F13/100
Mashantucket Pequot Water System — Water Quality Report 2026
Serving 26,445 people · Connecticut
Water Source
Groundwater Under Influence of Surface Water
County
—
System ID
010106001
Violations
45
Contaminant Test Results
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOA | 0.007 µg/L | 0.004 µg/L | Over Limit |
chlorate | 370.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
0
Health-Related
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About Mashantucket Pequot Water System
Is Mashantucket Pequot Water System water safe to drink?
Mashantucket Pequot Water System water receives a grade of F (13/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 45 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has Mashantucket Pequot Water System detected?
69 contaminants were tested in Mashantucket Pequot Water System's water. Notable contaminants include PFOA, Lead (90th percentile), chlorate. 1 exceed EPA legal limits (MCLs). 3 exceed EPA health goals (MCLGs).
Does Mashantucket Pequot Water System have any EPA violations?
Yes, Mashantucket Pequot Water System has 45 EPA violation(s) on record, with the most recent in 2024. Violation types include Other, RPT, MCL. 7 are health-based violations.
How many people does Mashantucket Pequot Water System serve?
Mashantucket Pequot Water System serves approximately 26,445 people, Connecticut.
What type of water does Mashantucket Pequot Water System provide?
Mashantucket Pequot Water System sources its water from groundwater under influence of surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is 010106001.
How does Mashantucket Pequot Water System compare to other utilities in Connecticut?
Mashantucket Pequot Water System scores 13/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Connecticut state page for a full comparison of water systems.