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Water system · PWSID 010106001

Mashantucket Pequot Water System

MASHANTUCKET, CT · ~26,445 people served

Check your exact address → MASHANTUCKET overview
76
Good
PurityRadar safety score

PWSID

010106001

State

Connecticut

City

MASHANTUCKET

Population served

26,445

Primary source

GU

Score history

▼ 24 points — the score moved from 100 to 76 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 76

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

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through May 2024). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

6.6 ppt

limit 4 ppt

Above EPA limit · 1.6×

PFPeA

19 ppt

limit —

No federal limit

PFHxA

9.7 ppt

limit —

No federal limit

PFBA

6.5 ppt

limit —

No federal limit

PFBS

3.4 ppt

limit —

No federal limit

PFHpA

3.3 ppt

limit —

No federal limit

Violations & enforcement

46

Violations on record

0

Unaddressed

7

Health-based

179

Enforcement actions

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

Other · EPA contaminant 7000 began Jul 2025 Resolved
Other · EPA contaminant 7000 began Jul 2024 Resolved
Reporting · Lead & Copper Rule began Nov 2018 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2018 Resolved
Other · EPA contaminant 7500 began Sep 2018 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Aug 2018 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2018 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2031 began Jan 2016 Resolved
Monitoring & reporting · EPA contaminant 2036 began Jan 2016 Resolved
Monitoring & reporting · EPA contaminant 2020 began Jan 2016 Resolved
Monitoring & reporting · EPA contaminant 2035 began Jan 2016 Resolved

Recent enforcement actions

  • EPA/federal action · EOX Oct 2025
  • EPA/federal action · EIF Oct 2025
  • EPA/federal action · EIF Oct 2025
  • EPA/federal action · EOX Oct 2025
  • EPA/federal action · EFG Sep 2025
  • EPA/federal action · EFG Sep 2025
  • EPA/federal action · EOX Feb 2019
  • EPA/federal action · EOX Feb 2019

This profile is built from EPA public records for system 010106001 — 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.