Is Isleton, CA tap water safe?
The short answer
3 of the 5 utilities serving Isleton have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Vieira'S Resort, Inc, B & W Resort Marina and River'S Edge Marina & Resort.
Vieira'S Resort, Inc, which serves the most people here, has 1 result above the limit’s level with no violation recorded. The worst: Arsenic at 22.3 ppb, above the limit’s level, no violation. A health benchmark is a level EPA screens with, not a legal limit.
The water from Vieira'S Resort, Inc is soft to moderately hard depending on the source, 32 to 72 mg/L (1.8 to 4.2 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 Isleton’s ZIP codes, from EPA’s estimates.
- Open report
Vieira'S Resort, Inc
California · serves 150 people · under 100 in Isleton
1 result above the limit’s level with no violation recorded. The worst: Arsenic at 22.3 ppb, above the limit’s level, no violation. Hardness: soft to moderately hard depending on the source, 32 to 72 mg/L (1.8 to 4.2 grains per gallon).
8 health-based violations since 2016
- Open report
Korths Pirates Lair
California · serves 40 people · under 100 in Isleton
1 result above the limit’s level with no violation recorded. The worst: Arsenic at 12.8 ppb, above the limit’s level, no violation. Hardness: very hard, 262 mg/L (15.3 grains per gallon).
No health-based violations since 2016
- Open report
B & W Resort Marina
California · serves 100 people · under 100 in Isleton
1 result above the limit’s level with no violation recorded. The worst: Arsenic at 35 ppb, above the limit’s level, no violation. Hardness: soft to moderately hard depending on the source, 46 to 99 mg/L (2.7 to 5.8 grains per gallon).
6 health-based violations since 2016
- Open report
River'S Edge Marina & Resort
California · serves 150 people · based in Isleton
2 results above the health goal. The worst: Arsenic at 3.6 ppb, above the health goal. Hardness: hard, 165 mg/L (9.6 grains per gallon).
1 health-based violation since 2016
- Open report
Happy Harbor (Sws)
California · serves 60 people · based in Isleton
1 result above the health goal. The worst: Arsenic at 7.3 ppb, above the health goal. Hardness: very hard, 389 mg/L (22.7 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 Vieira'S Resort, Inc’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 Isleton
The 3 labs California certifies closest to Isleton, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Lodi Wine Laboratories
Lodi, CA · about 18 miles
Certified for nitrate, minerals and other inorganics
Precision Enviro-Tech
Stockton, CA · about 19 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
McCampbell Analytical, Inc.
Pittsburg, CA · about 20 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS
ZIP codes in Isleton
Which ZIP codes are in Isleton: 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 Isleton
Other towns in Sacramento County with a page of their own.
What to do next
- Read Vieira'S Resort, Inc’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