Pennsylvania Water Systems

Compiled by PlainEnviro · August 25, 2026

1,783 community water systems in Pennsylvania, ranked by violation count. Data from EPA Safe Drinking Water Information System (SDWIS).

Water Systems

1,783

Health-Based Violation Records

5,292

Health Violations

790 systems

Population Served

11,450,803

Pennsylvania community water systems are regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act; each utility files compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency directly. PlainEnviro's health-based SDWIS extract above counts health-based exceedances only -- monitoring and reporting violations are not present in these figures.

Violation counts reflect both infrastructure realities and reporting diligence, a state with more small rural systems will accumulate more monitoring-type violations without necessarily delivering worse water. Health-based violations are the stronger safety signal. A past violation does not itself indicate current unsafe water; utilities must notify customers, remediate, and publish an annual Consumer Confidence Report. All numbers below draw directly from the federal SDWIS record.

Which water systems have violations? (217)

#	System Name	City	Source	Violations	Pop. Served	Health
1	EAST TAYLOR MUNI AUTH Johnstown	Johnstown	Surface Water	126	3,152	Yes
2	JACKSON TWP WATER AUTH Johnstown	Johnstown	Surface Water	108	4,236	Yes
3	TRI CNTY JT MUNI AUTH Fredericktown	Fredericktown	Surface Water	89	10,100	Yes
4	BLAWNOX BORO WATER DEPT Pittsburgh	Pittsburgh	Surface Water	68	2,200	Yes
5	EBENSBURG BORO MUNI AUTH Ebensburg	Ebensburg	Surface Water	62	8,500	Yes
6	MIDLAND BORO MUNI AUTH Midland	Midland	Surface Water	47	3,100	Yes
7	ALBERT GALLATIN MUNI AUTH Point Marion	Point Marion	Surface Water	37	2,695	Yes
8	JOHNSONBURG MUNICIPAL AUTH Johnsonburg	Johnsonburg	Surface Water	30	2,413	Yes
9	PA AMERICAN DILLINER SYSTEM Dilliner	Dilliner	Surface Water	24	4,200	Yes
10	PA AMERICAN WATER STEELTON Hummelstown	Hummelstown	Surface Water	23	6,428	Yes
11	LYKENS BORO AUTH Lykens	Lykens	Surface Water	23	3,220	Yes
12	DOVER BORO WATER SYS Dover	Dover	Groundwater	23	1,900	Yes
13	MORRISVILLE MUNIC AUTHORITY Morrisville	Morrisville	Surface Water	21	13,342	Yes
14	NANTY GLO WATER AUTH Nanty Glo	Nanty Glo	Surface Water	21	3,152	Yes
15	BCWSA MAIN LOWER SOUTH Warrington	Warrington	Surface Water	20	52,621	Yes
16	BIRDSBORO MUNI WATER AUTH Birdsboro	Birdsboro	Surface Water	20	5,353	Yes
17	WESTERN CLINTON CO MUN AUTH Renovo	Renovo	Surface Water	20	2,610	Yes
18	TAMAQUA AREA WATER AUTHORITY Tamaqua	Tamaqua	Surface Water	19	8,000	Yes
19	REYNOLDS WATER COMPANY Greenville	Greenville	Surface Water	17	2,370	Yes
20	REDBANK VALLEY MUN AUTH New Bethlehem	New Bethlehem	Surface Water	16	3,150	Yes
21	MEYERSDALE MUNI AUTH Meyersdale	Meyersdale	Surface Water	16	2,566	Yes
22	ICMSA CROOKED CREEK Indiana	Indiana	Surface Water	15	9,638	Yes
