Is Prunedale, CA tap water safe?
The short answer
7 of the 15 utilities serving Prunedale have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Pond - Derosa Oaks WC, Psmcsd - Vierra Estates WS, Prunedale MWC and 4 more.
Cwsc Salinas, which serves the most people here, has 4 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 42 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.
The water from Cwsc Salinas is moderately hard to very hard depending on the source, 117 to 600 mg/L (6.8 to 35.1 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 Prunedale’s ZIP codes, from EPA’s estimates.
- Open report
Cwsc Salinas
California · serves 114,286 people · about 5,000 in Prunedale
4 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 42 ppb, above EPA’s health benchmark. Hardness: moderately hard to very hard depending on the source, 117 to 600 mg/L (6.8 to 35.1 grains per gallon).
No health-based violations since 2016
- Open report
City of Watsonville
California · serves 65,231 people · about 3,300 in Prunedale
2 results above EPA’s new limit, which takes effect in 2029, 3 results above the health goal and 1 result above EPA’s health benchmark. The worst: PFOA at 6.5 ppt, above EPA’s new limit, which takes effect in 2029. Hardness: very hard, typically 230 mg/L (13.5 grains per gallon).
No health-based violations since 2016
- Open report
Cwsc Oak Hills
California · serves 3,214 people · about 1,100 in Prunedale
1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 28.7 ppb, above EPA’s health benchmark. Hardness: hard to very hard depending on the source, 160 to 300 mg/L (9.4 to 17.5 grains per gallon).
No health-based violations since 2016
- Open report
Aromas Water District
California · serves 2,988 people · about 780 in Prunedale
3 results above the health goal. The worst: Arsenic at 2.2 ppb, above the health goal. Hardness: hard to very hard depending on the source, 144 to 391 mg/L (8.4 to 22.9 grains per gallon).
No health-based violations since 2016
- Open report
Psmcsd - Normco
California · serves 928 people · about 770 in Prunedale
3 results above the health goal. The worst: Arsenic at 2.0 ppb, above the health goal. Hardness: moderately hard, typically 71 mg/L (4.2 grains per gallon).
No health-based violations since 2016
- Open report
Pond - Derosa Oaks WC
California · serves 216 people · nearly all in Prunedale
1 result above the health goal. The worst: Arsenic at 2.3 ppb, above the health goal. Hardness: moderately hard, 92 mg/L (5.4 grains per gallon).
1 health-based violation since 2016
- Open report
Psmcsd - Vierra Estates WS
California · serves 164 people · nearly all in Prunedale
1 result above the legal limit and 1 result above the health goal. The worst: Arsenic at 14.8 ppb, above the legal limit. Hardness: moderately hard, typically 102 mg/L (5.9 grains per gallon).
3 health-based violations since 2016
- Open report
Psmcsd - Pajaro
California · serves 3,500 people · about 280 in Prunedale
3 results above the health goal. The worst: Lead at 1.2 ppb, above the health goal. Hardness: very hard, typically 277 mg/L (16.2 grains per gallon).
No health-based violations since 2016
- Open report
Prunedale MWC
California · serves 277 people · nearly all in Prunedale
1 result above the legal limit. The worst: Arsenic at 23.2 ppb, above the legal limit. Hardness: moderately hard to hard depending on the source, 103 to 131 mg/L (6 to 7.7 grains per gallon).
2 health-based violations since 2016
- Open report
Colonial Oak WC Inc
California · serves 198 people · nearly all in Prunedale
1 result above the legal limit. The worst: Nitrate at 18.9 ppm, above the legal limit. Hardness: moderately hard to hard depending on the source, 92 to 152 mg/L (5.4 to 8.9 grains per gallon).
3 health-based violations since 2016
5 more utilities in Prunedale
By EPA’s estimate, each serves fewer people in Prunedale than those above.
- San Miguel WS #22serves 93 people · nearly all in Prunedale · 1 health-based violation since 2016
- Rolling Hills Rancho WAserves 185 people · nearly all in Prunedale · no health-based violations since 2016
- Moro Rd WS #09serves 210 people · about 180 in Prunedale · 36 health-based violations since 2016
- Rancho Borromeo MWCserves 100 people · nearly all in Prunedale · no health-based violations since 2016
- Cwsc Las Lomasserves 2,132 people · about 170 in Prunedale · 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 Cwsc Salinas’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: Nitrate, 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: Nitrate, Arsenic, Lead
Culligan 10-Cup Pitcher with ZeroWater Technology (ZEROP10)
Pitcher
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
Certified for: Nitrate, Lead
Water testing near Prunedale
The 3 labs California certifies closest to Prunedale, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Monterey County Consolidated Environmental Laboratory
Salinas, CA · about 12 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
CM Analytical, Inc.
Gilroy, CA · about 12 miles
Certified for bacteria
Bracewell Engineering, Inc.
Morgan Hill, CA · about 18 miles
Certified for bacteria, nitrate, minerals and other inorganics
Which ZIP codes are in Prunedale: 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 Prunedale
Other towns in Monterey County with a page of their own.
What to do next
- Read Cwsc Salinas’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