Is Bethel Island, CA tap water safe?
The short answer
2 of the 10 utilities serving Bethel Island have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Sandmound Mutual and Russos Mobile Park.
Pleasantimes Mutual Water Co, which serves the most people here, has 2 results above the health goal. The worst: Arsenic at 3.6 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.
The water from Pleasantimes Mutual Water Co is hard to very hard depending on the source, 134 to 186 mg/L (7.8 to 10.8 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 Bethel Island’s ZIP codes, from EPA’s estimates.
- Open report
Pleasantimes Mutual Water Co
California · serves 644 people · about 450 in Bethel Island
2 results above the health goal. The worst: Arsenic at 3.6 ppb, above the health goal. Hardness: hard to very hard depending on the source, 134 to 186 mg/L (7.8 to 10.8 grains per gallon).
No health-based violations since 2016
- Open report
Willow Mobile Home Park
California · serves 481 people · about 340 in Bethel Island
2 results above the health goal. The worst: Lead at 10 ppb, above the health goal. Hardness: very hard, 226 mg/L (13.2 grains per gallon).
No health-based violations since 2016
- Open report
Anglers Subdivision 4
California · serves 99 people · nearly all in Bethel Island
1 result above the health goal. The worst: Arsenic at 3.0 ppb, above the health goal. Hardness: very hard, typically 493 mg/L (28.8 grains per gallon).
No health-based violations since 2016
- Open report
Bethel Island Estates
California · serves 200 people · about 120 in Bethel Island
1 result above the health goal. The worst: Arsenic at 9.6 ppb, above the health goal. Hardness: very hard, 266 mg/L (15.6 grains per gallon).
No health-based violations since 2016
- Open report
Riverview Water Association
California · serves 230 people · under 100 in Bethel Island
2 results above the health goal. The worst: Arsenic at 5.0 ppb, above the health goal. Hardness: very hard, typically 263 mg/L (15.4 grains per gallon).
No health-based violations since 2016
- Open report
Sandmound Mutual
California · serves 100 people · under 100 in Bethel Island
1 result above the action level and 1 result above the limit’s level with no violation recorded. The worst: Copper at 1.5 ppm, above the action level. Hardness: very hard, typically 305 mg/L (17.8 grains per gallon).
1 health-based violation since 2016
- Open report
Russos Mobile Park
California · serves 110 people · under 100 in Bethel Island
Nothing in its records is above a health goal. Hardness: hard, 165 mg/L (9.6 grains per gallon).
1 health-based violation since 2016
- Open report
Angler S Ranch #3
California · serves 60 people · under 100 in Bethel Island
1 result above the health goal. The worst: Arsenic at 8.0 ppb, above the health goal. Hardness: very hard, 293 mg/L (17.1 grains per gallon).
No health-based violations since 2016
- Open report
Farrar Park Property Owners
California · serves 140 people · under 100 in Bethel Island
1 result above the limit’s level with no violation recorded. The worst: Arsenic at 11 ppb, above the limit’s level, no violation. Hardness: hard, 150 mg/L (8.8 grains per gallon).
No health-based violations since 2016
- Open report
Bethel Island Mutual Water Co
California · serves 123 people · under 100 in Bethel Island
1 result above the health goal. The worst: Arsenic at 7.9 ppb, above the health goal. Hardness: moderately hard, 101 mg/L (5.9 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 Pleasantimes Mutual Water Co’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 Bethel Island
The 3 labs California certifies closest to Bethel Island, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
McCampbell Analytical, Inc.
Pittsburg, CA · about 15 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS
Precision Enviro-Tech
Stockton, CA · about 20 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
San Joaquin County Public Health Laboratory
Stockton, CA · about 21 miles
Certified for bacteria
ZIP codes in Bethel Island
Which ZIP codes are in Bethel Island: 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 Bethel Island
Other towns in Contra Costa County with a page of their own.
What to do next
- Read Pleasantimes Mutual Water Co’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