Pennsylvania tap water, by utility.

367 utilities with a full report, serving 11 million people as they report it. Regulated PFAS turned up at 133 of them.

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The 100 largest, by people served

Pennsylvania utilities, The 100 largest, by people served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
Philadelphia Water Department	Philadelphia	1,600,000	PFOA, PFOS, PFNA, PFBS	0
Aqua PA Main System	Bryn Mawr	822,600	PFOA, PFOS, PFHxS, PFNA, PFBS	2
PA Amer Water Co - Pittsburgh	Elrama	686,000	None found	1
Pittsburgh Water & Sewer Auth	Pittsburgh	520,000	None found	2
Erie City Water Authority	Erie	220,001	None found	2
York Water Co	York	206,762	None found	1
West View Water Authority	Pittsburgh	200,000	None found	2
Mawc Sweeney Plant	Greensburg	143,000	None found	2
Chester Water Authority	Chester	140,437	PFOA, PFBS	0
PA Amer Water Co Lake Scranton	Wilkes Barre	137,142	PFOA, PFOS, PFBS	0
Mawc Yough Plant	Greensburg	133,000	None found	2
Wilkinsburg - Penn Jt Water Auth	Wilkinsburg	125,000	None found	1
City of Lancaster	Lancaster	120,000	PFOA, PFBS	2
Lca Allentown Division	Allentown	118,000	PFOS, PFBS	0
City of Bethlehem	Bethlehem	117,259	None found	0
Veolia Water	Harrisburg	110,000	PFBS	0
PA American Water Co West	Mechanicsburg	105,127	PFOA, PFOS, PFBS	0
Easton Area Water System	Easton	96,867	None found	0
Reading Area Water Authority	Reading	95,100	PFOA, PFBS	4
North Penn Water Authority	Lansdale	91,941	PFOA, PFBS	0
PA American Norristown	Norristown	88,885	PFBS	0
North Wales Water Authority	North Wales	72,496	PFOA, PFOS, PFHxS, PFNA, PFBS	0
State College Boro Water Auth	State College	72,000	None found	0
Capital Region Water	Harrisburg	66,540	None found	0
Lower Bucks Co Joint Mun Auth	Levittown	63,007	None found	0
Altoona Water Authority	Altoona	62,500	None found	4
Hampton Shaler Water Authority	Allison Park	61,949	None found	0
Aqua PA Bensalem	Bryn Mawr	59,001	PFOA, PFOS, PFHxS, PFBS	0
Paw Ceasetown	Scranton	58,467	None found	0
Lebanon Water Auth	Lebanon	57,000	None found	1
Paw Nesbitt	Scranton	52,640	None found	0
Bcwsa Main Lower South	Warrington	52,621	PFOA, PFOS, PFHxS, PFBS	12
Paw Watres	Scranton	52,002	None found	0
Williamsport Mun Water Auth	Williamsport	51,000	PFOS, PFHxS, PFNA	0
PA Amer Water Co	Hummelstown	50,200	PFOA, PFBS	0
PA American Royersford	Spring City	49,508	PFOA, PFOS, PFHxS, PFBS	1
Beaver Falls Muni Auth	Beaver Falls	49,500	PFOA, PFOS, PFBS	0
Greater Johnstown WA Riverside	Johnstown	49,500	None found	0
Aqua PA West Chester	Bryn Mawr	48,600	PFOA, PFBS	0
Monroeville Municipal Auth	Monroeville	48,500	None found	2
Aqua PA Shenango Valley WTP	Sharon	48,000	None found	0
New Kensington Muni Auth	New Kensington	47,800	None found	0
Lca Wlsa Central Division	Allentown	47,693	PFOA, PFHxS, PFBS	2
Veolia Mechanicsburg	Harrisburg	45,013	PFOA, PFOS, PFBS	3
Hca Hazleton Division	Hazleton	45,000	None found	0
PA American Water Co Butler	New Castle	43,286	None found	0
PA Amer Water Co New Castle	New Castle	43,279	None found	1
Aqua PA Roaring Creek Division	Shamokin	43,000	None found	0
Cranberry Twp WTP	Cranberry Twp	42,000	None found	1
