Is Duncannon, PA Tap Water Safe? Quality & Contaminants

What was found in Duncannon'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.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	6280 µg/L 63% of the EPA limit 10000 µg/L Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019	4/5	SYR4
Copper	562.55 µg/L 43% of the EPA limit 1300 µg/L Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019 Highest in the city: 1205 µg/L — PETERSBURG COMMONS WATER SYSTE · 100 people · 2019	5/5	SYR4
Fluoride	620 µg/L 16% of the EPA limit 4000 µg/L Highest in the city: TRANSITIONS HEALTH CARE · 150 people · 2018	2/5	SYR4
Barium	480.4 µg/L 24% of the EPA limit 2000 µg/L Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2018	3/5	SYR4
Nitrite	163 µg/L 16% of the EPA limit 1000 µg/L Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019	1/5	SYR4
TTHM	26.68 µg/L 33% of the EPA limit 80 µg/L Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019	5/5	SYR4
Chloroform	17.36 µg/L No EPA limit set Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019	5/5	SYR4
Arsenic	10.9 µg/L 109% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019 Highest in the city: 12.9 µg/L — STONEBRIDGE HEALTH & REHAB CTR · 60 people · 2019	3/5	SYR4
Lead	5.125 µg/L 34% of the EPA limit 15 µg/L Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019 Highest in the city: 7.985 µg/L — PETERSBURG COMMONS WATER SYSTE · 100 people · 2019	3/5	SYR4
Total Haloacetic Acids (HAA5)	7.1205 µg/L 12% of the EPA limit 60 µg/L Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019	4/5	SYR4
Bromodichloromethane	6.461 µg/L No EPA limit set Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019	5/5	SYR4
Monochloroacetic Acid	5.3 µg/L No EPA limit set Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019	1/5	SYR4
Selenium	4.952 µg/L 9.9% of the EPA limit 50 µg/L Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2018	1/5	SYR4
Dibromochloromethane	4.4205 µg/L No EPA limit set Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019	5/5	SYR4
Trichloroacetic Acid	3.35 µg/L No EPA limit set Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019	2/5	SYR4
Dichloroacetic Acid	3.204 µg/L No EPA limit set Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019	3/5	SYR4
Bromoform	2.14 µg/L No EPA limit set Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019	2/5	SYR4
Chromium	2.1 µg/L 2.1% of the EPA limit 100 µg/L Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2018	1/5	SYR4
Combined Uranium	2.0562 µg/L 6.9% of the EPA limit 30 µg/L Highest in the city: TRANSITIONS HEALTH CARE · 150 people · 2015	1/5	SYR4
Dibromoacetic Acid	0.8800 µg/L No EPA limit set Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2019 Highest in the city: 1 µg/L — PETERSBURG COMMONS WATER SYSTE · 100 people · 2019	2/5	SYR4
Lead	0.3010 mg/L 2007% above the EPA limit of 0.0150 mg/L Main supplier: DUNCANNON MUNI WATER · 2,000 people · 2016	4/5	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 Duncannon

Supplier	Population served
DUNCANNON MUNI WATER	2,000
SUNSHINE HILLS WATER CO	248
TRANSITIONS HEALTH CARE	150
PETERSBURG COMMONS WATER SYSTE	100
STONEBRIDGE HEALTH & REHAB CTR	60

Frequently asked questions about Duncannon tap water

Is Duncannon tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Duncannon. 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 Duncannon?

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

What contaminants are in Duncannon's water?

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