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Mashantucket Pequot Water

EPA monitoring tested this supplier for 100 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

100
contaminants tested
18
detected
22,171
people served
63
health-based violations
Connecticut rankingsLead in ConnecticutPFAS in Connecticut
Water source
Ground water under surface influence
Ownership
Native American

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

63
health-based violations
180
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-07-01 → 2018-09-30
MCL Health-based Resolved 2018-07-01 → 2018-09-30
MCL Health-based Resolved 2018-07-01 → 2018-09-30
MCL Health-based Resolved 1993-02-01 → 1993-02-28
MCL Health-based Resolved 1993-02-01 → 1993-02-28
MCL Health-based Resolved 1993-02-01 → 1993-02-28
MCL Health-based Resolved 1993-02-01 → 1993-02-28

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfpea 0.0191 µg/L 4/4 2024
Pfba 0.0065 µg/L 3/4 2024
PFBS 0.0036 µg/L 3/4 2024
Pfhpa 0.0036 µg/L 3/4 2024
Pfhxa 0.0099 µg/L 3/4 2024
PFOA 0.0074 µg/L 3/4 2024

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
TTHM
109.59 µg/L 137%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 140 µg/L
127/129 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
36.515 µg/L 61%
of the EPA limit 60 µg/L
worst single sample: 48 µg/L
120/129 SYR4 2012–2019
Nitrate
1310 µg/L 13%
of the EPA limit 10000 µg/L
 18/24 SYR4 2012–2019
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 17/17 LCR 2025
Barium
63.65 µg/L 3.2%
of the EPA limit 2000 µg/L
worst single sample: 65 µg/L
10/10 SYR4 2012–2019
Arsenic
1.95 µg/L 20%
of the EPA limit 10 µg/L
worst single sample: 2 µg/L
3/10 SYR4 2012–2019
Cyanide
5 µg/L 2.5%
of the EPA limit 200 µg/L
 1/10 SYR4 2012–2019
Glyphosate
6 µg/L 0.9%
of the EPA limit 700 µg/L
 1/6 SYR4 2013–2019
Gross Alpha, Excl. Radon And U
10.6 pCi/L 71%
of the EPA limit 15 pCi/L
 1/3 SYR4 2015–2018
Nitrite
590 µg/L 59%
of the EPA limit 1000 µg/L
 1/12 SYR4 2012–2019
Pentachlorophenol
0.0650 µg/L 6.5%
of the EPA limit 1 µg/L
 1/6 SYR4 2013–2019
Picloram
0.1250 µg/L 0%
of the EPA limit 500 µg/L
 1/6 SYR4 2013–2019
82 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfdaPfdoaPfeesaPfhpsPFHXSPfmbaPfmpaPFNAPFOSPfpesPftaPftrdaPfunaSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Rodney Butler
Phone
8603966740

Frequently asked questions about Mashantucket Pequot Water

Is Mashantucket Pequot Water tap water safe to drink?

EPA monitoring detected 18 contaminants in Mashantucket Pequot Water's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Mashantucket Pequot Water's water?

EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Nitrate, Lead, Barium, and others. The full list with the level and data source for each is above.

How many people does Mashantucket Pequot Water serve?

Mashantucket Pequot Water reports serving 22,171 people in Connecticut, per its EPA record.

Has Mashantucket Pequot Water had any water quality violations?

The EPA has 180 violations on file for Mashantucket Pequot Water, of which 63 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.