Pennsylvania Water Systems

Compiled by PlainEnviro Editorial, Environmental Data Editorial Team · July 13, 2026

1,787 community water systems in Pennsylvania, ranked by violation count. Data from EPA Safe Drinking Water Information System (SDWIS).

Water Systems

1,787

Total Violations

5,198

Health Violations

772 systems

Population Served

11,453,159

Pennsylvania operates 1,787 community water systems regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. Together these utilities serve an estimated 11,453,159 residents, each filing compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency.

Across the state, SDWIS records contain 5,198 total violations, of which 772 systems carry at least one active health-based violation, a Maximum Contaminant Level (MCL) exceedance or treatment-technique failure. That represents roughly 43% of Pennsylvania systems.

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? (213)

#	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 Mineral Point	Mineral Point	Surface Water	108	4,236	Yes
3	TRI CNTY JT MUNI AUTH Fredericktown	Fredericktown	Surface Water	88	10,100	Yes
4	BLAWNOX BORO WATER DEPT Pittsburgh	Pittsburgh	Surface Water	75	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	DOVER BORO WATER SYS Dover	Dover	Groundwater	23	1,900	Yes
12	LYKENS BORO AUTH Lykens	Lykens	Surface Water	22	3,220	Yes
13	MORRISVILLE MUNIC AUTHORITY Morrisville	Morrisville	Surface Water	21	13,342	Yes
14	TAMAQUA AREA WATER AUTHORITY Tamaqua	Tamaqua	Surface Water	21	8,000	Yes
15	NANTY GLO WATER AUTH Nanty Glo	Nanty Glo	Surface Water	21	3,152	Yes
16	BCWSA MAIN LOWER SOUTH Warrington	Warrington	Surface Water	20	52,621	Yes
17	BIRDSBORO MUNI WATER AUTH Birdsboro	Birdsboro	Surface Water	20	5,353	Yes
18	WESTERN CLINTON CO MUN AUTH Renovo	Renovo	Surface Water	20	2,610	Yes
19	REDBANK VALLEY MUN AUTH New Bethlehem	New Bethlehem	Surface Water	16	3,150	Yes
20	MEYERSDALE MUNI AUTH Meyersdale	Meyersdale	Surface Water	16	2,566	Yes
21	REYNOLDS WATER COMPANY Greenville	Greenville	Surface Water	16	2,370	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	HIGHRIDGE WATER AUTH Blairsville	Blairsville	Surface Water	13	16,000	Yes
25	DUQUESNE WATER DEPT Duquesne	Duquesne	Surface Water	13	5,565	Yes
26	FAWN FRAZER JT WATER AUTH Natrona Heights	Natrona Heights	Surface Water	13	4,650	Yes
27	AUTH OF BORO OF CHARLEROI Charleroi	Charleroi	Surface Water	12	27,000	Yes
28	E STROUDSBURG BORO WATER DEPT East Stroudsburg	East Stroudsburg	Surface Water	12	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	MERCERSBURG MUNI WATER AUTH Mercersburg	Mercersburg	Surface Water	9	2,350	Yes
36	READING AREA WATER AUTHORITY Reading	Reading	Surface Water	8	95,100	Yes
