (9.4 grains per gallon).
No health-based violations since 2016
- Open report
Armstrong Valley - Cal Water Service (Puc)
California · serves 539 people · about 120 in Guerneville
1 result above the action level and 1 result above the health goal. The worst: Copper at 1.4 ppm, above the action level. Hardness: moderately hard, 98 mg/L (5.7 grains per gallon).
No health-based violations since 2016
- Open report
Odd Fellows Recreation Club
California · serves 557 people · under 100 in Guerneville
Nothing in its records is above a health goal. Hardness: moderately hard to very hard depending on the source, 72 to 210 mg/L (4.2 to 12.3 grains per gallon).
No health-based violations since 2016
Water testing near Guerneville
The 3 labs California certifies closest to Guerneville, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
K Prime, LLC.
Santa Rosa, CA · about 11 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, PFAS
Sonoma County Public Health Laboratory
Santa Rosa, CA · about 16 miles
Certified for bacteria
Brelje and Race Laboratories, Inc.
Santa Rosa, CA · about 16 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
Which ZIP codes are in Guerneville: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: California State Water Resources Control Board, ELAP accredited laboratories and their fields of accreditation; distances from the Census 2020 ZIP code tabulation area gazetteer.
Near Guerneville
Other towns in Sonoma County with a page of their own.
What to do next
- Read Sweetwater Springs CWD - Guerneville’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water