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Public water system record

Malmstrom Air Force Base

Serves Great Falls and Malmstrom AFB, Cascade County, MT · 8,850 people served

Federal records show 2 health-based violations and 9 monitoring/reporting issues for Malmstrom Air Force Base in the last ten years. The most serious issue in this window was a resolved Haloacetic Acids (HAA5) violation.

  • MT0000515
  • MALMSTROM AIR FORCE BASE
  • MT
  • 8,850 served

System profile

Source water Purchased surface water
ZIP 59402
EPA system ID MT0000515

Verify this system on EPA ECHO →

Health-based violations, last 10 years
2
Resolved
2
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
9

Key facts

  • Malmstrom Air Force Base buys its water from City of Great Falls.
  • Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 61.3 µg/L, federal limit 60 µg/L (at or just above the limit), 2019.
  • Most recent formal enforcement: compliance order (no penalty) by EPA, June 2010.
  • Record on file since 1993, with 5 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 1,241 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
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 61.3 µg/L, federal limit 60 µg/L (at or just above the limit)
 220 Jan 1, 2019 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 61 µg/L, federal limit 60 µg/L (at or just above the limit)
 220 Oct 1, 2018 Resolved No

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
 Nov 1, 2024 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
 Apr 1, 2024 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Apr 1, 2024 Resolved
Consumer Confidence Rule
OTHER
 Jul 1, 2023 Resolved
Lead and Copper Rule
Monitoring and reporting
 Dec 30, 2021 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
 Oct 1, 2020 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Oct 1, 2020 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
 Jul 1, 2017 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Jul 1, 2017 Resolved

Full record since 1993

EPA's records for Malmstrom Air Force Base go back to 1993. Before October 19, 2016 they list 5 health-based violations (5 resolved) and 10 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 0 7
2000s 4 2
2010 to October 18, 2016 1 1
October 19, 2016 to 2019 2 2
2020s 0 7

Most recent health-based violation before October 19, 2016: Haloacetic Acids (HAA5), began April 2010, Resolved.

Show all 5 health-based violations before October 19, 2016
Contaminant Start date Status
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 63 µg/L, federal limit 60 µg/L (1.1 times the limit)
 Apr 1, 2010 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 61.3 µg/L, federal limit 60 µg/L (at or just above the limit)
 Oct 1, 2009 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 67 µg/L, federal limit 60 µg/L (1.1 times the limit)
 Jul 1, 2009 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.064 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 Apr 1, 2009 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 63 µg/L, federal limit 60 µg/L (1.1 times the limit)
 Oct 1, 2008 Resolved

Enforcement actions

EPA took 1 formal enforcement action against Malmstrom Air Force Base in 2010. The most recent was a compliance order (no penalty) in June 2010.

Date By Action Violations covered
Jun 28, 2010 EPA Compliance order (no penalty) 5 violations (4 health-based): Total Coliform, Haloacetic Acids (HAA5)

What the violations mean

Haloacetic Acids (HAA5)

2 incidents

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

Where the water comes from

Malmstrom Air Force Base buys its water from City of Great Falls. It lists no wells or intakes of its own. 1 smaller public system such as schools, businesses or campgrounds buys water from Malmstrom Air Force Base.

Buys water from

Annual water quality report

Malmstrom Air Force Base 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