37	MUNI AUTH OF WASHINGTON TWP Belle Vernon	Belle Vernon	Surface Water	8	9,100	Yes
38	TOWANDA MUNICIPAL AUTHORITY Towanda	Towanda	Surface Water	8	5,000	Yes
39	NORTH EAST BOROUGH WATER DEPT North East	North East	Surface Water	8	4,601	Yes
40	PIKE TWP MUNICIPAL AUTHORITY Curwensville	Curwensville	Surface Water	8	4,500	Yes
41	MASONTOWN MUNI WATER WORKS Masontown	Masontown	Surface Water	8	3,841	Yes
42	WALNUTPORT AUTHORITY Walnutport	Walnutport	Surface Water	8	3,000	Yes
43	DUNCANNON MUNI WATER Duncannon	Duncannon	Groundwater	8	2,000	Yes
44	UPPER SOUTHAMPTON MUN AUTH Southampton	Southampton	Surface Water	7	16,000	Yes
45	DANVILLE MUNICIPAL WATER AUTH Danville	Danville	Surface Water	7	4,992	Yes
46	PENN ESTATES UTILITIES INCORP East Stroudsburg	East Stroudsburg	Groundwater	7	4,300	Yes
47	MONTGOMERY WATER AUTHORITY Montgomery	Montgomery	Groundwater	7	2,700	Yes
48	MAWC YOUGH PLANT Greensburg	Greensburg	Surface Water	6	133,000	Yes
49	MONROEVILLE MUNICIPAL AUTH Monroeville	Monroeville	Surface Water	6	48,500	Yes
50	POTTSTOWN BOROUGH WATER AUTH Pottstown	Pottstown	Surface Water	6	36,000	Yes
51	SUBURBAN LOCK HAVEN WATER AUTH Mill Hall	Mill Hall	Surface Water	6	9,700	Yes
52	MONACA BORO WATER DEPT Monaca	Monaca	Groundwater	6	6,500	Yes
53	KENNETT SQUARE MUN WATER WORKS Kennett Square	Kennett Square	Surface Water	6	6,328	Yes
54	MT UNION MUNICIPAL AUTH Mount Union	Mount Union	Surface Water	6	5,801	Yes
55	GLENDALE VALLEY MUNICIPAL AUTH Flinton	Flinton	Groundwater	6	3,200	Yes
56	ASPINWALL BORO WATER DEPT Pittsburgh	Pittsburgh	Surface Water	6	3,151	Yes
57	GALLITZIN BORO WATER AUTH Gallitzin	Gallitzin	Surface Water	6	3,130	Yes
58	MANSFIELD UNIVERSITY Mansfield	Mansfield	Surface Water	6	3,000	Yes
59	BRADFORD CITY WATER AUTHORITY Bradford	Bradford	Surface Water	5	18,500	Yes
60	SHIPPENSBURG BORO WATER AUTH Shippensburg	Shippensburg	Surface Water	5	17,800	Yes
61	PORTAGE BORO MUNI AUTH Portage	Portage	Surface Water	5	6,500	Yes
62	MANSFIELD BOROUGH MUN AUTH Mansfield	Mansfield	Surface Water	5	4,100	Yes
63	BLAIRSVILLE MUNI AUTH Blairsville	Blairsville	Surface Water	5	4,023	Yes
64	EMPORIUM WATER COMPANY Emporium	Emporium	Surface Water	5	3,300	Yes
65	BENTLEYVILLE MUNI AUTH Bentleyville	Bentleyville	Surface Water	5	2,600	Yes
66	PLUM CREEK MUNICIPAL AUTH Auburn	Auburn	Groundwater	5	2,500	Yes
67	WALLENPAUPACK LAKE ESTATES Lake Ariel	Lake Ariel	Groundwater	5	2,200	Yes
68	YORK WATER CO York	York	Surface Water	4	206,762	Yes
69	ALTOONA WATER AUTHORITY Altoona	Altoona	Surface Water	4	62,500	Yes
70	NORTHAMPTON BUCKS CO MUN AUTH Richboro	Richboro	Surface Water	4	36,750	Yes
71	LATROBE MUNI AUTH Latrobe	Latrobe	Surface Water	4	30,000	Yes