23	PLEASANT VALLEY WATER AUTH Connellsville	Connellsville	Surface Water	15	3,630	Yes
24	DUQUESNE WATER DEPT Duquesne	Duquesne	Surface Water	14	5,565	Yes
25	FAWN FRAZER JT WATER AUTH Natrona Heights	Natrona Heights	Surface Water	14	4,650	Yes
26	AUTH OF BORO OF CHARLEROI Charleroi	Charleroi	Surface Water	13	27,000	Yes
27	HIGHRIDGE WATER AUTH Blairsville	Blairsville	Surface Water	13	16,000	Yes
28	E STROUDSBURG BORO WATER DEPT East Stroudsburg	East Stroudsburg	Surface Water	13	13,000	Yes
29	HEMLOCK FARMS (MAIN) Lords Valley	Lords Valley	Groundwater	12	8,321	Yes
30	HARMONY BORO WATER AUTH Harmony	Harmony	Surface Water	12	6,669	Yes
31	BUFFALO TWP MUN AUTH FREEPORT Sarver	Sarver	Surface Water	12	5,849	Yes
32	HIGHLAND S & W AUTH BEAVERDAM Johnstown	Johnstown	Surface Water	10	22,617	Yes
33	N MIDDLETON WATER AUTH Carlisle	Carlisle	Surface Water	10	8,455	Yes
34	PATTON BORO WATER DEPT Patton	Patton	Groundwater	10	1,805	Yes
35	WALNUTPORT AUTHORITY Walnutport	Walnutport	Surface Water	9	3,000	Yes
36	MERCERSBURG MUNI WATER AUTH Mercersburg	Mercersburg	Surface Water	9	2,350	Yes
37	DUNCANNON MUNI WATER Duncannon	Duncannon	Groundwater	9	2,000	Yes
38	READING AREA WATER AUTHORITY Reading	Reading	Surface Water	8	95,100	Yes
39	UPPER SOUTHAMPTON MUN AUTH Southampton	Southampton	Surface Water	8	16,000	Yes
40	MUNI AUTH OF WASHINGTON TWP Belle Vernon	Belle Vernon	Surface Water	8	9,100	Yes
41	PORTAGE BORO MUNI AUTH Portage	Portage	Surface Water	8	6,500	Yes
42	TOWANDA MUNICIPAL AUTHORITY Towanda	Towanda	Surface Water	8	5,000	Yes
43	NORTH EAST BOROUGH WATER DEPT North East	North East	Surface Water	8	4,601	Yes
44	PIKE TWP MUNICIPAL AUTHORITY Curwensville	Curwensville	Surface Water	8	4,500	Yes
45	MASONTOWN MUNI WATER WORKS Masontown	Masontown	Surface Water	8	3,841	Yes
46	DANVILLE MUNICIPAL WATER AUTH Danville	Danville	Surface Water	7	4,992	Yes
47	PENN ESTATES UTILITIES INCORP Mechanicsburg	Mechanicsburg	Groundwater	7	4,300	Yes
48	GALLITZIN BORO WATER AUTH Gallitzin	Gallitzin	Surface Water	7	3,130	Yes
49	MONTGOMERY WATER AUTHORITY Montgomery	Montgomery	Groundwater	7	2,700	Yes
50	MAWC YOUGH PLANT Greensburg	Greensburg	Surface Water	6	133,000	Yes
51	MONROEVILLE MUNICIPAL AUTH Monroeville	Monroeville	Surface Water	6	48,500	Yes
52	POTTSTOWN BOROUGH WATER AUTH Pottstown	Pottstown	Surface Water	6	36,000	Yes
53	SUBURBAN LOCK HAVEN WATER AUTH Mill Hall	Mill Hall	Surface Water	6	9,700	Yes
54	MONACA BORO WATER DEPT Monaca	Monaca	Groundwater	6	6,500	Yes
55	KENNETT SQUARE MUN WATER WORKS Kennett Square	Kennett Square	Surface Water	6	6,328	Yes
56	MT UNION MUNICIPAL AUTH Mount Union	Mount Union	Surface Water	6	5,801	Yes
57	GLENDALE VALLEY MUNICIPAL AUTH Flinton	Flinton	Groundwater	6	3,200	Yes
58	ASPINWALL BORO WATER DEPT Pittsburgh	Pittsburgh	Surface Water	6	3,151	Yes
59	MANSFIELD UNIVERSITY Mansfield	Mansfield	Surface Water	6	3,000	Yes
60	BENTLEYVILLE MUNI AUTH Bentleyville	Bentleyville	Surface Water	6	2,600	Yes
61	BRADFORD CITY WATER AUTHORITY Bradford	Bradford	Surface Water	5	18,500	Yes
