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Public water system record

Twin Hills Colony Inc

On record as serving Carter, Chouteau County, MT · Serves 78 people

Federal records show 8 health-based violations and 12 monitoring/reporting issues for Twin Hills Colony Inc in the last ten years. The most serious issue in this window was a resolved Haloacetic Acids (HAA5) violation.

  • MT0003978
  • CARTER
  • MT
  • 78 served

System profile

Source water Purchased surface water
ZIP 59420
EPA system ID MT0003978

Verify this system on EPA ECHO →

Health-based violations, last 10 years
8
Resolved
8
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
12

Key facts

  • Twin Hills Colony Inc buys its water from Tiber County Water District.
  • Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 81 µg/L, federal limit 60 µg/L (1.4 times the limit), 2019.
  • Most recent formal enforcement: compliance order (no penalty) by Montana, May 2020.
  • Record on file since 2004, with 0 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 19 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 65 µg/L, federal limit 60 µg/L (1.1 times the limit)
 220 Jul 1, 2020 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 81.8 µg/L, federal limit 80 µg/L (at or just above the limit)
 220 Apr 1, 2020 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 73 µg/L, federal limit 60 µg/L (1.2 times the limit)
 220 Jan 1, 2020 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 92 µg/L, federal limit 80 µg/L (1.2 times the limit)
 220 Jan 1, 2020 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 81 µg/L, federal limit 60 µg/L (1.4 times the limit)
 220 Oct 1, 2019 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 94 µg/L, federal limit 80 µg/L (1.2 times the limit)
 220 Oct 1, 2019 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 74 µg/L, federal limit 60 µg/L (1.2 times the limit)
 220 Jul 1, 2019 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 108 µg/L, federal limit 80 µg/L (1.4 times the limit)
 220 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
Lead and Copper Rule
Monitoring and reporting
 Dec 30, 2024 Resolved
Surface Water Treatment Rule
Monitoring and reporting
 Jul 1, 2024 Resolved
Surface Water Treatment Rule
Monitoring and reporting
 Jun 1, 2024 Resolved
Revised Total Coliform Rule
Monitoring violation
 Jan 1, 2024 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
 Oct 1, 2022 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Oct 1, 2022 Resolved
Lead and Copper Rule
Monitoring and reporting
 Dec 30, 2021 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
 Jul 1, 2020 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Jul 1, 2020 Resolved
Consumer Confidence Rule
OTHER
 Jul 1, 2019 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
 Jan 1, 2019 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Jan 1, 2019 Resolved

Full record since 2004

EPA's records for Twin Hills Colony Inc go back to 2004. Before October 19, 2016 they list no health-based violations and 11 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
2000s 0 4
2010 to October 18, 2016 0 7
October 19, 2016 to 2019 4 3
2020s 4 9

Enforcement actions

Montana regulators took 1 formal enforcement action against Twin Hills Colony Inc in 2020, filed as 2 records in EPA's data. The most recent was a compliance order (no penalty) in May 2020.

Date By Action Violations covered
May 14, 2020 Montana Compliance order (no penalty) 5 violations (5 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs)

What the violations mean

Haloacetic Acids (HAA5)

4 incidents

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

Total Trihalomethanes (TTHMs)

4 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Where the water comes from

Twin Hills Colony Inc buys its water from Tiber County Water District. It lists no wells or intakes of its own.

Buys water from

Annual water quality report

Twin Hills Colony Inc 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 Twin Hills Colony Inc 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