72	COLUMBIA WATER CO Columbia	Columbia	Surface Water	4	25,200	Yes
73	ELIZABETHTOWN AREA WATER Elizabethtown	Elizabethtown	Surface Water	4	19,000	Yes
74	CITY OF LOCK HAVEN WATER DEPT Lock Haven	Lock Haven	Surface Water	4	10,000	Yes
75	BELLEFONTE BOROUGH WATER AUTH Bellefonte	Bellefonte	Groundwater	4	9,500	Yes
76	LANSFORD COALDALE JT WATER AUT Lansford	Lansford	Groundwater	4	9,300	Yes
77	WARWICK TWP LITITZ SYS Lititz	Lititz	Surface Water	4	8,561	Yes
78	HOUTZDALE MUNICIPAL AUTHORITY Houtzdale	Houtzdale	Surface Water	4	8,410	Yes
79	UPPER LEACOCK TOWNSHIP Leola	Leola	Surface Water	4	7,734	Yes
80	JERSEY SHORE AREA JNT WAT AUTH Jersey Shore	Jersey Shore	Surface Water	4	6,600	Yes
81	ALBION BOROUGH Albion	Albion	Groundwater	4	5,842	Yes
82	SLATINGTON BOROUGH WATER SYS Slatington	Slatington	Surface Water	4	4,450	Yes
83	ROAMINGWOOD SEWER AND WATER Lake Ariel	Lake Ariel	Groundwater	4	3,775	Yes
84	MOUNTAINTOP REG WATER AUTH Snow Shoe	Snow Shoe	Groundwater	4	3,456	Yes
85	CONYNGHAM SUGARLOAF JOINT MA Conyngham	Conyngham	Groundwater	4	3,230	Yes
86	NORTH COVENTRY WATER SYSTEM Pottstown	Pottstown	Surface Water	4	2,907	Yes
87	ELKLAND BORO WATER AUTHORITY Elkland	Elkland	Groundwater	4	2,660	Yes
88	ONTELAUNEE TOWNSHIP Reading	Reading	Surface Water	4	2,598	Yes
89	IRVONA MUNICIPAL AUTHORITY Irvona	Irvona	Surface Water	4	1,980	Yes
90	CITY OF LANCASTER Lancaster	Lancaster	Surface Water	3	120,000	Yes
91	LCA WLSA CENTRAL DIVISION Allentown	Allentown	Surface Water	3	47,693	Yes
92	VEOLIA MECHANICSBURG Harrisburg	Harrisburg	Surface Water	3	45,013	Yes
93	SCHUYLKILL CO MUN AUTH Pottsville	Pottsville	Surface Water	3	31,850	Yes
94	NWWA WARRINGTON TOWNSHIP North Wales	North Wales	Surface Water	3	21,588	Yes
95	AMBRIDGE WATER AUTH Ambridge	Ambridge	Surface Water	3	19,500	Yes
96	CENTER TWP WATER AUTH Aliquippa	Aliquippa	Surface Water	3	19,000	Yes
97	EMMAUS BOROUGH PUBLIC WATER Emmaus	Emmaus	Groundwater	3	14,000	Yes
98	CLEARFIELD MUNICIPAL AUTH Clearfield	Clearfield	Surface Water	3	14,000	Yes
99	SUMMIT TOWNSHIP WATER AUTHORIT Erie	Erie	Surface Water	3	12,500	Yes
100	MUNICIPAL AUTHORITY SUNBURY Sunbury	Sunbury	Surface Water	3	11,043	Yes
101	GENERAL AUTHORITY OF FRANKLIN Franklin	Franklin	Groundwater	3	8,600	Yes
102	WELLSBORO MUNICIPAL AUTHORITY Wellsboro	Wellsboro	Surface Water	3	8,225	Yes
103	MILLERSVILLE UNIV Millersville	Millersville	Groundwater	3	7,950	Yes
104	EAST COCALICO TOWNSHIP Denver	Denver	Surface Water	3	6,735	Yes
105	MANHEIM AREA WATER & SEWER AUT Manheim	Manheim	Surface Water	3	6,701	Yes
106	AQUA PA FAWN LAKE FOREST Honesdale	Honesdale	Groundwater	3	6,533	Yes
107	AQUA PA CHALFONT Bryn Mawr	Bryn Mawr	Groundwater	3	5,900	Yes
