Is Pescadero, CA tap water safe?
The short answer
3 of the 5 utilities serving Pescadero have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Bianchi Flowers Inc, Marchi Central Farm and Puente Housing Solutions.
Oku Incorporated, which serves the most people here, has 2 results above the health goal. The worst: Arsenic at 7.4 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.
The water from Oku Incorporated is hard, typically 137 mg/L (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 Pescadero’s ZIP codes, from EPA’s estimates.
- Open report
Oku Incorporated
California · serves 35 people · under 100 in Pescadero
2 results above the health goal. The worst: Arsenic at 7.4 ppb, above the health goal. Hardness: hard, typically 137 mg/L (8 grains per gallon).
No health-based violations since 2016
- Open report
Bianchi Flowers Inc
California · serves 65 people · under 100 in Pescadero
1 result above the limit’s level with no violation recorded. The worst: Total trihalomethanes (TTHM) at 200 ppb, above the limit’s level, no violation. Hardness: moderately hard, 106 mg/L (6.2 grains per gallon).
1 health-based violation since 2016
- Open report
Marchi Central Farm
California · serves 30 people · under 100 in Pescadero
1 result above the health goal. The worst: Arsenic at 9.2 ppb, above the health goal. Hardness: hard, 179 mg/L (10.5 grains per gallon).
1 health-based violation since 2016
- Open report
Butano Canyon Mutual
California · serves 150 people · under 100 in Pescadero
2 results above the health goal. The worst: Arsenic at 2.0 ppb, above the health goal. Hardness: hard, typically 160 mg/L (9.3 grains per gallon).
No health-based violations since 2016
- Open report
Puente Housing Solutions
California · serves 28 people · based in Pescadero
1 result above the health goal. The worst: Arsenic at 2.0 ppb, above the health goal. Hardness: very hard, 484 mg/L (28.3 grains per gallon).
1 health-based violation since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in Oku Incorporated’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
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
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
Water testing near Pescadero
The 3 labs California certifies closest to Pescadero, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
San Mateo County Public Health Laboratory
San Mateo, CA · about 20 miles
Certified for bacteria
Santa Cruz County - Health Services Agency - Environmental Health
Santa Cruz, CA · about 23 miles
Certified for bacteria
Eurofins Built Environment Testing West-Burlingame
Burlingame, CA · about 24 miles
Certified for bacteria
ZIP codes in Pescadero
Which ZIP codes are in Pescadero: 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 Pescadero
Other towns in San Mateo County with a page of their own.
What to do next
- Read Oku Incorporated’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Filters for ArsenicRanked by certification and what they cost over five years.The best reverse osmosis systems, ranked
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water