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Tap water quality report

Ctwc - Thompson

EPA monitoring tested this supplier for 80 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

80
contaminants tested
17
detected
1,070
people served
4
health-based violations
Connecticut rankingsLead in ConnecticutPFAS in Connecticut
Water source
Ground water
Ownership
Private
Counties served
Windham

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.

4
health-based violations
68
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1995-02-01 → 1995-02-28
MCL Health-based Resolved 1995-02-01 → 1995-02-28
MCL Health-based Resolved 1995-02-01 → 1995-02-28
MCL Health-based Resolved 1995-02-01 → 1995-02-28
MR Monitoring Resolved 2015-04-01 → 2015-06-30
MR Monitoring Resolved 2015-04-01 → 2015-06-30
MR Monitoring Resolved 2015-04-01 → 2015-06-30
MR Monitoring Resolved 2015-04-01 → 2015-06-30
MR Monitoring Resolved 2015-04-01 → 2015-06-30
MR Monitoring Resolved 2015-04-01 → 2015-06-30

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
Copper
730 µg/L 56%
of the EPA limit 1300 µg/L
worst single sample: 1280 µg/L
181/181 SYR4 2014–2019
Lead
35.5 µg/L 237%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 376 µg/L
66/181 SYR4 2014–2019
Lead
0.0011 mg/L 7.3%
of the EPA limit 0.0150 mg/L
 25/25 LCR 2025
Nitrate
1510 µg/L 15%
of the EPA limit 10000 µg/L
 18/18 SYR4 2012–2019
Dibromochloromethane
3.4 µg/L
No EPA limit set
worst single sample: 4.3 µg/L
16/26 SYR4 2012–2019
Bromoform
1.625 µg/L
No EPA limit set
worst single sample: 1.9 µg/L
12/26 SYR4 2012–2019
Bromodichloromethane
2.8 µg/L
No EPA limit set
worst single sample: 3 µg/L
9/26 SYR4 2012–2019
Nitrate-Nitrite
1402 µg/L 14%
of the EPA limit 10000 µg/L
worst single sample: 1510 µg/L
9/9 SYR4 2012–2019
TTHM
9.765 µg/L 12%
of the EPA limit 80 µg/L
worst single sample: 10.5 µg/L
8/8 SYR4 2012–2019
Chloroform
1.625 µg/L
No EPA limit set
worst single sample: 1.7 µg/L
6/26 SYR4 2012–2019
Dibromoacetic Acid
2.075 µg/L
No EPA limit set
worst single sample: 2.2 µg/L
6/8 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
2.275 µg/L 3.8%
of the EPA limit 60 µg/L
worst single sample: 2.3 µg/L
6/8 SYR4 2012–2019
Combined Radium (-226 And -228)
1.47 pCi/L 29%
of the EPA limit 5 pCi/L
worst single sample: 1.5 pCi/L
4/15 SYR4 2013–2018
Barium
53.3 µg/L 2.7%
of the EPA limit 2000 µg/L
worst single sample: 54 µg/L
3/3 SYR4 2012–2018
Dichloroacetic Acid
0.9930 µg/L
No EPA limit set
worst single sample: 1 µg/L
2/8 SYR4 2012–2019
Fluoride
1245.5 µg/L 31%
of the EPA limit 4000 µg/L
worst single sample: 1300 µg/L
2/3 SYR4 2012–2018
Gross Alpha, Excl. Radon And U
4.9725 pCi/L 33%
of the EPA limit 15 pCi/L
worst single sample: 5.05 pCi/L
2/13 SYR4 2013–2018
63 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
LOWRY, PAUL C.
Phone
860-944-9655
Email
[email protected]

Frequently asked questions about Ctwc - Thompson

Is Ctwc - Thompson tap water safe to drink?

EPA monitoring detected 17 contaminants in Ctwc - Thompson'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 Ctwc - Thompson's water?

EPA monitoring detected Copper, Lead, Lead, Nitrate, Dibromochloromethane, and others. The full list with the level and data source for each is above.

How many people does Ctwc - Thompson serve?

Ctwc - Thompson reports serving 1,070 people in Connecticut, per its EPA record.

Has Ctwc - Thompson had any water quality violations?

The EPA has 68 violations on file for Ctwc - Thompson, of which 4 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.