108	MUN AUTH OF BORO OF BEDFORD Bedford	Bedford	Surface Water	3	5,127	Yes
109	WEST EARL WATER AUTHORITY Brownstown	Brownstown	Surface Water	3	4,327	Yes
110	WEST READING BORO WATER West Reading	West Reading	Surface Water	3	4,300	Yes
111	MOUNTAIN WATER ASSN Fairchance	Fairchance	Surface Water	3	3,856	Yes
112	WALKER TWP WATER ASSOC Mingoville	Mingoville	Groundwater	3	3,250	Yes
113	NEWPORT BORO WATER AUTH Newport	Newport	Surface Water	3	3,200	Yes
114	FORD CITY MUNI WATER WORKS Ford City	Ford City	Groundwater	3	2,991	Yes
115	MUNI AUTH OF BORO OF MATAMORAS Matamoras	Matamoras	Groundwater	3	2,900	Yes
116	MILESBURG BOROUGH WATER AUTH Milesburg	Milesburg	Groundwater	3	2,750	Yes
117	CENTRE HALL BORO WATER DEPT Centre Hall	Centre Hall	Groundwater	3	1,900	Yes
118	AQUA PA MAIN SYSTEM Bryn Mawr	Bryn Mawr	Surface Water	2	822,600	Yes
119	PITTSBURGH WATER & SEWER AUTH Pittsburgh	Pittsburgh	Surface Water	2	520,000	Yes
120	ERIE CITY WATER AUTHORITY Erie	Erie	Surface Water	2	220,001	Yes
121	WEST VIEW WATER AUTHORITY Pittsburgh	Pittsburgh	Surface Water	2	200,000	Yes
122	MAWC SWEENEY PLANT Greensburg	Greensburg	Surface Water	2	143,000	Yes
123	LEBANON WATER AUTH Lebanon	Lebanon	Surface Water	2	57,000	Yes
124	PA AMERICAN ROYERSFORD Spring City	Spring City	Surface Water	2	46,847	Yes
125	HANOVER MUNI WATER WORKS Hanover	Hanover	Surface Water	2	40,900	Yes
126	SOUTHWESTERN PA WATER AUTH Jefferson	Jefferson	Surface Water	2	40,000	Yes
127	MOON TWP MUNI AUTH Moon Township	Moon Township	Surface Water	2	38,000	Yes
128	GUILFORD WATER AUTH Chambersburg	Chambersburg	Groundwater	2	28,135	Yes
129	PLUM BORO MUNI AUTH Pittsburgh	Pittsburgh	Surface Water	2	27,500	Yes
130	HORSHAM WATER&SEWER AUTHORITY Horsham	Horsham	Surface Water	2	26,000	Yes
131	MUHLENBERG TWP MUNI AUTH Reading	Reading	Groundwater	2	21,000	Yes
132	WESTERN ALLEGHENY COUNTY MUN A Oakdale	Oakdale	Surface Water	2	19,031	Yes
133	PHOENIXVILLE WATER DEPT Phoenixville	Phoenixville	Surface Water	2	16,599	Yes
134	AQUA PA SUSQUEHANNA DIVISION Sayre	Sayre	Groundwater	2	15,569	Yes
135	SHILLINGTON MUNI AUTH Reading	Reading	Surface Water	2	13,300	Yes
136	SOUTH MIDDLETON TWP WATER AUTH Boiling Springs	Boiling Springs	Surface Water	2	11,695	Yes
137	COLLEGEVILLE TRAPPE JOINT PWD Trappe	Trappe	Groundwater	2	8,470	Yes
138	MUNICIPAL AUTHORITY OF CORRY Corry	Corry	Groundwater	2	7,800	Yes
139	EDGEWORTH BORO MUNI AUTH Leetsdale	Leetsdale	Surface Water	2	7,781	Yes
140	KLINE TOWNSHIP MUN AUTHORITY Mcadoo	Mcadoo	Groundwater	2	6,700	Yes
141	EAST PETERSBURG BOROUGH East Petersburg	East Petersburg	Surface Water	2	6,215	Yes
142	MONTOURSVILLE WATER COMPANY Montoursville	Montoursville	Groundwater	2	4,983	Yes
143	TARENTUM BORO WATER DEPT Tarentum	Tarentum	Surface Water	2	4,927	Yes
