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Water system · PWSID MT0003978

TWIN HILLS COLONY INC

CARTER, MT · ~78 people served

Check your exact address → CARTER overview
100
Excellent
PurityRadar safety score

PWSID

MT0003978

State

Montana

City

CARTER

Population served

78

Primary source

SWP

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

31

Violations on record

0

Unaddressed

8

Health-based

80

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Feb 2025. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Dec 2024 Resolved
Monitoring & reporting · EPA contaminant 0200 began Jul 2024 Resolved
Monitoring & reporting · EPA contaminant 0200 began Jun 2024 Resolved
Monitoring · Lead & Copper Rule began Jan 2024 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Oct 2022 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2022 Resolved
Monitoring & reporting · Lead & Copper Rule began Dec 2021 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2020 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jul 2020 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2020 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2020 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jan 2020 Resolved

Recent enforcement actions

  • State action · SIA Feb 2025
  • State action · SOX Feb 2025
  • State action · SIA Aug 2024
  • State action · SOX Aug 2024
  • State action · SIA Aug 2024
  • State action · SOX Aug 2024
  • State action · SIE Aug 2024
  • State action · SIE Aug 2024

This profile is built from EPA public records for system MT0003978 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.