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Public water system record

Thompson Oaks

Serves an area of Steele County, MN · 51 people served

Federal records show 10 health-based violations and 6 monitoring/reporting issues for Thompson Oaks in the last ten years. The most serious issue in this window was a Gross Alpha, Excl. Radon and U violation that EPA lists as archived, not resolved.

  • MN1740008
  • ELLENDALE
  • MN
  • 51 served

System profile

Source water Groundwater
ZIP 56026
EPA system ID MN1740008

Verify this system on EPA ECHO →

Health-based violations, last 10 years
10
Resolved
4
Unresolved
0
Archived by EPA
6
Any acute record
No
Monitoring issues, last 10 years
6

Key facts

  • Thompson Oaks draws water from 1 well.
  • Highest measured level in the last 10 years: Gross Alpha, Excl. Radon and U, 23 pCi/L, federal limit 15 pCi/L (1.5 times the limit), 2025.
  • Most recent formal enforcement: compliance order (no penalty) by Minnesota, March 2021.
  • Record on file since 2016, with 1 health-based violation before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 17 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 19.5 pCi/L, federal limit 15 pCi/L (1.3 times the limit)
 340 Oct 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 22 pCi/L, federal limit 15 pCi/L (1.5 times the limit)
 340 Jul 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 20 pCi/L, federal limit 15 pCi/L (1.3 times the limit)
 340 Apr 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 23 pCi/L, federal limit 15 pCi/L (1.5 times the limit)
 340 Jan 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 15.6 pCi/L, federal limit 15 pCi/L (at or just above the limit)
 340 Oct 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 17 pCi/L, federal limit 15 pCi/L (1.1 times the limit)
 340 Jan 1, 2023 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 17.3 pCi/L, federal limit 15 pCi/L (1.2 times the limit)
 340 Jul 1, 2020 Resolved No
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 18.3 pCi/L, federal limit 15 pCi/L (1.2 times the limit)
 340 Apr 1, 2020 Resolved No
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 18.2 pCi/L, federal limit 15 pCi/L (1.2 times the limit)
 340 Jan 1, 2020 Resolved No
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 15.3 pCi/L, federal limit 15 pCi/L (at or just above the limit)
 340 Jul 1, 2019 Resolved No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Public Notice
OTHER
 Apr 28, 2025 Resolved
Combined Radium (-226 and -228)
Monitoring and reporting
 Apr 1, 2023 Resolved
Gross Alpha, Excl. Radon and U
Monitoring and reporting
 Apr 1, 2023 Resolved
Lead and Copper Rule
Monitoring and reporting
 Jan 1, 2019 Resolved
Revised Total Coliform Rule
Monitoring violation
 Jul 1, 2017 Resolved
Revised Total Coliform Rule
Monitoring violation
 Jan 1, 2017 Resolved

Full record since 2016

EPA's records for Thompson Oaks go back to 2016. Before October 19, 2016 they list 1 health-based violation (1 resolved) and no monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
2010 to October 18, 2016 1 0
October 19, 2016 to 2019 1 3
2020s 9 3

Most recent health-based violation before October 19, 2016: Gross Alpha, Excl. Radon and U, began January 2016, Resolved.

Show the health-based violation before October 19, 2016
Contaminant Start date Status
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 16 pCi/L, federal limit 15 pCi/L (1.1 times the limit)
 Jan 1, 2016 Resolved

Enforcement actions

Minnesota regulators took 1 formal enforcement action against Thompson Oaks in 2021. The most recent was a compliance order (no penalty) in March 2021.

Date By Action Violations covered
Mar 3, 2021 Minnesota Compliance order (no penalty) 5 violations (5 health-based): Gross Alpha, Excl. Radon and U

What the violations mean

Gross Alpha, Excl. Radon and U

10 incidents

Test results for Gross Alpha, Excl. Radon and U were above the federal limit (a maximum contaminant level violation).

The utility had to notify customers about each of these violations.

Where the water comes from

Thompson Oaks draws water from 1 well.

Annual water quality report

Thompson Oaks must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Thompson Oaks for a copy.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Minnesota.

Certified drinking water labs by state EPA guidance for private wells