144	RIDGWAY BOROUGH WATER SYSTEM Ridgway	Ridgway	Surface Water	2	4,700	Yes
145	PA AMERICAN WATER KITTANNING New Castle	New Castle	Surface Water	2	4,617	Yes
146	NEW SEWICKLEY TWP MUNI AUTH Rochester	Rochester	Surface Water	2	4,276	Yes
147	WRIGHTSVILLE BORO MUNI AUTH Wrightsville	Wrightsville	Surface Water	2	4,076	Yes
148	DENVER BORO Denver	Denver	Surface Water	2	3,861	Yes
149	BRACKENRIDGE BORO WATER DEPT Brackenridge	Brackenridge	Surface Water	2	3,700	Yes
150	COOPER TWP MUNICIPAL AUTH Morrisdale	Morrisdale	Surface Water	2	3,700	Yes
151	FAIRVIEW TWP WATER AUTH DIST 3 Fairview	Fairview	Groundwater	2	3,320	Yes
152	MUNCY BOROUGH WATER COMPANY Muncy	Muncy	Groundwater	2	2,900	Yes
153	HONEY BROOK BORO WATER Honey Brook	Honey Brook	Groundwater	2	2,892	Yes
154	SUMMIT HILL WATER AUTHORITY Summit Hill	Summit Hill	Groundwater	2	2,890	Yes
155	WEST GROVE BOROUGH West Grove	West Grove	Groundwater	2	2,873	Yes
156	HUGHESVILLE BOROUGH WATER AUTH Hughesville	Hughesville	Groundwater	2	2,800	Yes
157	PINE GROVE BORO WATER SYSTEM Pine Grove	Pine Grove	Groundwater	2	2,711	Yes
158	JIM THORPE BOROUGH WATER WEST Jim Thorpe	Jim Thorpe	Surface Water	2	2,274	Yes
159	BCWSA SOLEBURY Warrington	Warrington	Groundwater	2	2,100	Yes
160	NEWVILLE BORO WATER AUTH Newville	Newville	Surface Water	2	2,070	Yes
161	EAST DEER TWP WATER DEPT Creighton	Creighton	Surface Water	2	2,000	Yes
162	ICMSA PINE TOWNSHIP Indiana	Indiana	Groundwater	2	1,932	Yes
163	PA AMER WATER CO-PITTSBURGH Mcmurray	Mcmurray	Surface Water	1	686,000	Yes
164	WILKINSBURG-PENN JT WATER AUTH Wilkinsburg	Wilkinsburg	Surface Water	1	125,000	Yes
165	PA AMER WATER CO NEW CASTLE New Castle	New Castle	Surface Water	1	43,279	Yes
166	PA AMERICAN COATESVILLE Coatesville	Coatesville	Surface Water	1	36,960	Yes
167	PA AMERICAN WATER CO YARDLEY Yardley	Yardley	Surface Water	1	33,171	Yes
168	CHAMBERSBURG BORO WATER SYS Chambersburg	Chambersburg	Surface Water	1	31,048	Yes
169	PAW GLEN ALSACE DIV Mechanicsburg	Mechanicsburg	Surface Water	1	24,951	Yes
170	FALLS TWP WATER & SEWER DEPT Fairless Hills	Fairless Hills	Surface Water	1	24,400	Yes
171	DOVER TWP WATER SYS Dover	Dover	Surface Water	1	21,097	Yes
172	EAST HEMPFIELD WATER AUTH Landisville	Landisville	Surface Water	1	20,988	Yes
173	ST MARYS AREA WATER AUTH Saint Marys	Saint Marys	Surface Water	1	19,588	Yes
174	MUN WATER AUTH OF ALIQUIPPA Aliquippa	Aliquippa	Groundwater	1	15,685	Yes
175	CRESWELL HEIGHTS JT AUTH South Heights	South Heights	Groundwater	1	15,000	Yes
176	PA AMERICAN WATER CO WARREN Warren	Warren	Groundwater	1	14,650	Yes
177	SWT MAIN SYSTEM Allentown	Allentown	Surface Water	1	14,500	Yes
178	BEAR VALLEY JOINT AUTH St Thomas	St Thomas	Surface Water	1	12,589	Yes
