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Tap water quality report

Rocky Hill, CT

EPA monitoring detected 19 contaminants across the 2 water suppliers serving Rocky Hill. 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.

2
water suppliers
391,125
people served
19
contaminants found
Connecticut rankings Lead in Connecticut PFAS in Connecticut

What was found in Rocky Hill'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
Fluoride
1029 µg/L 26%
of the EPA limit 4000 µg/L
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Nitrate
219 µg/L 2.2%
of the EPA limit 10000 µg/L
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Nitrate-Nitrite
198.3 µg/L 2%
of the EPA limit 10000 µg/L
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Copper
183.1 µg/L 14%
of the EPA limit 1300 µg/L
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
TTHM
71.5525 µg/L 89%
of the EPA limit 80 µg/L
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Chloroform
64.475 µg/L
No EPA limit set
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Total Haloacetic Acids (HAA5)
52.705 µg/L 88%
of the EPA limit 60 µg/L
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Monobromoacetic Acid
42.1251 µg/L
No EPA limit set
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Trichloroacetic Acid
36.0718 µg/L
No EPA limit set
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Dichloroacetic Acid
17.34 µg/L
No EPA limit set
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Lead
13.35 µg/L 89%
of the EPA limit 15 µg/L
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Barium
10.535 µg/L 0.5%
of the EPA limit 2000 µg/L
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Bromodichloromethane
6.6695 µg/L
No EPA limit set
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Monochloroacetic Acid
2.07175 µg/L
No EPA limit set
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Combined Radium (-226 And -228)
1.4465 pCi/L 29%
of the EPA limit 5 pCi/L
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2018
1/2 SYR4
Dibromochloromethane
0.7503 µg/L
No EPA limit set
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Beryllium, Total
0.6327 µg/L 16%
of the EPA limit 4 µg/L
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Mercury
0.2000 µg/L 10%
of the EPA limit 2 µg/L
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2019
1/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: METROPOLITAN DISTRICT COMMISSION · 390,887 people · 2025
Highest in the city: 0.00020 mg/L — APPLE REHAB · 238 people · 2026
2/2 LCR
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 Rocky Hill

SupplierPopulation served
METROPOLITAN DISTRICT COMMISSION 390,887
APPLE REHAB 238

Frequently asked questions about Rocky Hill tap water

Is Rocky Hill tap water safe to drink?

EPA testing detected 19 contaminants in the water serving Rocky Hill. 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 Rocky Hill?

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

What contaminants are in Rocky Hill's water?

The contaminants EPA monitoring detected in Rocky Hill include Fluoride, Nitrate, Nitrate-Nitrite, Copper, TTHM. 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.