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Tap water quality report

Ctwc - Unionville

EPA monitoring tested this supplier for 111 contaminants and detected 29. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

111
contaminants tested
29
detected
14,693
people served
9
health-based violations
Connecticut rankingsLead in ConnecticutPFAS in Connecticut
Water source
SWP
Ownership
Private
Counties served
Hartford

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.

9
health-based violations
18
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Archived 2026-05-01 → 2026-05-31
TT Health-based Resolved 2019-11-01 → 2019-11-30
TT Health-based Resolved 2019-11-01 → 2019-11-30
TT Health-based Resolved 2019-11-01 → 2019-11-30
TT Health-based Resolved 2019-11-01 → 2019-11-30
MCL Health-based Resolved 2002-08-01 → 2002-08-31
MCL Health-based Resolved 2002-08-01 → 2002-08-31
MCL Health-based Resolved 2002-08-01 → 2002-08-31
MCL Health-based Resolved 2002-08-01 → 2002-08-31
MR Monitoring Resolved 2016-12-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0070 µg/L 2/10 2023
Pfhxa 0.0040 µg/L 2/10 2023
PFHXS 0.0030 µg/L 2/10 2023
PFOA 0.0060 µg/L 2/10 2023
PFOS 0.0060 µg/L 2/10 2023
Pfpea 0.0040 µg/L 2/10 2023

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
Chloroform
52 µg/L
No EPA limit set
worst single sample: 89 µg/L
203/271 SYR4 2012–2019
Bromodichloromethane
7.015 µg/L
No EPA limit set
worst single sample: 11.1 µg/L
198/271 SYR4 2012–2019
TTHM
57.54 µg/L 72%
of the EPA limit 80 µg/L
worst single sample: 94.5 µg/L
183/183 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
40 µg/L 67%
of the EPA limit 60 µg/L
worst single sample: 48.6 µg/L
174/179 SYR4 2012–2019
Dichloroacetic Acid
16 µg/L
No EPA limit set
worst single sample: 19.5 µg/L
173/179 SYR4 2012–2019
Trichloroacetic Acid
25.05 µg/L
No EPA limit set
worst single sample: 36 µg/L
171/179 SYR4 2012–2019
Nitrate
3330 µg/L 33%
of the EPA limit 10000 µg/L
worst single sample: 4670 µg/L
132/132 SYR4 2012–2019
Dibromochloromethane
3.555 µg/L
No EPA limit set
worst single sample: 4.7 µg/L
110/271 SYR4 2012–2019
Copper
965.75 µg/L 74%
of the EPA limit 1300 µg/L
worst single sample: 1120 µg/L
106/106 SYR4 2013–2019
Lead
12.3 µg/L 82%
of the EPA limit 15 µg/L
worst single sample: 32 µg/L
58/106 SYR4 2013–2019
Nitrate-Nitrite
2838 µg/L 28%
of the EPA limit 10000 µg/L
worst single sample: 3330 µg/L
53/53 SYR4 2012–2019
Tetrachloroethylene
2.615 µg/L 52%
of the EPA limit 5 µg/L
worst single sample: 3.2 µg/L
38/88 SYR4 2012–2019
Barium
310.2 µg/L 16%
of the EPA limit 2000 µg/L
worst single sample: 467 µg/L
17/17 SYR4 2012–2019
Bromoform
1.25 µg/L
No EPA limit set
worst single sample: 1.4 µg/L
16/271 SYR4 2012–2019
Lead
0.0024 mg/L 16%
of the EPA limit 0.0150 mg/L
 11/11 LCR 2025
Monochloroacetic Acid
5.55 µg/L
No EPA limit set
worst single sample: 7.8 µg/L
10/179 SYR4 2012–2019
Dibromoacetic Acid
1.995 µg/L
No EPA limit set
worst single sample: 2.1 µg/L
8/179 SYR4 2012–2019
cis-1,2-Dichloroethylene
1.395 µg/L 2%
of the EPA limit 70 µg/L
worst single sample: 1.4 µg/L
2/88 SYR4 2012–2019
1,1,1-Trichloroethane
0.6200 µg/L 0.3%
of the EPA limit 200 µg/L
 1/88 SYR4 2012–2019
Combined Radium (-226 And -228)
1.6 pCi/L 32%
of the EPA limit 5 pCi/L
 1/10 SYR4 2014–2019
Fluoride
50 µg/L 1.3%
of the EPA limit 4000 µg/L
 1/17 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
4.2 pCi/L 28%
of the EPA limit 15 pCi/L
 1/10 SYR4 2014–2019
Selenium
1 µg/L 2%
of the EPA limit 50 µg/L
 1/17 SYR4 2012–2019
82 contaminants tested, none detected
1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndrinEthylbenzeneGlyphosateGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MCDERMOTT, GERALD
Phone
860-664-6125
Email
[email protected]

Frequently asked questions about Ctwc - Unionville

Is Ctwc - Unionville tap water safe to drink?

EPA monitoring detected 29 contaminants in Ctwc - Unionville'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 - Unionville's water?

EPA monitoring detected Chloroform, Bromodichloromethane, TTHM, Total Haloacetic Acids (HAA5), Dichloroacetic Acid, and others. The full list with the level and data source for each is above.

How many people does Ctwc - Unionville serve?

Ctwc - Unionville reports serving 14,693 people in Connecticut, per its EPA record.

Has Ctwc - Unionville had any water quality violations?

The EPA has 18 violations on file for Ctwc - Unionville, of which 9 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.