Mashantucket Pequot Water System
Published drinking-water records and contacts for Mashantucket Pequot Water System. System 010106001. Review sources and dates; not a real-time water assessment.
- System ID
- 010106001
- State or territory
- CT
- Published population served
- 22171
- System type (source code)
- CWS
Published records and dates
- PFAS / lithium (EPA UCMR 5): 120 — 2023-08-09 – 2024-05-13
- Lead and copper monitoring summaries: 17 — 2004-07-01 – 2025-12-31
Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.
Published testing results
Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.
“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example
| Substance | Published result | Reporting limit | Sample date | Sampling location |
|---|---|---|---|---|
| 11Cl-PF3OUdS | < 0.005 µg/L | 0.005 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| 4:2 FTS | < 0.003 µg/L | 0.003 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| 6:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| 8:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| 9Cl-PF3ONS | < 0.002 µg/L | 0.002 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| ADONA | < 0.003 µg/L | 0.003 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| HFPO-DA | < 0.005 µg/L | 0.005 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| NEtFOSAA | < 0.005 µg/L | 0.005 µg/L | 2024-04-03 | MPTN WTP / TP1 |
| NFDHA | < 0.02 µg/L | 0.02 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| NMeFOSAA | < 0.006 µg/L | 0.006 µg/L | 2024-04-03 | MPTN WTP / TP1 |
| PFBA | 0.0065 µg/L | 0.005 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFBS | 0.0034 µg/L | 0.003 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFDA | < 0.003 µg/L | 0.003 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFDoA | < 0.003 µg/L | 0.003 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFEESA | < 0.003 µg/L | 0.003 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFHpA | 0.0033 µg/L | 0.003 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFHpS | < 0.003 µg/L | 0.003 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFHxA | 0.0097 µg/L | 0.003 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFHxS | < 0.003 µg/L | 0.003 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFMBA | < 0.003 µg/L | 0.003 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFMPA | < 0.004 µg/L | 0.004 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFNA | < 0.004 µg/L | 0.004 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFOA | 0.0066 µg/L | 0.004 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFOS | < 0.004 µg/L | 0.004 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFPeA | 0.0191 µg/L | 0.003 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFPeS | < 0.004 µg/L | 0.004 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| PFTA | < 0.008 µg/L | 0.008 µg/L | 2024-04-03 | MPTN WTP / TP1 |
| PFTrDA | < 0.007 µg/L | 0.007 µg/L | 2024-04-03 | MPTN WTP / TP1 |
| PFUnA | < 0.002 µg/L | 0.002 µg/L | 2024-05-13 | MPTN WTP / TP1 |
| lithium | < 9 µg/L | 9 µg/L | 2024-04-03 | MPTN WTP / TP1 |
Download all EPA UCMR 5 records (CSV)
Lead and copper: 90th-percentile summaries
These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile
| Substance | Published 90th percentile | Monitoring period | Source quarter |
|---|---|---|---|
| Lead (PB90) | = 0.001 mg/L | 2023-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | = 0.0039 mg/L | 2020-01-01 – 2022-12-31 | 2026Q3 |
| Lead (PB90) | = 0.0023 mg/L | 2017-01-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | = 0.004 mg/L | 2014-01-01 – 2016-12-31 | 2026Q3 |
| Lead (PB90) | = 0.0014 mg/L | 2014-01-01 – 2016-12-31 | 2026Q3 |
| Lead (PB90) | = 0.0027 mg/L | 2014-01-01 – 2016-12-31 | 2026Q3 |
| Lead (PB90) | = 0.002 mg/L | 2014-01-01 – 2016-12-31 | 2026Q3 |
| Lead (PB90) | < 0.001 mg/L | 2014-01-01 – 2016-12-31 | 2026Q3 |
Published compliance history
9 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
| Rule / record | Period | Recorded status | Health-based (EPA classification) | Source quarter |
|---|---|---|---|---|
| Consumer Confidence Rule / Consumer Confidence Report Inadequate Reporting | 2025-07-01 – — | Resolved | No | 2026Q3 |
| Consumer Confidence Rule / Consumer Confidence Report Inadequate Reporting | 2024-07-01 – — | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Report Sample Result/Fail Monitor (RTCR) | 2018-11-01 – — | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average | 2018-10-01 – 2018-12-31 | Resolved | Yes | 2026Q3 |
| Public Notice Rule and Revised PN Rule / Public Notification Violation for NPDWR Violation | 2018-09-28 – — | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Failure Submit IDSE/Subpart V Plan Rpt | 2018-08-09 – — | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average | 2018-07-01 – 2018-09-30 | Resolved | Yes | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Failure Submit IDSE/Subpart V Plan Rpt | 2018-07-01 – — | Resolved | No | 2026Q3 |
| Public Notice Rule and Revised PN Rule / Public Notification Violation for NPDWR Violation | 2018-04-02 – 2018-04-04 | Archived | No | 2026Q3 |
Source dates and refresh checks
A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.
- EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
- EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
- EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
Administrative contact (EPA filing)
Mashantucket Pequot Tribal Utilities: 8603966740
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.