PFAS in Pennsylvania drinking water
Highest: Collegeville Trappe Joint PWD, 253.1 ng/L PFAS-4.
360 community water systems · 10,584,045 people served · newest sample April 9, 2026
Highest PFAS-4 in Pennsylvania
Ranked by the PFAS-4 sum in each system's headline sample. The pill flags PFOA or PFOS above the 2029 federal MCL.
Collegeville Trappe Joint PWD
253.1 ng/L PFAS-4 · 8,470 people PFOA or PFOS above the 2029 federal MCL
Emmaus Borough Public Water
213.2 ng/L PFAS-4 · 14,000 people PFOA or PFOS above the 2029 federal MCL
Palmerton Municipal Authority
114 ng/L PFAS-4 · 7,000 people PFOA or PFOS above the 2029 federal MCL
PA American Audubon
71.3 ng/L PFAS-4 · 8,200 people PFOA or PFOS above the 2029 federal MCL
Horsham Water&sewer Authority
61.9 ng/L PFAS-4 · 26,000 people PFOA or PFOS above the 2029 federal MCL
Caernarvon TWP Auth
47.8 ng/L PFAS-4 · 4,245 people PFOA or PFOS above the 2029 federal MCL
Northampton Bucks CO Mun Auth
44.2 ng/L PFAS-4 · 36,750 people PFOA or PFOS above the 2029 federal MCL
Buckingham TWP Cold Spring
41.3 ng/L PFAS-4 · 4,760 people PFOA or PFOS above the 2029 federal MCL
Quakertown Boro
40.7 ng/L PFAS-4 · 12,800 people PFOA or PFOS above the 2029 federal MCL
Beaver Boro Muni Auth
40.1 ng/L PFAS-4 · 5,799 people PFOA or PFOS above the 2029 federal MCL
Ambler Boro Water Dept
38.8 ng/L PFAS-4 · 20,000 people PFOA or PFOS above the 2029 federal MCL
Aqua PA Hatboro
38 ng/L PFAS-4 · 12,901 people PFOA or PFOS above the 2029 federal MCL
Upper Southampton Mun Auth
35.3 ng/L PFAS-4 · 16,000 people PFOA or PFOS above the 2029 federal MCL
Doylestown Boro Water Dept
33.8 ng/L PFAS-4 · 8,700 people PFOA or PFOS above the 2029 federal MCL
PAW Penn District
33.1 ng/L PFAS-4 · 28,508 people PFOA or PFOS above the 2029 federal MCL
Counties (65)
Adams County 3 Allegheny County 26 Armstrong County 5 Beaver County 11 Bedford County 3 Berks County 19 Blair County 3 Bradford County 2 Bucks County 23 Butler County 8 Cambria County 10 Cameron County 1 Carbon County 3 Centre County 8 Chester County 11 Clarion County 1 Clearfield County 6 Clinton County 2 Columbia County 3 Crawford County 3 Cumberland County 9 Dauphin County 6 Delaware County 2 Elk County 2 Erie County 12 Fayette County 11 Forest County 1 Franklin County 7 Greene County 2 Huntingdon County 2 Indiana County 4 Jefferson County 3 Juniata County 1 Lackawanna County 2 Lancaster County 19 Lawrence County 3 Lebanon County 2 Lehigh County 10 Luzerne County 9 Lycoming County 4 McKean County 2 Mercer County 5 Mifflin County 1 Monroe County 6 Montgomery County 15 Montour County 1 Northampton County 8 Northumberland County 3 Perry County 1 Philadelphia County 1 Pike County 3 Potter County 1 Schuylkill County 11 Snyder County 2 Somerset County 6 Susquehanna County 1 Tioga County 2 Union County 1 Venango County 3 Warren County 1 Washington County 3 Wayne County 2 Westmoreland County 5 Wyoming County 2 York County 12
Other water systems in Pennsylvania (345)
Largest first. "Not detected" means below the 3 to 4 ng/L reporting limits, not zero.
