City of Allen
What EPA’s and Kansas’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.
- Serves
- 159 people
- Connections
- 85
- Water source
- Surface water bought from another system
- Based in
- Allen, KS
- County
- Lyon
- Owner
- Local government
The ZIP code it serves
The short answer
1 result is above the limit’s level with no violation recorded. The worst: Haloacetic acids (HAA5), above the limit’s level, no violation. No health-based violations on file since 2016.
What was found
Haloacetic acids (HAA5) and total trihalomethanes (TTHM): Kansas’s own results, samples taken from Aug. 10, 2020 to July 14, 2026, with EPA’s 2012 to 2019 file for earlier years.
Above the limit’s level, no violation recorded1
Haloacetic acids (HAA5)
Forms or is added in treatment
62.5ppb
Highest yearly average, 2020 to 2026
2026, one sample: 13 ppb
Averaged by year, the highest was 62.5 ppb, in 2020, above EPA’s legal limit of 60 ppb. Its highest single sample was 110 ppb. In 2026, the latest year on file, its one sample was 13 ppb. EPA judges this limit on running averages at each sampling point, and recorded no violation for haloacetic acids (HAA5) at this utility since 2020. Results like these with no violation often include water sampled before treatment or blending; the utility’s annual report says what reaches the tap. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 30.3 ppb, in 2014.
What handles it
No certification claim covers this compound yet.
Below EPA’s limits1
Total trihalomethanes (TTHM)
Forms or is added in treatment
6.7ppb
Highest yearly average, 2020 to 2026
2026: not found
Averaged by year, the highest was 6.7 ppb, in 2023, below EPA’s legal limit of 80 ppb. Its highest single sample was 11 ppb. In 2026, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 68.8 ppb, in 2014.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Lead
Violations since 2016
No health-based violations on file with EPA since 2016.
What this report can’t tell you
Everything else. Haloacetic acids (HAA5) and total trihalomethanes (TTHM) results here are Kansas’s own from 2020 on, with EPA’s national file for 2012 to 2019. City of Allen’s own annual report, which it must send you every year, has the contaminants this page does not show.
Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.
What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.
Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; Kansas’s results run from Aug. 10, 2020 to July 14, 2026.
Testing your own tap
The 3 labs Kansas certifies closest to the area City of Allen serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Irwin Army Community Hospital-Water Laboratory-PH-EH
Fort Riley, KS · about 42 miles
Certified for bacteria
Johnson County Water Quality Laboratory
Olathe, KS · about 72 miles
Certified for bacteria, nitrate, lead and copper
Olathe Environmental Laboratory
Olathe, KS · about 72 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
Sources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- Kansas Department of Health and Environment, Public Water Supply Section, results from Jan. 2, 2020 to Sept. 16, 2026, read Oct. 18, 2026
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Certified labs: Kansas Department of Health and Environment, drinking water labs, as listed in TNI LAMS, read Oct. 13, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID KS2011102. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Read up on Haloacetic acids (HAA5)What each one does to health, where it comes from, and the certification claim that addresses it.About Haloacetic acids (HAA5)
- Get the utility’s own reportCity of Allen must send you a water quality report every year. It covers contaminants this page does not show.How to read it
- Test your own tap for leadYour service line, solder and fixtures decide the lead at your faucet, not the utility’s average.Lead in your water: what to do
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded