Is Coldwater, KS tap water safe?
The short answer
1 of the 2 utilities serving Coldwater has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Kansas’s records: Comanche Co RWD 2.
City of Coldwater, which serves the most people here, has 1 result 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 City of Coldwater is hard, typically 135 mg/L (7.9 grains per gallon). How Kansas’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 Coldwater’s ZIP codes, from EPA’s estimates.
- Open report
City of Coldwater
Kansas · serves 672 people · under 100 in Coldwater
1 result above the health goal. The worst: Arsenic at 3.6 ppb, above the health goal. Hardness: hard, typically 135 mg/L (7.9 grains per gallon).
No health-based violations since 2016
- Open report
Comanche Co RWD 2
Kansas · serves 173 people · under 100 in Coldwater
1 result above the legal limit and 2 results above the health goal. The worst: Nitrate at 12 ppm, above the legal limit. Hardness: very hard, 190 mg/L (11.1 grains per gallon).
3 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 City of Coldwater’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 Coldwater
The lab Kansas certifies closest to Coldwater, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Servi-Tech, Inc
Dodge City, KS · about 57 miles
Certified for bacteria
ZIP codes in Coldwater
Which ZIP codes are in Coldwater: 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: Kansas Department of Health and Environment, drinking water labs, as listed in TNI LAMS; distances from the Census 2020 ZIP code tabulation area gazetteer.
Near Coldwater
Towns nearby with a page of their own.
What to do next
- Read City of Coldwater’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