Philadelphia Water Department
1,600,000 people PFOA or PFOS above the 2029 federal MCL
Aqua PA Main System
822,600 people PFOA or PFOS above the 2029 federal MCL
PA Amer Water CO-Pittsburgh
686,000 people PFAS-4 not detected
Pittsburgh Water & Sewer Auth
520,000 people PFAS-4 not detected
Erie City Water Authority
220,001 people PFAS-4 not detected
York Water CO
206,762 people PFAS-4 not detected
West View Water Authority
200,000 people PFAS-4 not detected
Mawc Sweeney Plant
143,000 people PFAS-4 not detected
Chester Water Authority
140,437 people PFAS-4 not detected
PA Amer Water CO Lake Scranton
137,142 people PFOA or PFOS above the 2029 federal MCL
Mawc Yough Plant
133,000 people PFAS-4 not detected
Wilkinsburg-Penn Jt Water Auth
125,000 people PFAS-4 not detected
City of Lancaster
120,000 people PFOA or PFOS above the 2029 federal MCL
Lca Allentown Division
118,000 people PFOA or PFOS above the 2029 federal MCL
City of Bethlehem
117,259 people PFAS-4 not detected
Veolia Water
110,000 people PFAS-4 not detected
PA American Water CO West
105,127 people PFOA or PFOS above the 2029 federal MCL
Easton Area Water System
96,867 people PFAS-4 not detected
Reading Area Water Authority
95,100 people PFOA or PFOS above the 2029 federal MCL
North Penn Water Authority
91,941 people PFOA or PFOS above the 2029 federal MCL
PA American Norristown
88,885 people PFAS-4 not detected
North Wales Water Authority
72,496 people PFOA or PFOS above the 2029 federal MCL
State College Boro Water Auth
72,000 people PFAS-4 not detected
Capital Region Water
66,540 people PFAS-4 not detected
Lower Bucks CO Joint Mun Auth
63,007 people PFAS-4 not detected
Altoona Water Authority
62,500 people PFAS-4 not detected
Hampton Shaler Water Authority
61,949 people PFAS-4 not detected
Aqua PA Bensalem
59,001 people PFOA or PFOS above the 2029 federal MCL
PAW Ceasetown
58,467 people PFAS-4 not detected
Lebanon Water Auth
57,000 people PFAS-4 not detected
PAW Nesbitt
52,640 people PFAS-4 not detected
Bcwsa Main Lower South
52,621 people PFOA or PFOS above the 2029 federal MCL
PAW Watres
52,002 people PFAS-4 not detected
Williamsport Mun Water Auth
51,000 people PFAS-4 quantified
PA Amer Water CO
50,200 people PFAS-4 not detected
PA American Royersford
49,508 people PFOA or PFOS above the 2029 federal MCL
Beaver Falls Muni Auth
49,500 people PFAS-4 not detected
Greater Johnstown WA Riverside
49,500 people PFAS-4 not detected
Aqua PA West Chester
48,600 people PFAS-4 not detected
Monroeville Municipal Auth
48,500 people PFAS-4 not detected
Aqua PA Shenango Valley WTP
48,000 people PFAS-4 not detected
New Kensington Muni Auth
47,800 people PFAS-4 not detected
Lca Wlsa Central Division
47,693 people PFOA or PFOS above the 2029 federal MCL
Veolia Mechanicsburg
45,013 people PFOA or PFOS above the 2029 federal MCL
Hca Hazleton Division
45,000 people PFAS-4 not detected
PA American Water CO Butler
43,286 people PFAS-4 not detected
PA Amer Water CO New Castle
43,279 people PFAS-4 not detected
Aqua PA Roaring Creek Division
43,000 people PFAS-4 not detected
Cranberry TWP WTP
42,000 people PFAS-4 not detected
Hanover Muni Water Works
40,900 people PFAS-4 not detected
Southwestern PA Water Auth
40,200 people PFAS-4 not detected
Northampton Boro Muni Auth
