Is Williamsport, PA Tap Water Safe? Quality & Contaminants

What was found in Williamsport's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	3590 µg/L 36% of the EPA limit 10000 µg/L	4/5	SYR4
Barium	1960 µg/L 98% of the EPA limit 2000 µg/L	5/5	SYR4
Fluoride	900 µg/L 23% of the EPA limit 4000 µg/L	3/5	SYR4
Copper	898 µg/L 69% of the EPA limit 1300 µg/L	5/5	SYR4
TTHM	78.4 µg/L 98% of the EPA limit 80 µg/L	4/5	SYR4
Chloroform	67.3 µg/L No EPA limit set	4/5	SYR4
Lithium	45.6 µg/L No EPA limit set	1/5	UCMR-5
Total Haloacetic Acids (HAA5)	33.4 µg/L 56% of the EPA limit 60 µg/L	2/5	SYR4
Lead	30.6 µg/L 204% of the EPA limit, in the worst sample — 15 µg/L	5/5	SYR4
Bromodichloromethane	19.2 µg/L No EPA limit set	3/5	SYR4
Dichloroacetic Acid	13.3 µg/L No EPA limit set	1/5	SYR4
Trichloroacetic Acid	12.1 µg/L No EPA limit set	1/5	SYR4
Dibromochloromethane	10.4 µg/L No EPA limit set	3/5	SYR4
Bromoform	4.92 µg/L No EPA limit set	2/5	SYR4
Chromium	4.9 µg/L 4.9% of the EPA limit 100 µg/L	4/5	SYR4
Monochloroacetic Acid	1.37 µg/L No EPA limit set	1/5	SYR4
Dibromoacetic Acid	1.3 µg/L No EPA limit set	1/5	SYR4
Arsenic	1.02 µg/L 10% of the EPA limit 10 µg/L	3/5	SYR4
Xylenes, Total	0.5200 µg/L 0% of the EPA limit 10000 µg/L	1/5	SYR4
PFNA	0.0097 µg/L No EPA limit set	1/5	UCMR-5
Lead	0.0060 mg/L 40% of the EPA limit 0.0150 mg/L	5/5	LCR
PFOS	0.0051 µg/L No EPA limit set	1/5	UCMR-5
Pfpea	0.0041 µg/L No EPA limit set	1/5	UCMR-5
PFHXS	0.0036 µg/L No EPA limit set	1/5	UCMR-5
Pfhxa	0.0035 µg/L No EPA limit set	1/5	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 single worst sample on record — 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 Williamsport

Supplier	Population served
WILLIAMSPORT MUN WATER AUTH	51,000
OAK LYNN MANOR MOBILE HOME PK	250
COLLOMSVILLE MUTUAL WATERWORKS	250
FOXCROFT MANOR MOBILE HOME PK	200
AMERICAN TEMPO VILLAGE PARK	88

Frequently asked questions about Williamsport tap water

Is Williamsport tap water safe to drink?

EPA testing detected 25 contaminants in the water serving Williamsport. 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 Williamsport?

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

What contaminants are in Williamsport's water?

The contaminants EPA monitoring detected in Williamsport include Nitrate, Barium, Fluoride, Copper, TTHM. The full list, with the highest level found 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.