62	SHIPPENSBURG BORO WATER AUTH Shippensburg	Shippensburg	Surface Water	5	17,800	Yes
63	GENERAL AUTHORITY OF FRANKLIN Franklin	Franklin	Groundwater	5	9,096	Yes
64	MANSFIELD BOROUGH MUN AUTH Mansfield	Mansfield	Surface Water	5	4,100	Yes
65	BLAIRSVILLE MUNI AUTH Blairsville	Blairsville	Surface Water	5	4,023	Yes
66	MOUNTAINTOP REG WATER AUTH Snow Shoe	Snow Shoe	Groundwater	5	3,456	Yes
67	EMPORIUM WATER COMPANY Emporium	Emporium	Surface Water	5	3,300	Yes
68	ONTELAUNEE TOWNSHIP Reading	Reading	Surface Water	5	2,598	Yes
69	PLUM CREEK MUNICIPAL AUTH Auburn	Auburn	Groundwater	5	2,500	Yes
70	WALLENPAUPACK LAKE ESTATES Lake Ariel	Lake Ariel	Groundwater	5	2,200	Yes
71	YORK WATER CO York	York	Surface Water	4	206,762	Yes
72	ALTOONA WATER AUTHORITY Altoona	Altoona	Surface Water	4	62,500	Yes
73	SOUTHWESTERN PA WATER AUTH Jefferson	Jefferson	Surface Water	4	40,200	Yes
74	NORTHAMPTON BUCKS CO MUN AUTH Richboro	Richboro	Surface Water	4	36,750	Yes
75	LATROBE MUNI AUTH Latrobe	Latrobe	Surface Water	4	30,000	Yes
76	COLUMBIA WATER CO Columbia	Columbia	Surface Water	4	25,200	Yes
77	ELIZABETHTOWN AREA WATER Elizabethtown	Elizabethtown	Surface Water	4	19,000	Yes
78	CITY OF LOCK HAVEN WATER DEPT Lock Haven	Lock Haven	Surface Water	4	10,000	Yes
79	BELLEFONTE BOROUGH WATER AUTH Bellefonte	Bellefonte	Groundwater	4	9,500	Yes
80	LANSFORD COALDALE JT WATER AUT Lansford	Lansford	Groundwater	4	9,300	Yes
81	WARWICK TWP LITITZ SYS Lititz	Lititz	Surface Water	4	8,561	Yes
82	HOUTZDALE MUNICIPAL AUTHORITY Houtzdale	Houtzdale	Surface Water	4	8,410	Yes
83	UPPER LEACOCK TOWNSHIP Leola	Leola	Surface Water	4	7,734	Yes
84	JERSEY SHORE AREA JNT WAT AUTH Jersey Shore	Jersey Shore	Surface Water	4	6,600	Yes
85	ALBION BOROUGH Albion	Albion	Groundwater	4	5,842	Yes
86	SLATINGTON BOROUGH WATER SYS Slatington	Slatington	Surface Water	4	4,450	Yes
87	WEST EARL WATER AUTHORITY Brownstown	Brownstown	Surface Water	4	4,327	Yes
88	ROAMINGWOOD SEWER AND WATER Lake Ariel	Lake Ariel	Groundwater	4	3,775	Yes
89	CONYNGHAM SUGARLOAF JOINT MA Conyngham	Conyngham	Groundwater	4	3,230	Yes
90	NORTH COVENTRY WATER SYSTEM Pottstown	Pottstown	Surface Water	4	2,907	Yes
91	ELKLAND BORO WATER AUTHORITY Elkland	Elkland	Groundwater	4	2,660	Yes
92	IRVONA MUNICIPAL AUTHORITY Irvona	Irvona	Surface Water	4	1,980	Yes
93	AQUA PA MAIN SYSTEM Bryn Mawr	Bryn Mawr	Surface Water	3	822,600	Yes
94	CITY OF LANCASTER Lancaster	Lancaster	Surface Water	3	120,000	Yes
95	PA AMERICAN ROYERSFORD Spring City	Spring City	Surface Water	3	49,508	Yes
96	LCA WLSA CENTRAL DIVISION Allentown	Allentown	Surface Water	3	47,693	Yes
97	VEOLIA MECHANICSBURG Harrisburg	Harrisburg	Surface Water	3	45,013	Yes
98	SCHUYLKILL CO MUN AUTH Pottsville	Pottsville	Surface Water	3	31,850	Yes
99	NWWA WARRINGTON TOWNSHIP North Wales	North Wales	Surface Water	3	21,588	Yes
100	AMBRIDGE WATER AUTH Ambridge	Ambridge	Surface Water	3	19,500	Yes