40,000 people PFAS-4 not detected
Oakmont Water Authority
39,901 people PFAS-4 not detected
Newtown Artesian Water CO
38,500 people PFOA or PFOS above the 2029 federal MCL
Moon TWP Muni Auth
38,000 people PFOA or PFOS above the 2029 federal MCL
Penn State Univ
37,000 people PFAS-4 not detected
PA American Coatesville
36,960 people PFAS-4 not detected
Pottstown Borough Water Auth
36,000 people PFAS-4 not detected
Warminster Municipal Authority
36,000 people PFAS-4 not detected
Aqua PA Uwchlan
35,518 people PFOA or PFOS above the 2029 federal MCL
North Fayette Cnty Muni Auth
35,409 people PFAS-4 not detected
PA American Water CO Yardley
33,171 people PFOA or PFOS above the 2029 federal MCL
West Cnty Muni Auth-Mckeesport
32,644 people PFAS-4 not detected
Schuylkill CO Mun Auth
31,850 people PFAS-4 not detected
Chambersburg Boro Water Sys
31,048 people PFAS-4 not detected
PA American White Deer
30,209 people PFAS-4 not detected
Brodhead Creek Reg Water Auth
30,000 people PFAS-4 not detected
Latrobe Muni Auth
30,000 people PFAS-4 not detected
Mifflin Cnty Muni Auth
29,432 people PFAS-4 not detected
Veolia Water PA INC Bloomsburg
29,382 people PFAS-4 not detected
Aqua PA Bristol
28,727 people PFAS-4 not detected
Guilford Water Auth
28,135 people PFAS-4 not detected
Plum Boro Muni Auth
27,500 people PFAS-4 not detected
Auth of Boro of Charleroi
27,000 people PFAS-4 not detected
Carlisle Water Trmt Plt
26,000 people PFOA or PFOS above the 2029 federal MCL
Columbia Water CO
25,200 people PFAS-4 not detected
PAW Glen Alsace Div
24,951 people PFOA or PFOS above the 2029 federal MCL
Ephrata Area Joint Authority
24,500 people PFOA or PFOS above the 2029 federal MCL
Falls TWP Water & Sewer Dept
24,400 people PFAS-4 not detected
PAW Blue Mountain Division
23,763 people PFAS-4 not detected
PA-American Water- Uniontown
23,125 people PFAS-4 not detected
Highland S & W Auth Beaverdam
22,617 people PFAS-4 not detected
Muhlenberg TWP Muni Auth
22,400 people PFOA or PFOS above the 2029 federal MCL
PA American Water CO-Indiana D
22,360 people PFAS-4 not detected
Nwwa Warrington Township
21,588 people PFAS-4 not detected
Dover TWP Water Sys
21,097 people PFOA or PFOS above the 2029 federal MCL
East Hempfield Water Auth
20,988 people PFOA or PFOS above the 2029 federal MCL
PAW Philipsburg
20,865 people PFAS-4 not detected
St Marys Area Water Auth
19,588 people PFAS-4 not detected
Ambridge Water Auth
19,500 people PFAS-4 not detected
Western Allegheny County Mun A
19,031 people PFOA or PFOS above the 2029 federal MCL
Center TWP Water Auth
19,000 people PFAS-4 not detected
Elizabethtown Area Water
19,000 people PFOA or PFOS above the 2029 federal MCL
Bradford City Water Authority
18,500 people PFAS-4 not detected
Fox Chapel Auth
18,500 people PFAS-4 not detected
Pawc Pocono District
17,860 people PFOA or PFOS above the 2029 federal MCL
Shippensburg Boro Water Auth
17,800 people PFAS-4 not detected
Meadville Area Water Authority
17,339 people PFAS-4 not detected
PA Amer Water CO Ellwood Cty
17,200 people PFAS-4 not detected
Phoenixville Water Dept
16,599 people PFOA or PFOS above the 2029 federal MCL
Robinson TWP Muni Auth
16,354 people PFAS-4 not detected
Highridge Water Auth
16,000 people PFOA or PFOS above the 2029 federal MCL
Red Lion Municipal Authority
15,882 people PFAS-4 not detected
Slippery Rock Muni Auth
15,778 people PFAS-4 not detected
Mun Water Auth of Aliquippa
15,685 people PFAS-4 not detected
Aqua PA Susquehanna Division
15,569 people PFAS-4 not detected
PA American Water Berwick
15,282 people PFOA or PFOS above the 2029 federal MCL
Mt Joy Boro Auth
15,261 people PFAS-4 not detected
Creswell Heights Jt Auth
15,000 people PFAS-4 not detected
Perkasie Regional Authority
15,000 people PFOA or PFOS above the 2029 federal MCL
Warwick TWP Water & Sewer Auth
14,699 people PFOA or PFOS above the 2029 federal MCL
PA American Water CO Warren
14,650 people PFAS-4 not detected
Swt Main System
14,500 people PFAS-4 not detected
Kutztown Borough Water
14,200 people PFAS-4 not detected
Clearfield Municipal Auth
14,000 people PFAS-4 not detected
Huntingdon Boro Water Dept
13,776 people PFAS-4 not detected
Harrison TWP Water Auth
13,411 people PFAS-4 not detected
Morrisville Munic Authority
13,342 people PFAS-4 not detected
Shillington Muni Auth
13,300 people PFAS-4 not detected
Boro of Waynesboro
13,200 people PFAS-4 not detected
Whitehall TWP Authority
13,063 people PFOA or PFOS above the 2029 federal MCL
E Stroudsburg Boro Water Dept
13,000 people PFAS-4 not detected
Bear Valley Joint Auth
12,589 people PFAS-4 not detected
PA Amer Water CO Brownell
12,560 people PFAS-4 not detected
Summit Township Water Authorit
12,500 people PFAS-4 not detected
Gettysburg Muni Auth
12,425 people PFOA or PFOS above the 2029 federal MCL
Dallastown Yoe Water Auth
12,300 people PFAS-4 not detected
PAW Huntsville
11,987 people PFAS-4 not detected
South Middleton TWP Water Auth
11,695 people PFAS-4 not detected
Findlay TWP Municipal Auth
11,460 people PFAS-4 not detected
PA-American Water CO-Connellsv
11,425 people PFAS-4 not detected
Aqua PA Superior Main System
11,400 people PFOA or PFOS above the 2029 federal MCL
Municipal Authority Sunbury
11,043 people PFAS-4 not detected
Mt Penn Boro Muni Auth
10,400 people PFAS-4 not detected
PA American Water CO Clarion
10,372 people PFAS-4 not detected
Richland TWP Water Authority
10,190 people PFAS-4 not detected
Tri Cnty Jt Muni Auth
10,100 people PFAS-4 not detected
City of Lock Haven Water Dept
10,000 people PFAS-4 not detected
West Manchester TWP Auth
9,960 people PFOA or PFOS above the 2029 federal MCL
Downingtown Water Authority
9,900 people PFAS-4 not detected
PAW Crystal Lake
9,773 people PFAS-4 not detected
Suburban Lock Haven Water Auth
9,700 people PFAS-4 not detected
Icmsa Crooked Creek
9,638 people PFAS-4 not detected
Oil City
9,608 people PFAS-4 not detected
Veolia Middletown
9,600 people PFOA or PFOS above the 2029 federal MCL
Aqua Shenandoah
9,500 people PFAS-4 not detected
Bellefonte Borough Water Auth
9,500 people PFAS-4 not detected
Myerstown Water Auth
9,500 people PFAS-4 not detected
Windber Area Auth
9,463 people PFAS-4 not detected
Lititz Boro
9,397 people PFAS-4 not detected
Lansford Coaldale Jt Water Aut
9,300 people PFAS-4 not detected
Muni Auth of Washington TWP
9,100 people PFAS-4 not detected
General Authority of Franklin
9,096 people PFAS-4 not detected
PAW Bangor District
9,008 people PFAS-4 not detected
Lehighton Water Authority
9,000 people PFAS-4 not detected
Dillsburg Area Authority
8,962 people PFOA or PFOS above the 2029 federal MCL
Aqua PA Friendship
8,800 people PFOA or PFOS above the 2029 federal MCL
Municipal Water Auth Adams TWP
8,700 people PFAS-4 not detected
Dtma Main System
8,655 people PFOA or PFOS above the 2029 federal MCL
Aqua PA Greenville
8,600 people PFAS-4 not detected
Warwick TWP Lititz Sys
8,561 people PFAS-4 not detected
Hollidaysburg Muni Auth
8,523 people PFAS-4 not detected
Salisbury TWP Water System
8,522 people PFOA or PFOS above the 2029 federal MCL
Ebensburg Boro Muni Auth
8,500 people PFAS-4 not detected
Wyomissing Boro Water System
8,500 people PFAS-4 not detected
New Holland Borough
8,490 people PFOA or PFOS above the 2029 federal MCL
N Middleton Water Auth
8,455 people PFOA or PFOS above the 2029 federal MCL
PA American Water Punxsy
8,419 people PFAS-4 not detected
Houtzdale Municipal Authority
8,410 people PFAS-4 not detected
Hemlock Farms (Main)
8,321 people PFAS-4 not detected
Wellsboro Municipal Authority
8,225 people PFAS-4 not detected
Aqua PA Spring Run
8,151 people PFOA or PFOS above the 2029 federal MCL
Boyertown Muni Auth
8,000 people PFAS-4 not detected
Kittanning Suburb Jt Water Aut
8,000 people PFAS-4 not detected
Tamaqua Area Water Authority
8,000 people PFAS-4 not detected
Millersville Univ
7,950 people PFOA or PFOS above the 2029 federal MCL
Brighton TWP Muni Auth
7,920 people PFAS-4 quantified
Wernersville Muni Water Auth
7,920 people PFAS-4 not detected
Grove City Boro Water Dept
7,871 people PFAS-4 not detected
PA-American Water-Brownsville
7,844 people PFAS-4 not detected
Veolia Water Bethel
7,809 people PFAS-4 not detected
Conemaugh TWP Muni Auth
7,800 people PFAS-4 not detected
Edinboro Water Authority
7,800 people PFAS-4 not detected
Municipal Authority of Corry
7,800 people PFAS-4 not detected
City of Dubois Water Depart
7,794 people PFAS-4 not detected
Edgeworth Boro Muni Auth
7,781 people PFAS-4 not detected
Upper Leacock Township
7,734 people PFOA or PFOS above the 2029 federal MCL
Telford Borough Authority
7,700 people PFOA or PFOS above the 2029 federal MCL
Veolia Water PA Dallas
7,563 people PFOA or PFOS above the 2029 federal MCL
Maidencreek TWP Water Auth
7,505 people PFAS-4 not detected
Littlestown Boro
7,300 people PFOA or PFOS above the 2029 federal MCL
Upper Saucon TWP Water Supply
7,300 people PFAS-4 not detected
Minersville Municipal Water Au
7,275 people PFAS-4 not detected
Blythe TWP Municipal Authority
7,100 people PFAS-4 not detected
Womelsdorf Robesonia Jt Auth
7,070 people PFAS-4 not detected
Pawc Saw Creek Estates
7,016 people PFAS-4 not detected
Indian Creek Valley Water Auth
7,000 people PFAS-4 not detected
Richland TWP Water Authority
6,800 people PFOA or PFOS above the 2029 federal MCL
Sewickley Boro Water Auth
6,800 people PFAS-4 quantified
Neville TWP Water Dept
6,750 people PFAS-4 not detected
Manor TWP Jt Muni Auth
6,744 people PFAS-4 not detected
East Cocalico Township Auth
6,735 people PFOA or PFOS above the 2029 federal MCL
Manheim Area Water & Sewer Aut
6,701 people PFOA or PFOS above the 2029 federal MCL
Kline Township Mun Authority
6,700 people PFAS-4 not detected
Harmony Boro Water Auth
6,669 people PFAS-4 not detected
Jersey Shore Area Jnt Wat Auth
6,600 people PFAS-4 not detected
Catasauqua Mun Water Works
