Is St. Helena, CA tap water safe?
The short answer
1 of the 3 utilities serving St. Helena has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: City of St. Helena.
City of St. Helena, which serves the most people here, has 1 result above the legal limit and 1 result above EPA’s health benchmark. The worst: Haloacetic acids (HAA5) at 74.3 ppb, above the legal limit.
The water from City of St. Helena is soft to moderately hard depending on the source, 23 to 116 mg/L (1.3 to 6.8 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 St. Helena’s ZIP codes, from EPA’s estimates.
- Open report
City of St. Helena
California · serves 5,386 people · about 230 in St. Helena
1 result above the legal limit and 1 result above EPA’s health benchmark. The worst: Haloacetic acids (HAA5) at 74.3 ppb, above the legal limit. Hardness: soft to moderately hard depending on the source, 23 to 116 mg/L (1.3 to 6.8 grains per gallon).
11 health-based violations since 2016
- Open report
Adventist Health - St. Helena Hospital
California · serves 617 people · under 100 in St. Helena
1 result above the health goal. The worst: Arsenic at 9.5 ppb, above the health goal. Hardness: soft, typically 42 mg/L (2.5 grains per gallon).
No health-based violations since 2016
- Open report
Vailima Estates Mutual Water
California · serves 25 people · under 100 in St. Helena
1 result above the health goal. The worst: Arsenic at 4.1 ppb, above the health goal. Hardness: soft, typically 51 mg/L (3 grains per gallon).
No health-based violations since 2016
Water testing near St. Helena
The 3 labs California certifies closest to St. Helena, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Sonoma County Public Health Laboratory
Santa Rosa, CA · about 16 miles
Certified for bacteria
Brelje and Race Laboratories, Inc.
Santa Rosa, CA · about 17 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
K Prime, LLC.
Santa Rosa, CA · about 20 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, PFAS
ZIP codes in St. Helena
Which ZIP codes are in St. Helena: 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 St. Helena
Other towns in Napa County with a page of their own.
What to do next
- Read City of St. Helena’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About Haloacetic acids (HAA5)What it does to health, where it comes from, and the certification claim that addresses it.About Haloacetic acids (HAA5)
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water