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Tap water quality report

Mansfield, CT

EPA monitoring detected 42 contaminants across the 21 water suppliers serving Mansfield. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

21
water suppliers
153,026
people served
42
contaminants found
Connecticut rankings Lead in Connecticut PFAS in Connecticut

What was found in Mansfield's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
5976.999999999996 µg/L 60%
of the EPA limit 10000 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
16/21 SYR4
Nitrate-Nitrite
5938 µg/L 59%
of the EPA limit 10000 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
17/21 SYR4
Fluoride
1075.9999999999998 µg/L 27%
of the EPA limit 4000 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
Highest in the city: 1263.9999999999995 µg/L — WINDHAM WATER WORKS · 21,214 people · 2019
15/21 SYR4
Chlorite
752.5 µg/L 75%
of the EPA limit 1000 µg/L
Highest in the city: WINDHAM WATER WORKS · 21,214 people · 2019
1/21 SYR4
Copper
231.39999999999998 µg/L 18%
of the EPA limit 1300 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
Highest in the city: 747.9999999999997 µg/L — CTWC - PINEWOODS LANE DIV · 68 people · 2017
17/21 SYR4
Barium
346.79999999999995 µg/L 17%
of the EPA limit 2000 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
15/21 SYR4
TTHM
80.8 µg/L 101%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
Highest in the city: 81.755 µg/L — WINDHAM WATER WORKS · 21,214 people · 2019
6/21 SYR4
Nitrite
55.89999999999995 µg/L 5.6%
of the EPA limit 1000 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
Highest in the city: 80.49 µg/L — WHITE OAK CONDOMINIUMS · 192 people · 2019
5/21 SYR4
Lead
72.10000000000011 µg/L 481%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
17/21 SYR4
Chloroform
62.44 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
Highest in the city: 65.5 µg/L — WINDHAM WATER WORKS · 21,214 people · 2019
8/21 SYR4
Total Haloacetic Acids (HAA5)
27 µg/L 45%
of the EPA limit 60 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
Highest in the city: 28 µg/L — WINDHAM WATER WORKS · 21,214 people · 2019
5/21 SYR4
Lithium
19.8 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2025
1/21 UCMR-5
Dichloroacetic Acid
13.25 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
Highest in the city: 18 µg/L — WINDHAM WATER WORKS · 21,214 people · 2019
5/21 SYR4
Bromodichloromethane
15 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
6/21 SYR4
Trichloroacetic Acid
14 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
5/21 SYR4
Chromium
1 µg/L 1%
of the EPA limit 100 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
Highest in the city: 10 µg/L — ORCHARD ACRES ASSOCIATION · 176 people · 2018
2/21 SYR4
Combined Uranium
5.455 µg/L 18%
of the EPA limit 30 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2018
Highest in the city: 6.119349 µg/L — WHITE OAK CONDOMINIUMS · 192 people · 2019
10/21 SYR4
Dibromochloromethane
6 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
6/21 SYR4
Gross Alpha, Excl. Radon And U
5.4035 pCi/L 36%
of the EPA limit 15 pCi/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2018
Highest in the city: 6 pCi/L — AQUARION-VALLEY VIEW · 131 people · 2019
7/21 SYR4
Arsenic
5.25 µg/L 53%
of the EPA limit 10 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
5/21 SYR4
Cyanide
5 µg/L 2.5%
of the EPA limit 200 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
1/21 SYR4
Monochloroacetic Acid
1.295 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
Highest in the city: 3.45 µg/L — WINDHAM WATER WORKS · 21,214 people · 2019
4/21 SYR4
Combined Radium (-226 And -228)
2.9000000000000004 pCi/L 58%
of the EPA limit 5 pCi/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2018
9/21 SYR4
Bromoform
2.0299999999999985 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
Highest in the city: 2.23 µg/L — UNIVERSITY OF CONNECTICUT - MAIN CAMPUS · 27,199 people · 2019
4/21 SYR4
Di(2-ethylhexyl) Phthalate
2 µg/L 33%
of the EPA limit 6 µg/L
Highest in the city: ORCHARD ACRES ASSOCIATION · 176 people · 2019
3/21 SYR4
Dibromoacetic Acid
2 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
4/21 SYR4
Selenium
2 µg/L 4%
of the EPA limit 50 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
1/21 SYR4
Mercury
1.3 µg/L 65%
of the EPA limit 2 µg/L
Highest in the city: MANSFIELD VILLAGE, LLC · 40 people · 2019
2/21 SYR4
Toluene
1.1 µg/L 0.1%
of the EPA limit 1000 µg/L
Highest in the city: CTWC - CRYSTAL SPRINGS DIV. · 169 people · 2019
1/21 SYR4
Trichloroethylene
0.9970 µg/L 20%
of the EPA limit 5 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
1/21 SYR4
Tetrachloroethylene
0.7065 µg/L 14%
of the EPA limit 5 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
1/21 SYR4
Monobromoacetic Acid
0.5000 µg/L
No EPA limit set
Highest in the city: CLUB HOUSE APARTMENTS · 115 people · 2019
1/21 SYR4
Antimony, Total
0.4000 µg/L 6.7%
of the EPA limit 6 µg/L
Highest in the city: KNOLLWOOD APARTMENTS · 312 people · 2018
1/21 SYR4
Benzo(A)Pyrene
0.0630 µg/L 32%
of the EPA limit 0.2000 µg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2019
1/21 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2026
Highest in the city: 0.0122 mg/L — MANSFIELD VILLAGE, LLC · 40 people · 2023
21/21 LCR
PFOA
0.0080 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2025
1/21 UCMR-5
PFOS
0.0060 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2025
2/21 UCMR-5
Pfba
0.0050 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2025
2/21 UCMR-5
Pfhxa
0.0030 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2025
Highest in the city: 0.0034 µg/L — WINDHAM WATER WORKS · 21,214 people · 2024
2/21 UCMR-5
PFBS
0.0030 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2025
1/21 UCMR-5
PFHXS
0.0030 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2025
1/21 UCMR-5
Pfpea
0.0030 µg/L
No EPA limit set
Main supplier: CTWC - NORTHERN REG-WESTERN SYSTEM · 101,313 people · 2025
1/21 UCMR-5
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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Mansfield