101	WESTERN ALLEGHENY COUNTY MUN A Oakdale	Oakdale	Surface Water	3	19,031	Yes
102	CENTER TWP WATER AUTH Aliquippa	Aliquippa	Surface Water	3	19,000	Yes
103	PHOENIXVILLE WATER DEPT Phoenixville	Phoenixville	Surface Water	3	16,599	Yes
104	MUN WATER AUTH OF ALIQUIPPA Aliquippa	Aliquippa	Groundwater	3	15,685	Yes
105	EMMAUS BOROUGH PUBLIC WATER Emmaus	Emmaus	Groundwater	3	14,000	Yes
106	CLEARFIELD MUNICIPAL AUTH Clearfield	Clearfield	Surface Water	3	14,000	Yes
107	SHILLINGTON MUNI AUTH Reading	Reading	Surface Water	3	13,300	Yes
108	SUMMIT TOWNSHIP WATER AUTHORIT Erie	Erie	Surface Water	3	12,500	Yes
109	MUNICIPAL AUTHORITY SUNBURY Sunbury	Sunbury	Surface Water	3	11,043	Yes
110	WELLSBORO MUNICIPAL AUTHORITY Wellsboro	Wellsboro	Surface Water	3	8,225	Yes
111	MILLERSVILLE UNIV Millersville	Millersville	Groundwater	3	7,950	Yes
112	EAST COCALICO TOWNSHIP AUTH Denver	Denver	Surface Water	3	6,735	Yes
113	MANHEIM AREA WATER & SEWER AUT Manheim	Manheim	Surface Water	3	6,701	Yes
114	AQUA PA FAWN LAKE FOREST Honesdale	Honesdale	Groundwater	3	6,533	Yes
115	AQUA PA CHALFONT Bryn Mawr	Bryn Mawr	Groundwater	3	5,900	Yes
116	MUN AUTH OF BORO OF BEDFORD Bedford	Bedford	Surface Water	3	5,127	Yes
117	TARENTUM BORO WATER DEPT Tarentum	Tarentum	Surface Water	3	4,927	Yes
118	WEST READING BORO WATER West Reading	West Reading	Surface Water	3	4,300	Yes
119	UNION CITY MUNICIPAL AUTHORITY Union City	Union City	Surface Water	3	4,295	Yes
120	MOUNTAIN WATER ASSN Fairchance	Fairchance	Surface Water	3	3,856	Yes
121	WALKER TWP WATER ASSOC Mingoville	Mingoville	Groundwater	3	3,250	Yes
122	NEWPORT BORO WATER AUTH Newport	Newport	Surface Water	3	3,200	Yes
123	FORD CITY MUNI WATER WORKS Ford City	Ford City	Groundwater	3	2,991	Yes
124	MUNI AUTH OF BORO OF MATAMORAS Matamoras	Matamoras	Groundwater	3	2,900	Yes
125	MILESBURG BOROUGH WATER AUTH Milesburg	Milesburg	Groundwater	3	2,750	Yes
126	EAST DEER TWP WATER DEPT Creighton	Creighton	Surface Water	3	2,000	Yes
127	CENTRE HALL BORO WATER DEPT Centre Hall	Centre Hall	Groundwater	3	1,900	Yes
128	PITTSBURGH WATER & SEWER AUTH Pittsburgh	Pittsburgh	Surface Water	2	520,000	Yes
129	ERIE CITY WATER AUTHORITY Erie	Erie	Surface Water	2	220,001	Yes
130	WEST VIEW WATER AUTHORITY Pittsburgh	Pittsburgh	Surface Water	2	200,000	Yes
131	MAWC SWEENEY PLANT Greensburg	Greensburg	Surface Water	2	143,000	Yes
132	WILKINSBURG-PENN JT WATER AUTH Wilkinsburg	Wilkinsburg	Surface Water	2	125,000	Yes
133	LEBANON WATER AUTH Lebanon	Lebanon	Surface Water	2	57,000	Yes
134	HANOVER MUNI WATER WORKS Hanover	Hanover	Surface Water	2	40,900	Yes
135	MOON TWP MUNI AUTH Moon Township	Moon Township	Surface Water	2	38,000	Yes
136	GUILFORD WATER AUTH Chambersburg	Chambersburg	Groundwater	2	28,135	Yes
137	PLUM BORO MUNI AUTH Pittsburgh	Pittsburgh	Surface Water	2	27,500	Yes
138	HORSHAM WATER&SEWER AUTHORITY Horsham	Horsham	Surface Water	2	26,000	Yes
139	AQUA PA SUSQUEHANNA DIVISION Sayre	Sayre	Groundwater	2	15,569	Yes