6,598 people PFAS-4 quantified
Aqua PA Fawn Lake Forest
6,533 people PFAS-4 not detected
Derry Boro Muni Auth
6,500 people PFAS-4 not detected
Monaca Boro Water Dept
6,500 people PFAS-4 quantified
Portage Boro Muni Auth
6,500 people PFAS-4 not detected
Tyrone Boro Water Auth
6,500 people PFAS-4 not detected
Veolia Newberry System
6,480 people PFOA or PFOS above the 2029 federal MCL
PA American Water Steelton
6,428 people PFAS-4 not detected
Kennett Square Mun Water Works
6,328 people PFAS-4 not detected
Somerset Boro Muni Water Auth
6,309 people PFAS-4 not detected
Brookville Municipal Auth
6,220 people PFAS-4 not detected
East Petersburg Borough
6,215 people PFOA or PFOS above the 2029 federal MCL
Titusville Municipal Water
6,146 people PFOA or PFOS above the 2029 federal MCL
Washington TWP Muni Auth
6,134 people PFAS-4 not detected
Belle Vernon Boro Muni Auth
6,000 people PFAS-4 not detected
College TWP Water Authority
6,000 people PFAS-4 not detected
Schuylkill Haven Boro Water
6,000 people PFAS-4 not detected
Aqua PA Chalfont
5,900 people PFAS-4 not detected
Buffalo TWP Mun Auth Freeport
5,849 people PFAS-4 not detected
Albion Borough
5,842 people PFAS-4 not detected
Coraopolis Water & Sewer Auth
5,804 people PFAS-4 not detected
Mt Union Municipal Auth
5,801 people PFAS-4 not detected
Hellertown Borough Authority
5,800 people PFAS-4 not detected
Hilltown TWP Water&sewer Auth
5,770 people PFOA or PFOS above the 2029 federal MCL
PA American Water CO Kane
5,725 people PFAS-4 not detected
Lower Saucon Authority
5,700 people PFAS-4 not detected
Mahanoy TWP Auth
5,584 people PFAS-4 not detected
Selinsgrove Muni Auth
5,584 people PFAS-4 not detected
PA Amer Water CO Frackville
5,583 people PFAS-4 not detected
Duquesne Water Dept
5,565 people PFAS-4 not detected
Aqua PA Water CO Honesdale
5,500 people PFAS-4 not detected
Greencastle Area Water Auth
5,500 people PFAS-4 not detected
Birdsboro Muni Water Auth
5,353 people PFAS-4 not detected
Tunkhannock Boro Munic Auth
5,349 people PFOA or PFOS above the 2029 federal MCL
Oxford Borough
5,280 people PFOA or PFOS above the 2029 federal MCL
Stewartstown Boro Water Auth
5,206 people PFOA or PFOS above the 2029 federal MCL
Schwenksville Borough Auth
5,200 people PFOA or PFOS above the 2029 federal MCL
Mun Auth of Boro of Bedford
5,127 people PFAS-4 not detected
Aqua PA Flying Hills WA Sys
5,100 people PFOA or PFOS above the 2029 federal MCL
Sharpsville Boro Water CO
5,029 people PFAS-4 not detected
Towanda Municipal Authority
5,000 people PFAS-4 not detected
Danville Municipal Water Auth
4,992 people PFAS-4 not detected
Hamburg Muni Water&sewer Auth
4,990 people PFAS-4 not detected
Montoursville Water Company
4,983 people PFOA or PFOS above the 2029 federal MCL
Tarentum Boro Water Dept
4,927 people PFAS-4 not detected
Central Indiana CO Water Auth
4,920 people PFAS-4 not detected
London Grove TWP Mun Auth
4,770 people PFAS-4 not detected
Shrewsbury Borough
4,727 people PFOA or PFOS above the 2029 federal MCL
Ridgway Borough Water System
4,700 people PFAS-4 not detected
Fawn Frazer Jt Water Auth
4,650 people PFAS-4 not detected
Freeland Boro Muni Water Auth
4,610 people PFOA or PFOS above the 2029 federal MCL
North East Borough Water Dept
4,601 people PFAS-4 not detected
Millersburg Water Auth