SupplierPopulation served
CTWC - NORTHERN REG-WESTERN SYSTEM 101,313
UNIVERSITY OF CONNECTICUT - MAIN CAMPUS 27,199
WINDHAM WATER WORKS 21,214
CTWC - UCONN SOUTH EAGLEVILLE DIV. 750
KNOLLWOOD APARTMENTS 312
CTWC - UCONN HUNTING LODGE DIV. 234
CARRIAGE HOUSE APARTMENTS 196
WHITE OAK CONDOMINIUMS 192
RENWOOD APARTMENTS 190
ORCHARD ACRES ASSOCIATION 176
CTWC - CRYSTAL SPRINGS DIV. 169
MAPLEWOOD-MILLBROOK APARTMENTS 153
CTWC - UCONN DEPOT DIV. 153
CTWC - UCONN WILLOWBROOK DIV. 134
AQUARION-VALLEY VIEW 131
CLUB HOUSE APARTMENTS 115
HUNTING LODGE APARTMENTS 115
WOODS EDGE APARTMENTS 96
CTWC - BIRCHWOOD HEIGHTS 76
CTWC - PINEWOODS LANE DIV 68
MANSFIELD VILLAGE, LLC 40

Frequently asked questions about Mansfield tap water

Is Mansfield tap water safe to drink?

EPA testing detected 42 contaminants in the water serving Mansfield. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Mansfield?

21 public water suppliers report drinking-water monitoring for Mansfield, Connecticut to the EPA. Each is listed above with its population served.

What contaminants are in Mansfield's water?

The contaminants EPA monitoring detected in Mansfield include Nitrate, Nitrate-Nitrite, Fluoride, Chlorite, Copper. The full list, with the level at the main supplier and the data source, is in the table above.

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.