Is Lancaster, KS tap water safe?
The short answer
Neither of the 2 utilities serving Lancaster has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Kansas’s records.
Atchison Co RWD 5c, which serves the most people here, has 1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 55 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.
The water from Atchison Co RWD 5c is very hard, 325 mg/L (19 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 Lancaster’s ZIP codes, from EPA’s estimates.
- Open report
Atchison Co RWD 5c
Kansas · serves 3,690 people · under 100 in Lancaster
1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 55 ppb, above EPA’s health benchmark. Hardness: very hard, 325 mg/L (19 grains per gallon).
No health-based violations since 2016
- Open report
City of Lancaster
Kansas · serves 248 people · under 100 in Lancaster
1 result above the health goal. The worst: Lead at 4.1 ppb, above the health goal.
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 Atchison Co RWD 5c’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 Lancaster
The 3 labs Kansas certifies closest to Lancaster, 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 49 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
KC Water Services Laboratory
Kansas City, MO · about 50 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals
Eurofins Kansas City
Lenexa, KS · about 54 miles
Certified for bacteria
ZIP codes in Lancaster
Which ZIP codes are in Lancaster: 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 Lancaster
Towns nearby with a page of their own.
What to do next
- Read Atchison Co RWD 5c’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