179	AQUA SHENANDOAH Shamokin	Shamokin	Surface Water	1	9,500	Yes
180	MUNICIPAL WATER AUTH ADAMS TWP Mars	Mars	Surface Water	1	8,700	Yes
181	GREENVILLE MUNI WATER AUTH Greenville	Greenville	Surface Water	1	8,600	Yes
182	DILLSBURG AREA AUTHORITY Dillsburg	Dillsburg	Groundwater	1	8,506	Yes
183	BOYERTOWN MUNI AUTH Boyertown	Boyertown	Surface Water	1	8,000	Yes
184	LITTLESTOWN BORO Littlestown	Littlestown	Groundwater	1	7,300	Yes
185	PALMERTON MUNICIPAL AUTHORITY Palmerton	Palmerton	Groundwater	1	7,000	Yes
186	SEWICKLEY BORO WATER AUTH Sewickley	Sewickley	Groundwater	1	6,800	Yes
187	BELLE VERNON BORO MUNI AUTH Belle Vernon	Belle Vernon	Surface Water	1	6,000	Yes
188	LOWER SAUCON AUTHORITY Bethlehem	Bethlehem	Surface Water	1	5,700	Yes
189	AQUA PA WATER CO HONESDALE White Haven	White Haven	Groundwater	1	5,500	Yes
190	SCHWENKSVILLE BOROUGH AUTH Schwenksville	Schwenksville	Surface Water	1	5,200	Yes
191	HAMBURG MUNI WATER&SEWER AUTH Hamburg	Hamburg	Surface Water	1	4,990	Yes
192	FREELAND BORO MUNI WATER AUTH Freeland	Freeland	Groundwater	1	4,610	Yes
193	FLEETWOOD BORO WATER SYSTEM Fleetwood	Fleetwood	Groundwater	1	4,218	Yes
194	AQUA PA INC TREASURE LAKE DIV Sharon	Sharon	Groundwater	1	4,155	Yes
195	ZELIENOPLE BORO Zelienople	Zelienople	Surface Water	1	4,123	Yes
196	NEW OXFORD MUNCI AUTH New Oxford	New Oxford	Surface Water	1	3,963	Yes
197	HEGINS HUBLEY AUTHORITY Valley View	Valley View	Groundwater	1	3,870	Yes
198	SOMERSET TWP MUNI AUTH OAKRIDG Somerset	Somerset	Surface Water	1	3,800	Yes
199	MT HOLLY SPRINGS BORO AUTH Mt Holly Springs	Mt Holly Springs	Groundwater	1	3,261	Yes
200	PAWC MANWALAMINK Bushkill	Bushkill	Groundwater	1	3,200	Yes
201	COUDERSPORT BORO AUTHORITY Coudersport	Coudersport	Groundwater	1	3,166	Yes
202	QUARRYVILLE BORO Quarryville	Quarryville	Surface Water	1	3,150	Yes
203	E GREENVILLE BORO WATER DEPT East Greenville	East Greenville	Surface Water	1	3,100	Yes
204	ORWIGSBURG MUNICIPAL WATER WKS Orwigsburg	Orwigsburg	Groundwater	1	3,000	Yes
205	UNION CITY MUNICIPAL AUTHORITY Union City	Union City	Surface Water	1	2,952	Yes
206	NESQUEHONING BORO WATER AUTH Nesquehoning	Nesquehoning	Groundwater	1	2,850	Yes
207	NATIONAL PIKE WATER AUTH Markleysburg	Markleysburg	Groundwater	1	2,800	Yes
208	WEATHERLY BORO MUN AUTH Weatherly	Weatherly	Groundwater	1	2,612	Yes
209	BLAIR TWP WATER & SEWER AUTH Duncansville	Duncansville	Surface Water	1	2,550	Yes
210	AQUA PA MONROE TWP Shamokin	Shamokin	Groundwater	1	2,400	Yes
211	BUHL COMMUNITY WATER COMPANY Mercer	Mercer	Groundwater	1	2,227	Yes
212	E ARMSTRONG CNTY MUNI AUTH Elderton	Elderton	Groundwater	1	1,875	Yes
213	TWP OF UPPER MAKEFIELD Newtown	Newtown	Groundwater	1	1,800	Yes