140	SOUTH MIDDLETON TWP WATER AUTH Boiling Springs	Boiling Springs	Surface Water	2	11,695	Yes
141	DILLSBURG AREA AUTHORITY Dillsburg	Dillsburg	Groundwater	2	8,962	Yes
142	COLLEGEVILLE TRAPPE JOINT PWD Trappe	Trappe	Groundwater	2	8,470	Yes
143	BOYERTOWN MUNI AUTH Boyertown	Boyertown	Surface Water	2	8,000	Yes
144	MUNICIPAL AUTHORITY OF CORRY Corry	Corry	Groundwater	2	7,800	Yes
145	EDGEWORTH BORO MUNI AUTH Leetsdale	Leetsdale	Surface Water	2	7,781	Yes
146	KLINE TOWNSHIP MUN AUTHORITY Mcadoo	Mcadoo	Groundwater	2	6,700	Yes
147	EAST PETERSBURG BOROUGH East Petersburg	East Petersburg	Surface Water	2	6,215	Yes
148	BELLE VERNON BORO MUNI AUTH Belle Vernon	Belle Vernon	Surface Water	2	6,000	Yes
149	MONTOURSVILLE WATER COMPANY Montoursville	Montoursville	Groundwater	2	4,983	Yes
150	RIDGWAY BOROUGH WATER SYSTEM Ridgway	Ridgway	Surface Water	2	4,700	Yes
151	PA AMERICAN WATER KITTANNING New Castle	New Castle	Surface Water	2	4,499	Yes
152	NEW SEWICKLEY TWP MUNI AUTH Rochester	Rochester	Surface Water	2	4,276	Yes
153	WRIGHTSVILLE BORO MUNI AUTH Wrightsville	Wrightsville	Surface Water	2	4,076	Yes
154	DENVER BORO Denver	Denver	Surface Water	2	3,861	Yes
155	BRACKENRIDGE BORO WATER DEPT Brackenridge	Brackenridge	Surface Water	2	3,700	Yes
156	COOPER TWP MUNICIPAL AUTH Morrisdale	Morrisdale	Surface Water	2	3,700	Yes
157	FAIRVIEW TWP WATER AUTH DIST 3 Fairview	Fairview	Groundwater	2	3,320	Yes
158	MUNCY BOROUGH WATER COMPANY Muncy	Muncy	Groundwater	2	2,900	Yes
159	HONEY BROOK BORO WATER Honey Brook	Honey Brook	Groundwater	2	2,892	Yes
160	SUMMIT HILL WATER AUTHORITY Summit Hill	Summit Hill	Groundwater	2	2,890	Yes
161	WEST GROVE BOROUGH West Grove	West Grove	Groundwater	2	2,873	Yes
162	HUGHESVILLE BOROUGH WATER AUTH Hughesville	Hughesville	Groundwater	2	2,800	Yes
163	PINE GROVE BORO WATER SYSTEM Pine Grove	Pine Grove	Groundwater	2	2,711	Yes
164	WEATHERLY BORO MUN AUTH Weatherly	Weatherly	Groundwater	2	2,612	Yes
165	JIM THORPE BOROUGH WATER WEST Jim Thorpe	Jim Thorpe	Surface Water	2	2,274	Yes
166	BCWSA SOLEBURY Warrington	Warrington	Groundwater	2	2,100	Yes
167	NEWVILLE BORO WATER AUTH Newville	Newville	Surface Water	2	2,070	Yes
168	ICMSA PINE TOWNSHIP Indiana	Indiana	Groundwater	2	1,932	Yes
169	PA AMER WATER CO-PITTSBURGH Elrama	Elrama	Surface Water	1	686,000	Yes
170	PA AMER WATER CO NEW CASTLE New Castle	New Castle	Surface Water	1	43,279	Yes
171	PA AMERICAN COATESVILLE Coatesville	Coatesville	Surface Water	1	36,960	Yes
172	PA AMERICAN WATER CO YARDLEY Yardley	Yardley	Surface Water	1	33,171	Yes
173	CHAMBERSBURG BORO WATER SYS Chambersburg	Chambersburg	Surface Water	1	31,048	Yes
174	PAW GLEN ALSACE DIV Mechanicsburg	Mechanicsburg	Surface Water	1	24,951	Yes
175	FALLS TWP WATER & SEWER DEPT Fairless Hills	Fairless Hills	Surface Water	1	24,400	Yes
176	MUHLENBERG TWP MUNI AUTH Reading	Reading	Groundwater	1	22,400	Yes
177	DOVER TWP WATER SYS Dover	Dover	Surface Water	1	21,097	Yes
178	EAST HEMPFIELD WATER AUTH Landisville	Landisville	Surface Water	1	20,988	Yes