Hanover Muni Water Works	Hanover	40,900	None found	2
Southwestern PA Water Auth	Jefferson	40,200	None found	2
Northampton Boro Muni Auth	Northampton	40,000	None found	0
Oakmont Water Authority	Oakmont	39,901	None found	0
Newtown Artesian Water Co	Newtown	38,500	PFOA, PFOS, PFBS	0
Moon Twp Muni Auth	Moon Township	38,000	PFOS, PFHxS	1
Penn State Univ	University Park	37,000	None found	0
PA American Coatesville	Coatesville	36,960	None found	0
Northampton Bucks Co Mun Auth	Richboro	36,750	PFOA, PFOS, PFHxS, PFNA, PFBS	2
Pottstown Borough Water Auth	Pottstown	36,000	PFBS	2
Warminster Municipal Authority	Warminster	36,000	None found	0
Aqua PA Uwchlan	Bryn Mawr	35,518	PFOA, PFOS, PFBS	0
North Fayette Cnty Muni Auth	Dunbar	35,409	None found	0
PA American Water Co Yardley	Yardley	33,171	PFOA, PFOS, PFBS	1
West Cnty Muni Auth - McKeesport	Greensburg	32,644	None found	0
Schuylkill Co Mun Auth	Pottsville	31,850	None found	1
Chambersburg Boro Water Sys	Chambersburg	31,048	None found	0
PA American White Deer	Mechanicsburg	30,209	None found	0
Brodhead Creek Reg Water Auth	East Stroudsburg	30,000	None found	0
Latrobe Muni Auth	Latrobe	30,000	None found	2
Mifflin Cnty Muni Auth	Milroy	29,432	None found	0
Veolia Water PA Inc Bloomsburg	Bloomsburg	29,382	None found	0
Aqua PA Bristol	Bryn Mawr	28,727	PFOA	0
Paw Penn District	Reading	28,508	PFOA, PFOS, PFHxS, PFBS	0
Guilford Water Auth	Chambersburg	28,135	None found	2
Plum Boro Muni Auth	Pittsburgh	27,500	None found	1
Auth of Boro of Charleroi	Charleroi	27,000	None found	6
Carlisle Water Trmt Plt	Carlisle	26,000	PFOA, PFOS, PFBS	0
Horsham Water&Sewer Authority	Horsham	26,000	PFOA, PFOS, PFHxS, PFBS	1
Columbia Water Co	Columbia	25,200	None found	3
Paw Glen Alsace Div	Mechanicsburg	24,951	PFOA, PFOS, PFHxS, PFBS	1
Ephrata Area Joint Authority	Ephrata	24,500	PFOA, PFOS, PFHxS, PFBS	0
Falls Twp Water & Sewer Dept	Fairless Hills	24,400	None found	1
Paw Blue Mountain Division	Clarks Summit	23,763	None found	0
PA - American Water - Uniontown	Uniontown	23,125	None found	0
Highland S & W Auth Beaverdam	Johnstown	22,617	None found	3
Muhlenberg Twp Muni Auth	Reading	22,400	PFOA, PFOS, PFHxS, PFNA, PFBS	1
PA American Water Co - Indiana D	New Castle	22,360	None found	0
Nwwa Warrington Township	North Wales	21,588	None found	3
Dover Twp Water Sys	Dover	21,097	PFOA, PFOS, PFBS	1
East Hempfield Water Auth	Landisville	20,988	PFOA, PFOS, PFBS	1
Paw Philipsburg	Philipsburg	20,865	None found	0
Ambler Boro Water Dept	Ambler	20,000	PFOA, PFOS, PFHxS, PFNA, PFBS	0
St Marys Area Water Auth	Saint Marys	19,588	None found	1
Ambridge Water Auth	Ambridge	19,500	None found	2
Western Allegheny County Mun A	Oakdale	19,031	PFOS, PFHxS	2
Center Twp Water Auth	Aliquippa	19,000	None found	3
Elizabethtown Area Water	Elizabethtown	19,000	PFOS, PFBS	1
Bradford City Water Authority	Bradford	18,500	None found	2
Fox Chapel Auth	Pittsburgh	18,500	None found	0
Pawc Pocono District	Tobyhanna	17,860	PFOA, PFOS, PFBS	0

Utilities EPA sampled under UCMR 5, plus any other community system serving 3,300 people or more. Smaller systems appear in ZIP code results. People served is what each utility reports to EPA. Data: EPA SDWIS 2026 Q2 and UCMR 5.