4,600 people PFOA or PFOS above the 2029 federal MCL
Upper Hanover Water Authority
4,600 people PFAS-4 not detected
North Sewickley Mun Water Auth
4,578 people PFAS-4 not detected
Fairview TWP Water District 1
4,500 people PFAS-4 not detected
New Wilmington Boro Water Dept
4,500 people PFAS-4 not detected
Northern Cambria Muni Water
4,500 people PFAS-4 not detected
Pike TWP Municipal Authority
4,500 people PFAS-4 not detected
Seneca & Cranberry Mall Dist
4,500 people PFAS-4 not detected
PA American Water Kittanning
4,499 people PFAS-4 not detected
Milford TWP Water Authority
4,497 people PFAS-4 quantified
New Freedom Boro Water Auth
4,464 people PFAS-4 not detected
Mifflintown Muni Auth
4,450 people PFAS-4 not detected
Slatington Borough Water Sys
4,450 people PFAS-4 not detected
Franklin System York Water
4,400 people PFAS-4 not detected
Southwestern Cambria Cnty Auth
4,400 people PFAS-4 not detected
Brockway Boro Municipal Auth
4,384 people PFAS-4 not detected
West Earl Water Authority
4,327 people PFAS-4 not detected
Aqua PA Jenks TWP WTP
4,320 people PFAS-4 not detected
Penn Estates Utilities Incorp
4,300 people PFAS-4 not detected
West Reading Boro Water
4,300 people PFAS-4 not detected
Union City Municipal Authority
4,295 people PFAS-4 not detected
New Sewickley TWP Muni Auth
4,276 people PFAS-4 not detected
PA Amer Water CO Susquehanna
4,230 people PFAS-4 not detected
Fleetwood Boro Water System
4,218 people PFAS-4 not detected
Akron Borough
4,200 people PFAS-4 not detected
Ashland Area Water Authority
4,200 people PFOA or PFOS above the 2029 federal MCL
PA American Dilliner System
4,200 people PFAS-4 not detected
Aqua PA INC Treasure Lake Div
4,155 people PFAS-4 not detected
Zelienople Boro
4,123 people PFAS-4 not detected
Mansfield Borough Mun Auth
4,100 people PFAS-4 not detected
Wrightsville Boro Muni Auth
4,076 people PFAS-4 not detected
East Donegal
4,048 people PFAS-4 not detected
Blairsville Muni Auth
4,023 people PFAS-4 not detected
New Oxford Munci Auth
3,963 people PFOA or PFOS above the 2029 federal MCL
Baden Boro Water Dept
3,948 people PFAS-4 not detected
Hegins Hubley Authority
3,870 people PFAS-4 not detected
Denver Boro
3,861 people PFAS-4 not detected
Mountain Water Assn
3,856 people PFAS-4 not detected
Masontown Muni Water Works
3,841 people PFAS-4 not detected
Somerset TWP Muni Auth Oakridg
3,800 people PFAS-4 not detected
Tobyhanna Army Depot
3,800 people PFAS-4 not detected
Roamingwood Sewer and Water
3,775 people PFAS-4 not detected
Masonic Homes
3,707 people PFOA or PFOS above the 2029 federal MCL
Brackenridge Boro Water Dept
3,700 people PFAS-4 not detected
Cooper TWP Municipal Auth
3,700 people PFAS-4 not detected
Mifflinburg Boro Water Dept
3,690 people PFAS-4 not detected
Pleasant Valley Water Auth
3,630 people PFAS-4 not detected
Aqua PA Perkiomen Township
3,600 people PFOA or PFOS above the 2029 federal MCL
Middlesex TWP Muni Auth
3,527 people PFAS-4 not detected
State Correctional Inst
3,500 people PFAS-4 not detected
Springdale Boro Water Dept
3,405 people PFAS-4 not detected
Fairview TWP Water Auth Dist 3
3,320 people PFAS-4 not detected
Girard Boro Water Dept
3,301 people PFAS-4 not detected
Emporium Water Company
3,300 people PFAS-4 not detected
Spring TWP Water Authority
