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Randolph

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
355 people
Connections
179
Water source
Groundwater
Based in
Randolph, MN
County
Dakota
Owner
Local government
The 2 ZIP codes it serves

55009, 55065

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. 1 health-based violation since 2016.

What was found

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

Fluoride, arsenic and chromium (total): EPA’s compliance monitoring file, samples taken from Jan. 11, 2012 to Dec. 11, 2019. Newer results are in the utility’s annual water quality report.

Below EPA’s limits1

Fluoride

Forms or is added in treatment

Below EPA’s limits

1.2ppm

Highest yearly average, 2012 to 2019

2019 average: 0.3 ppm

Averaged by year, the highest was 1.2 ppm, in 2012, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 1.4 ppm. In 2019, the latest year on file, its four samples averaged 0.3 ppm.

What handles it

6 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • Haloacetic acids (HAA5)
  • Lead
  • Nitrate
  • Total trihalomethanes (TTHM)

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Stage 1 Disinfectants and Disinfection Byproducts RuleTreatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. OperatorJuly 1, 2025—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 16 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Haloacetic acids (HAA5), nitrate and total trihalomethanes (TTHM) results here are Minnesota’s own yearly summaries from 2023 on, with EPA’s national file for 2012 to 2019. Fluoride, arsenic and chromium (total) come from EPA’s file alone, which ends in 2019. Randolph’s own annual report, which it must send you every year, has newer results for those and 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; EPA’s compliance samples are from Jan. 11, 2012 to Dec. 11, 2019.

Testing your own tap

Randolph’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 Randolph serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Red Wing City Laboratory

    Red Wing, MN · about 20 miles

    Certified for bacteria

    (651) 385-5143

  • RMB Environmental Laboratories, Inc. - Burnsville

    Burnsville, MN · about 24 miles

    Certified for bacteria, nitrate

    (952) 456-8470

  • Tri-City/William Lloyd Analytical Lab

    Bloomington, MN · about 29 miles

    Certified for bacteria, nitrate, metals

    (952) 563-4904

All 24 certified labs for Minnesota

Sources

PWSID MN1190025. Rebuilt from EPA data on Oct. 18, 2026.

Also in Dakota County

All Minnesota utilities

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