179	ST MARYS AREA WATER AUTH Saint Marys	Saint Marys	Surface Water	1	19,588	Yes
180	CRESWELL HEIGHTS JT AUTH South Heights	South Heights	Groundwater	1	15,000	Yes
181	PA AMERICAN WATER CO WARREN Warren	Warren	Groundwater	1	14,650	Yes
182	SWT MAIN SYSTEM Allentown	Allentown	Surface Water	1	14,500	Yes
183	BEAR VALLEY JOINT AUTH St Thomas	St Thomas	Surface Water	1	12,589	Yes
184	FINDLAY TWP MUNICIPAL AUTH Clinton	Clinton	Surface Water	1	11,460	Yes
185	AQUA SHENANDOAH Shamokin	Shamokin	Surface Water	1	9,500	Yes
186	MUNICIPAL WATER AUTH ADAMS TWP Mars	Mars	Surface Water	1	8,700	Yes
187	AQUA PA GREENVILLE Sharon	Sharon	Surface Water	1	8,600	Yes
188	VEOLIA WATER PA DALLAS Harrisburg	Harrisburg	Groundwater	1	7,563	Yes
189	LITTLESTOWN BORO Littlestown	Littlestown	Groundwater	1	7,300	Yes
190	PALMERTON MUNICIPAL AUTHORITY Palmerton	Palmerton	Groundwater	1	7,000	Yes
191	SEWICKLEY BORO WATER AUTH Sewickley	Sewickley	Groundwater	1	6,800	Yes
192	LOWER SAUCON AUTHORITY Bethlehem	Bethlehem	Surface Water	1	5,700	Yes
193	AQUA PA WATER CO HONESDALE White Haven	White Haven	Groundwater	1	5,500	Yes
194	SCHWENKSVILLE BOROUGH AUTH Schwenksville	Schwenksville	Surface Water	1	5,200	Yes
195	HAMBURG MUNI WATER&SEWER AUTH Hamburg	Hamburg	Surface Water	1	4,990	Yes
196	FREELAND BORO MUNI WATER AUTH Freeland	Freeland	Groundwater	1	4,610	Yes
197	NORTH SEWICKLEY MUN WATER AUTH Beaver Falls	Beaver Falls	Surface Water	1	4,578	Yes
198	FLEETWOOD BORO WATER SYSTEM Fleetwood	Fleetwood	Groundwater	1	4,218	Yes
199	AQUA PA INC TREASURE LAKE DIV Sharon	Sharon	Groundwater	1	4,155	Yes
200	ZELIENOPLE BORO Zelienople	Zelienople	Surface Water	1	4,123	Yes
201	NEW OXFORD MUNCI AUTH New Oxford	New Oxford	Surface Water	1	3,963	Yes
202	HEGINS HUBLEY AUTHORITY Valley View	Valley View	Groundwater	1	3,870	Yes
203	SOMERSET TWP MUNI AUTH OAKRIDG Somerset	Somerset	Surface Water	1	3,800	Yes
204	MT HOLLY SPRINGS BORO AUTH Mt Holly Springs	Mt Holly Springs	Groundwater	1	3,261	Yes
205	PAWC MANWALAMINK Bushkill	Bushkill	Groundwater	1	3,200	Yes
206	COUDERSPORT BORO AUTHORITY Coudersport	Coudersport	Groundwater	1	3,166	Yes
207	QUARRYVILLE BORO Quarryville	Quarryville	Surface Water	1	3,150	Yes
208	E GREENVILLE BORO WATER DEPT East Greenville	East Greenville	Surface Water	1	3,100	Yes
209	BEDMINSTER MUN AUTH Perkasie	Perkasie	Groundwater	1	3,042	Yes
210	ORWIGSBURG MUNICIPAL WATER WKS Orwigsburg	Orwigsburg	Groundwater	1	3,000	Yes
211	NESQUEHONING BORO WATER AUTH Nesquehoning	Nesquehoning	Groundwater	1	2,850	Yes
212	NATIONAL PIKE WATER AUTH Markleysburg	Markleysburg	Groundwater	1	2,800	Yes
213	BLAIR TWP WATER & SEWER AUTH Duncansville	Duncansville	Surface Water	1	2,550	Yes
214	AQUA PA MONROE TWP Shamokin	Shamokin	Groundwater	1	2,400	Yes
215	BUHL COMMUNITY WATER COMPANY Mercer	Mercer	Groundwater	1	2,227	Yes
216	E ARMSTRONG CNTY MUNI AUTH Elderton	Elderton	Groundwater	1	1,875	Yes
217	TWP OF UPPER MAKEFIELD Newtown	Newtown	Groundwater	1	1,800	Yes

