Is Winchester, KS tap water safe?
The short answer
Neither of the 2 utilities serving Winchester has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Kansas’s records.
Jefferson Co RWD 12, which serves the most people here, has 2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 58 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.
The water from Jefferson Co RWD 12 is very hard, typically 263 mg/L (15.4 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 Winchester’s ZIP codes, from EPA’s estimates.
- Open report
Jefferson Co RWD 12
Kansas · serves 3,635 people · under 100 in Winchester
2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 58 ppb, above EPA’s health benchmark. Hardness: very hard, typically 263 mg/L (15.4 grains per gallon).
No health-based violations since 2016
- Open report
City of Winchester
Kansas · serves 450 people · under 100 in Winchester
1 result above the health goal. The worst: Lead at 2.1 ppb, above the health goal. Hardness: very hard, 265 mg/L (15.5 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 Jefferson Co RWD 12’s water, which serves the most people here. Another utility’s report names what handles its own results.
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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: Lead, 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: Lead, Arsenic
Water testing near Winchester
The 3 labs Kansas certifies closest to Winchester, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Water District No 1 of Johnson County-WaterOne
Kansas City, KS · about 34 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
Johnson County Water Quality Laboratory
Olathe, KS · about 36 miles
Certified for bacteria, nitrate, lead and copper
Olathe Environmental Laboratory
Olathe, KS · about 36 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
ZIP codes in Winchester
Which ZIP codes are in Winchester: 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 Winchester
Towns nearby with a page of their own.
What to do next
- Read Jefferson Co RWD 12’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