Is Boulder Creek, CA tap water safe?
The short answer
3 of the 5 utilities serving Boulder Creek have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: San Lorenzo Valley Water Dist, Forest Springs and Bracken Brae Country Club.
San Lorenzo Valley Water Dist, which serves the most people here, has 2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 32 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.
The water from San Lorenzo Valley Water Dist is soft to very hard depending on the source, 46 to 470 mg/L (2.7 to 27.5 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 Boulder Creek’s ZIP codes, from EPA’s estimates.
- Open report
San Lorenzo Valley Water Dist
California · serves 21,513 people · about 1,000 in Boulder Creek
2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 32 ppb, above EPA’s health benchmark. Hardness: soft to very hard depending on the source, 46 to 470 mg/L (2.7 to 27.5 grains per gallon).
1 health-based violation since 2016
- Open report
Big Basin Water Company
California · serves 1,120 people · about 200 in Boulder Creek
2 results above the health goal. The worst: Lead at 12 ppb, above the health goal. Hardness: soft to hard depending on the source, 35 to 160 mg/L (2 to 9.4 grains per gallon).
No health-based violations since 2016
- Open report
Forest Springs
California · serves 385 people · under 100 in Boulder Creek
2 results above the health goal. The worst: Lead at 5.9 ppb, above the health goal. Hardness: moderately hard, 120 mg/L (7 grains per gallon).
22 health-based violations since 2016
- Open report
Bracken Brae Country Club
California · serves 52 people · under 100 in Boulder Creek
2 results above the health goal. The worst: Arsenic at 1.8 ppb, above the health goal.
1 health-based violation since 2016
- Open report
Ridgeview Estates MWC
California · serves 50 people · under 100 in Boulder Creek
Nothing in its records is above a health goal. Hardness: very hard, 400 mg/L (23.4 grains per gallon).
No health-based violations since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in San Lorenzo Valley Water Dist’s water, which serves the most people here. Another utility’s report names what handles its own results.
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Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic, Lead
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic, Lead
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic, Lead
Water testing near Boulder Creek
The 3 labs California certifies closest to Boulder Creek, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Santa Cruz County - Health Services Agency - Environmental Health
Santa Cruz, CA · about 14 miles
Certified for bacteria
Torrent Laboratory, Inc
Milpitas, CA · about 22 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS
AEMTEK, Inc
Fremont, CA · about 25 miles
Certified for bacteria, minerals and other inorganics
ZIP codes in Boulder Creek
Which ZIP codes are in Boulder Creek: 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 Boulder Creek
Other towns in Santa Cruz County with a page of their own.
What to do next
- Read San Lorenzo Valley Water Dist’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About LithiumWhat it does to health, where it comes from, and the certification claim that addresses it.About Lithium
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water