Systems with No Violations (283)

283 water systems in Pennsylvania have zero recorded violations. Showing the 50 largest by population served.

PHILADELPHIA WATER DEPARTMENT (1,600,000) CHESTER WATER AUTHORITY (140,437) PA AMER WATER CO LAKE SCRANTON (137,142) LCA ALLENTOWN DIVISION (118,000) CITY OF BETHLEHEM (117,259) VEOLIA WATER (110,000) PA AMERICAN WATER CO WEST (105,127) EASTON AREA WATER SYSTEM (96,867) NORTH PENN WATER AUTHORITY (91,941) PA AMERICAN NORRISTOWN (88,885) NORTH WALES WATER AUTHORITY (72,496) STATE COLLEGE BORO WATER AUTH (72,000) CAPITAL REGION WATER (66,540) LOWER BUCKS CO JOINT MUN AUTH (63,007) HAMPTON SHALER WATER AUTHORITY (61,949) AQUA PA BENSALEM (59,001) PAW CEASETOWN (58,467) PAW NESBITT (52,640) PAW WATRES (52,002) WILLIAMSPORT MUN WATER AUTH (51,000) PA AMER WATER CO (50,200) GREATER JOHNSTOWN WA RIVERSIDE (49,500) BEAVER FALLS MUNI AUTH (49,500) AQUA PA WEST CHESTER (48,600) AQUA PA SHENANGO VALLEY WTP (48,000) NEW KENSINGTON MUNI AUTH (47,800) HCA HAZLETON DIVISION (45,000) PA AMERICAN WATER CO BUTLER (43,286) AQUA PA ROARING CREEK DIVISION (43,000) CRANBERRY TWP WTP (42,000) NORTHAMPTON BORO MUNI AUTH (40,000) OAKMONT WATER AUTHORITY (39,901) NEWTOWN ARTESIAN WATER CO (38,500) PENN STATE UNIV (37,000) WARMINSTER MUNICIPAL AUTHORITY (36,000) AQUA PA UWCHLAN (35,518) NORTH FAYETTE CNTY MUNI AUTH (35,409) WEST CNTY MUNI AUTH-MCKEESPORT (32,644) PA AMERICAN WHITE DEER (30,209) BRODHEAD CREEK REG WATER AUTH (30,000) MIFFLIN CNTY MUNI AUTH (29,432) VEOLIA WATER PA INC BLOOMSBURG (29,382) AQUA PA BRISTOL (28,727) PAW PENN DISTRICT (28,508) CARLISLE WATER TRMT PLT (26,000) EPHRATA AREA JOINT AUTHORITY (24,500) PAW BLUE MOUNTAIN DIVISION (23,763) PA-AMERICAN WATER- UNIONTOWN (23,125) PA AMERICAN WATER CO-INDIANA D (22,360) PAW PHILIPSBURG (20,865) +233 more

