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Public water system record

Antelope County Water and Sewer

Serves Antelope, Sheridan County, MT · 59 people served

Federal records show no health-based violations and 12 monitoring/reporting issues for Antelope County Water and Sewer in the last ten years.

  • MT0003203
  • ANTELOPE
  • MT
  • 59 served

System profile

Source water Purchased surface water
ZIP 59211
EPA system ID MT0003203

Verify this system on EPA ECHO →

Health-based violations, last 10 years
0
Resolved
0
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
12

Key facts

  • Antelope County Water and Sewer buys its water from Dry Prairie Rural Water Authority.
  • Record on file since 1993, with 12 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 51 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.

None since October 2016.

Monitoring and reporting issues

Since October 2016

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

Issue Start date Status
Revised Total Coliform Rule
Monitoring violation
 Dec 1, 2025 Resolved
Revised Total Coliform Rule
Monitoring violation
 Dec 1, 2024 Resolved
Revised Total Coliform Rule
Monitoring violation
 Jun 1, 2023 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
 Jan 1, 2023 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Jan 1, 2023 Resolved
Revised Total Coliform Rule
Monitoring violation
 Dec 1, 2021 Resolved
Consumer Confidence Rule
OTHER
 Jul 1, 2021 Resolved
Consumer Confidence Rule
OTHER
 Jul 1, 2020 Resolved
Revised Total Coliform Rule
Monitoring violation
 Jan 1, 2020 Resolved
Revised Total Coliform Rule
Monitoring violation
 Sep 1, 2019 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
 Aug 31, 2019 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Aug 31, 2019 Resolved

Full record since 1993

EPA's records for Antelope County Water and Sewer go back to 1993. Before October 19, 2016 they list 12 health-based violations (12 resolved) and 14 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 1 4
2000s 0 4
2010 to October 18, 2016 11 6
October 19, 2016 to 2019 0 3
2020s 0 9

Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began April 2015, Resolved.

Show all 12 health-based violations before October 19, 2016
Contaminant Start date Status
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 141.3 µg/L, federal limit 80 µg/L (1.8 times the limit)
 Apr 1, 2015 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 88.5 µg/L, federal limit 60 µg/L (1.5 times the limit)
 Apr 1, 2015 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.0878 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
 Jan 1, 2015 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1373 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
 Jan 1, 2015 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.082 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
 Oct 1, 2014 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.132 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
 Oct 1, 2014 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.065 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 Jul 1, 2014 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.141 mg/L, federal limit 0.08 mg/L (1.8 times the limit)
 Jul 1, 2014 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.136 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
 Apr 1, 2014 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.11 mg/L, federal limit 0.06 mg/L (1.8 times the limit)
 Jul 1, 2013 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.204 mg/L, federal limit 0.08 mg/L (2.6 times the limit)
 Jul 1, 2013 Resolved
Total Coliform
Contaminant limit exceeded
 Jun 1, 1999 Resolved

Where the water comes from

Antelope County Water and Sewer buys its water from Dry Prairie Rural Water Authority. It lists no wells or intakes of its own.

Buys water from

Annual water quality report

Antelope County Water and Sewer 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 Antelope County Water and Sewer 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 Montana.

Certified drinking water labs by state EPA guidance for private wells