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Public water system record

City of Hardin

Serves Hardin, Big Horn County, MT · 3,500 people served

Federal records show no health-based violations and 4 monitoring/reporting issues for City of Hardin in the last ten years.

  • MT0000235
  • HARDIN
  • MT
  • 3,500 served

System profile

Source water Surface water
ZIP 59034
EPA system ID MT0000235

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
4

Key facts

  • City of Hardin draws water from 1 surface water intake.
  • Record on file since 1994, with 6 health-based violations before October 19, 2016.
  • Lead pipe inventory: 3 lead and 865 unknown out of 1,417 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
Haloacetic Acids (HAA5)
Monitoring and reporting
 Apr 1, 2025 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Apr 1, 2025 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
 Sep 1, 2020 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Sep 1, 2020 Resolved

Full record since 1994

EPA's records for City of Hardin go back to 1994. Before October 19, 2016 they list 6 health-based violations (6 resolved) and 16 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 6 5
2000s 0 7
2010 to October 18, 2016 0 4
2020s 0 4

Most recent health-based violation before October 19, 2016: Surface Water Treatment Rule, began April 1995, Resolved.

Show all 6 health-based violations before October 19, 2016
Contaminant Start date Status
Surface Water Treatment Rule
Treatment technique failure
 Apr 1, 1995 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Feb 1, 1995 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Dec 1, 1994 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Oct 1, 1994 Resolved
Surface Water Treatment Rule
Treatment technique failure
 May 1, 1994 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Apr 1, 1994 Resolved

Where the water comes from

City of Hardin draws water from 1 surface water intake. 1 other community water system and 2 smaller public systems such as schools, businesses or campgrounds buy water from City of Hardin. 1 other public water system has a seasonal connection to City of Hardin.

Community systems that buy water from it

Annual water quality report

City of Hardin 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.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

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