All Water Systems in Pennsylvania (1,783)

Page 1 of 36, ordered by population served.

System	Population Served	Violations
PHILADELPHIA WATER DEPARTMENT	1,600,000	0
AQUA PA MAIN SYSTEM	822,600	3
PA AMER WATER CO-PITTSBURGH	686,000	1
PITTSBURGH WATER & SEWER AUTH	520,000	2
ERIE CITY WATER AUTHORITY	220,001	2
YORK WATER CO	206,762	4
WEST VIEW WATER AUTHORITY	200,000	2
MAWC SWEENEY PLANT	143,000	2
CHESTER WATER AUTHORITY	140,437	0
PA AMER WATER CO LAKE SCRANTON	137,142	0
MAWC YOUGH PLANT	133,000	6
WILKINSBURG-PENN JT WATER AUTH	125,000	2
CITY OF LANCASTER	120,000	3
LCA ALLENTOWN DIVISION	118,000	0
CITY OF BETHLEHEM	117,259	0
VEOLIA WATER	110,000	0
PA AMERICAN WATER CO WEST	105,127	0
EASTON AREA WATER SYSTEM	96,867	0
READING AREA WATER AUTHORITY	95,100	8
NORTH PENN WATER AUTHORITY	91,941	0
PA AMERICAN NORRISTOWN	88,885	0
NORTH WALES WATER AUTHORITY	72,496	0
STATE COLLEGE BORO WATER AUTH	72,000	0
CAPITAL REGION WATER	66,540	0
LOWER BUCKS CO JOINT MUN AUTH	63,007	0
ALTOONA WATER AUTHORITY	62,500	4
HAMPTON SHALER WATER AUTHORITY	61,949	0
AQUA PA BENSALEM	59,001	0
PAW CEASETOWN	58,467	0
LEBANON WATER AUTH	57,000	2
PAW NESBITT	52,640	0
BCWSA MAIN LOWER SOUTH	52,621	20
PAW WATRES	52,002	0
WILLIAMSPORT MUN WATER AUTH	51,000	0
PA AMER WATER CO	50,200	0
PA AMERICAN ROYERSFORD	49,508	3
GREATER JOHNSTOWN WA RIVERSIDE	49,500	0
BEAVER FALLS MUNI AUTH	49,500	0
AQUA PA WEST CHESTER	48,600	0
MONROEVILLE MUNICIPAL AUTH	48,500	6
AQUA PA SHENANGO VALLEY WTP	48,000	0
NEW KENSINGTON MUNI AUTH	47,800	0
LCA WLSA CENTRAL DIVISION	47,693	3
VEOLIA MECHANICSBURG	45,013	3
HCA HAZLETON DIVISION	45,000	0
PA AMERICAN WATER CO BUTLER	43,286	0
PA AMER WATER CO NEW CASTLE	43,279	1
AQUA PA ROARING CREEK DIVISION	43,000	0
CRANBERRY TWP WTP	42,000	0
HANOVER MUNI WATER WORKS	40,900	2

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Frequently Asked Questions

How many water systems are in Pennsylvania?

Pennsylvania has 1,783 community water systems tracked by the EPA, serving a combined population of 11,450,803 people.

How many water systems in Pennsylvania have health violations?

790 water systems in Pennsylvania have health-based violations, which include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. These represent 44% of all systems in the state.

How many health-based violation records are in this extract for Pennsylvania?

PlainEnviro's health-based EPA SDWIS extract contains 5,292 records joined to 1,783 active community water systems in Pennsylvania. Monitoring and reporting records are not included.

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About This Data

Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Only community water systems (CWS) are included.

Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services

Read our methodology - how this data is sourced, computed, and verified.

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