3,300 people PFAS-4 quantified
Reserve TWP Water Dept
3,204 people PFAS-4 not detected
Glendale Valley Municipal Auth
3,200 people PFAS-4 not detected
Coudersport Boro Authority
3,166 people PFAS-4 not detected
Nanty Glo Water Auth
3,152 people PFAS-4 not detected
Seven Springs Muni Auth
3,000 people PFAS-4 not detected
Lca North Whitehall Division
2,910 people PFAS-4 not detected
State Corr Inst Benner TWP
2,850 people PFAS-4 not detected
Plumstead Northern System
2,605 people PFOA or PFOS above the 2029 federal MCL
Hastings Muni Auth
2,100 people PFAS-4 not detected
Newville Boro Water Auth
2,070 people PFAS-4 not detected
Centre Hall Boro Water Dept
1,900 people PFAS-4 not detected
E Armstrong Cnty Muni Auth
1,875 people PFAS-4 not detected
Waterford Municipal Authority
1,700 people PFAS-4 not detected
Aqua PA Lake Latonka WTP
1,600 people PFAS-4 not detected
Ellsworth Boro Water Dept
1,250 people PFAS-4 not detected
Rockwood Boro Muni Auth
1,250 people PFAS-4 not detected
Croyle TWP Water Auth
989 people PFAS-4 not detected
Millville Municipal Authority
969 people PFAS-4 not detected
Buck Hill Falls Water CO
876 people PFAS-4 not detected
Conneaut Lake Borough WTP
870 people PFAS-4 not detected
Fishertown Water Assn
801 people PFAS-4 not detected
Hickory Hills MHC
800 people PFAS-4 not detected
Washington TWP Water System
797 people PFAS-4 not detected
Penns Creek Municipal Auth
725 people PFAS-4 not detected
Eei Meadows Complex
628 people PFOA or PFOS above the 2029 federal MCL
Meshoppen Borough Water CO
563 people PFAS-4 not detected
Lutheran Home at Topton
410 people PFAS-4 not detected
Foxcroft Manor Mobile Home Pk
200 people PFAS-4 not detected
Skyview Gardens Heights Apts
186 people PFAS-4 not detected
Evitts Creek Water CO
100 people PFAS-4 not detected
Lakeview Mobilehome Park
44 people PFAS-4 not detected
Maple Manor MHP
37 people PFAS-4 not detected
Pennsylvania PFAS limits (state MCLs)
| Compound | State MCL | Federal MCL (from April 2029) | In force since |
|---|---|---|---|
| PFOA | 14 ng/L | 4.0 ng/L | January 14, 2023 |
| PFOS | 18 ng/L | 4.0 ng/L | January 14, 2023 |
Source: Pennsylvania Department of Environmental Protection (PA DEP), Bureau of Safe Drinking Water, 25 Pa. Code Chapter 109 (PFAS MCL Rule). https://www.pa.gov/agencies/dep/programs-and-services/water/bureau-of-safe-drinking-water/pfas
How to read these numbers
This page lists all 360 community water systems in Pennsylvania with UCMR 5 PFAS results, across 65 counties. We compare each one with our 0.5 ng/L PFAS-4 benchmark and with the 4.0 ng/L federal MCL for PFOA and PFOS, which applies from April 2029. UCMR 5 results do not indicate compliance or noncompliance with the PFAS drinking water standards. The samples come from entry points, with 3 to 4 ng/L reporting limits. Pennsylvania also enforces its own PFAS MCLs under 25 Pa. Code Chapter 109 (PFAS MCL Rule) (table above). State agency: Pennsylvania Department of Environmental Protection (PA DEP), Bureau of Safe Drinking Water. State monitoring: initial monitoring 2024, quarterly compliance monitoring since 2024; statewide results summary xlsx refreshed semi-annually. Regulation data retrieved September 19, 2026.
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.