Is Concow, CA tap water safe?
The short answer
2 of the 3 utilities serving Concow have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Thermalito Water & Sewer Dist and Foothills Manufactured Home Communuty.
Thermalito Water & Sewer Dist, which serves the most people here, has 1 result above the legal limit, 1 result above EPA’s new limit, which takes effect in 2029, 1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Haloacetic acids (HAA5) at 47.5 ppb, above the legal limit.
The water from Thermalito Water & Sewer Dist is soft to moderately hard depending on the source, 36 to 117 mg/L (2.1 to 6.8 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 Concow’s ZIP codes, from EPA’s estimates.
- Open report
Thermalito Water & Sewer Dist
California · serves 12,209 people · about 1,000 in Concow
1 result above the legal limit, 1 result above EPA’s new limit, which takes effect in 2029, 1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Haloacetic acids (HAA5) at 47.5 ppb, above the legal limit. Hardness: soft to moderately hard depending on the source, 36 to 117 mg/L (2.1 to 6.8 grains per gallon).
1 health-based violation since 2016
- Open report
Cal - Water Service Co. - Oroville
California · serves 11,047 people · about 390 in Concow
2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 81.3 ppb, above EPA’s health benchmark. Hardness: soft to hard depending on the source, 37 to 145 mg/L (2.2 to 8.5 grains per gallon).
No health-based violations since 2016
- Open report
Foothills Manufactured Home Communuty
California · serves 180 people · under 100 in Concow
1 result above the limit’s level with no violation recorded and 1 result above the health goal. The worst: Arsenic at 23.4 ppb, above the limit’s level, no violation. Hardness: soft to moderately hard depending on the source, 22 to 62 mg/L (1.3 to 3.6 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 Thermalito Water & Sewer 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: PFOS, 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: PFOS, 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: PFOS, Arsenic
Water testing near Concow
The 3 labs California certifies closest to Concow, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Fruit Growers Laboratory, Inc.
Chico, CA · about 18 miles
Certified for bacteria
Cranmer Engineering, Inc.
Grass Valley, CA · about 38 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
Eurofins Sacramento Service Center
West Sacramento, CA · about 69 miles
Certified for bacteria, nitrate, minerals and other inorganics
ZIP codes in Concow
Which ZIP codes are in Concow: 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 Concow
Other towns in Butte County with a page of their own.
What to do next
- Read Thermalito Water & Sewer Dist’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About Haloacetic acids (HAA5)What it does to health, where it comes from, and the certification claim that addresses it.About Haloacetic acids (HAA5)
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water