Systems with No Violations (287)

287 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 (134,570) 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) WARMINSTER MUNICIPAL AUTHORITY (40,000) NORTHAMPTON BORO MUNI AUTH (40,000) OAKMONT WATER AUTHORITY (39,901) NEWTOWN ARTESIAN WATER CO (38,500) PENN STATE UNIV (37,000) 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) VEOLIA WATER PA INC BLOOMSBURG (29,382) AQUA PA BRISTOL (28,727) PAW PENN DISTRICT (28,508) MIFFLIN CNTY MUNI AUTH (26,765) 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 (20,784) +237 more

All Water Systems in Pennsylvania (1,787)

Page 2 of 36, ordered by population served.

System	Population Served	Violations
WARMINSTER MUNICIPAL AUTHORITY	40,000	0
NORTHAMPTON BORO MUNI AUTH	40,000	0
SOUTHWESTERN PA WATER AUTH	40,000	2
OAKMONT WATER AUTHORITY	39,901	0
NEWTOWN ARTESIAN WATER CO	38,500	0
MOON TWP MUNI AUTH	38,000	2
PENN STATE UNIV	37,000	0
PA AMERICAN COATESVILLE	36,960	1
NORTHAMPTON BUCKS CO MUN AUTH	36,750	4
POTTSTOWN BOROUGH WATER AUTH	36,000	6
AQUA PA UWCHLAN	35,518	0
NORTH FAYETTE CNTY MUNI AUTH	35,409	0
PA AMERICAN WATER CO YARDLEY	33,171	1
WEST CNTY MUNI AUTH-MCKEESPORT	32,644	0
SCHUYLKILL CO MUN AUTH	31,850	3
CHAMBERSBURG BORO WATER SYS	31,048	1
PA AMERICAN WHITE DEER	30,209	0
BRODHEAD CREEK REG WATER AUTH	30,000	0
LATROBE MUNI AUTH	30,000	4
VEOLIA WATER PA INC BLOOMSBURG	29,382	0
AQUA PA BRISTOL	28,727	0
PAW PENN DISTRICT	28,508	0
GUILFORD WATER AUTH	28,135	2
PLUM BORO MUNI AUTH	27,500	2
AUTH OF BORO OF CHARLEROI	27,000	12
MIFFLIN CNTY MUNI AUTH	26,765	0
HORSHAM WATER&SEWER AUTHORITY	26,000	2
CARLISLE WATER TRMT PLT	26,000	0
COLUMBIA WATER CO	25,200	4
PAW GLEN ALSACE DIV	24,951	1
EPHRATA AREA JOINT AUTHORITY	24,500	0
FALLS TWP WATER & SEWER DEPT	24,400	1
PAW BLUE MOUNTAIN DIVISION	23,763	0
PA-AMERICAN WATER- UNIONTOWN	23,125	0
HIGHLAND S & W AUTH BEAVERDAM	22,617	10
PA AMERICAN WATER CO-INDIANA D	22,360	0
NWWA WARRINGTON TOWNSHIP	21,588	3
DOVER TWP WATER SYS	21,097	1
MUHLENBERG TWP MUNI AUTH	21,000	2
EAST HEMPFIELD WATER AUTH	20,988	1
PAW PHILIPSBURG	20,784	0
AMBLER BORO WATER DEPT	20,000	0
ST MARYS AREA WATER AUTH	19,588	1
AMBRIDGE WATER AUTH	19,500	3
WESTERN ALLEGHENY COUNTY MUN A	19,031	2
CENTER TWP WATER AUTH	19,000	3
ELIZABETHTOWN AREA WATER	19,000	4
FOX CHAPEL AUTH	18,500	0
BRADFORD CITY WATER AUTHORITY	18,500	5
PAWC POCONO DISTRICT	17,860	0

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Frequently Asked Questions

How many water systems are in Pennsylvania?

Pennsylvania has 1,787 community water systems tracked by the EPA, serving a combined population of 11,453,159 people.

How many water systems in Pennsylvania have health violations?

772 water systems in Pennsylvania have health-based violations, which include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. These represent 43% of all systems in the state.

What is the total number of water violations in Pennsylvania?

Pennsylvania water systems have accumulated 5,198 total violations across all 1,787 community water systems.

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

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

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