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Willernie

What EPA’s and Minnesota’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
525 people
Connections
226
Water source
Groundwater bought from another system
Based in
Willernie, MN
County
Washington
Owner
Local government
The ZIP code it serves

55090

The short answer

Nothing in EPA’s and Minnesota’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. No health-based violations on file since 2016.

What was found

Total trihalomethanes (TTHM), arsenic, haloacetic acids (HAA5) and nitrate: Minnesota’s yearly summaries per water system, 2023 to 2025.

Below EPA’s limits1

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

4.5ppb

Highest yearly average, 2023 to 2025

Averaged by year, the highest was 4.5 ppb, in 2025, below EPA’s legal limit of 80 ppb. That was also the latest year on file.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Haloacetic acids (HAA5)
  • Lead
  • Nitrate

Violations since 2016

No health-based violations on file with EPA since 2016. There are 5 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), arsenic, haloacetic acids (HAA5) and nitrate results here are Minnesota’s own yearly summaries from 2023 on, with EPA’s national file for 2012 to 2019. Willernie’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; Minnesota’s yearly summaries cover 2023 to 2025.

Testing your own tap

Willernie’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Minnesota certifies.

The 3 labs Minnesota certifies closest to the area Willernie serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Pace Analytical Services, LLC - Minneapolis

    Minneapolis, MN · about 14 miles

    Certified for bacteria, nitrate, lead and copper, metals

    (612) 607-1700

  • Instrumental Research, Inc.

    Fridley, MN · about 15 miles

    Certified for bacteria, nitrate

    (763) 571-3698

  • EMSL Analytical, Inc.

    New Hope, MN · about 21 miles

    Certified for bacteria, nitrate, lead and copper, metals

    (763) 449-4922

All 24 certified labs for Minnesota

Sources

PWSID MN1820022. Rebuilt from EPA data on Oct. 18, 2026.

Also in Washington County

All Minnesota utilities

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