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Tap water quality report

Denver, PA

EPA monitoring detected 29 contaminants across the 2 water suppliers serving Denver. 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
10,596
people served
29
contaminants found
Pennsylvania rankings Lead in Pennsylvania PFAS in Pennsylvania

What was found in Denver'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
8790 µg/L 88%
of the EPA limit 10000 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
2/2 SYR4
Fluoride
1087.5 µg/L 27%
of the EPA limit 4000 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2018
1/2 SYR4
Copper
753 µg/L 58%
of the EPA limit 1300 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
Highest in the city: 950 µg/L — DENVER BORO · 3,861 people · 2019
2/2 SYR4
Barium
651.5 µg/L 33%
of the EPA limit 2000 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2018
2/2 SYR4
TTHM
37.95 µg/L 47%
of the EPA limit 80 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
2/2 SYR4
Chloroform
30.35 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
2/2 SYR4
Lithium
25.7 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2024
2/2 UCMR-5
Lead
22.3 µg/L 149%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
8.534 µg/L 14%
of the EPA limit 60 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
Highest in the city: 13.02 µg/L — DENVER BORO · 3,861 people · 2019
2/2 SYR4
Dichloroacetic Acid
5.5165 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
Highest in the city: 10.86 µg/L — DENVER BORO · 3,861 people · 2019
2/2 SYR4
Bromodichloromethane
8.55 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
2/2 SYR4
Dibromochloromethane
7.525 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
2/2 SYR4
Combined Uranium
4.9237 µg/L 16%
of the EPA limit 30 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2017
2/2 SYR4
Arsenic
4.915 µg/L 49%
of the EPA limit 10 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2018
2/2 SYR4
Trichloroacetic Acid
2.3405 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
Highest in the city: 4.624 µg/L — DENVER BORO · 3,861 people · 2019
2/2 SYR4
Trichloroethylene
3.6 µg/L 72%
of the EPA limit 5 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
1/2 SYR4
Chromium
3.285 µg/L 3.3%
of the EPA limit 100 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2018
2/2 SYR4
1,1-Dichloroethylene
2.5 µg/L 36%
of the EPA limit 7 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
1/2 SYR4
Bromoform
2.3 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
Highest in the city: 2.495 µg/L — DENVER BORO · 3,861 people · 2019
2/2 SYR4
Dibromoacetic Acid
1.2 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
Highest in the city: 2.178 µg/L — DENVER BORO · 3,861 people · 2019
2/2 SYR4
Tetrachloroethylene
1.8 µg/L 36%
of the EPA limit 5 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
1/2 SYR4
1,1,1-Trichloroethane
0.5000 µg/L 0.3%
of the EPA limit 200 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
1/2 SYR4
Xylenes, Total
0.5000 µg/L 0%
of the EPA limit 10000 µg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2019
1/2 SYR4
PFBS
0.0056 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2024
2/2 UCMR-5
PFOS
0.0049 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2024
1/2 UCMR-5
PFOA
0.0045 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2024
1/2 UCMR-5
Pfpea
0.0039 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2024
2/2 UCMR-5
Pfhxa
0.0032 µg/L
No EPA limit set
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2024
1/2 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: EAST COCALICO TOWNSHIP AUTH · 6,735 people · 2025
Highest in the city: 0.0015 mg/L — DENVER BORO · 3,861 people · 2025
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 Denver

SupplierPopulation served
EAST COCALICO TOWNSHIP AUTH 6,735
DENVER BORO 3,861

Frequently asked questions about Denver tap water

Is Denver tap water safe to drink?

EPA testing detected 29 contaminants in the water serving Denver. 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 Denver?

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

What contaminants are in Denver's water?

The contaminants EPA monitoring detected in Denver include Nitrate, Fluoride, Copper, Barium, 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.