Montgomery County, Pennsylvania — public water systems

166 active public water systems serve Montgomery County, reporting 1.3M people served.

Dataset updated July 2026 . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

166

Population served

1.3M

Community systems

Groundwater share

84.3%

Water systems in Montgomery County

Active public water systems in Montgomery County, Pennsylvania
#	Water system	County	Population served	Type	Source
1	Aqua Pa Main System	Montgomery	822,600	Community	Surface water
2	North Penn Water Authority	Montgomery	91,941	Community	Purchased surface water
3	Pa American Norristown	Montgomery	88,885	Community	Surface water
4	North Wales Water Authority	Montgomery	72,496	Community	Surface water
5	Pottstown Borough Water Auth	Montgomery	36,000	Community	Surface water
6	Horsham Water&Sewer Authority	Montgomery	26,000	Community	Purchased surface water
7	Ambler Boro Water Dept	Montgomery	20,000	Community	Surface water
8	Aqua Pa Hatboro	Montgomery	12,901	Community	Purchased surface water
9	Aqua Pa Superior Main System	Montgomery	11,400	Community	Purchased surface water
10	Merck and Co Inc.	Montgomery	8,550	Non-transient non-community	Purchased surface water
11	Collegeville Trappe Joint PWD	Montgomery	8,470	Community	Groundwater
12	Pa American Audubon	Montgomery	8,200	Community	Purchased surface water
13	Telford Borough Authority	Montgomery	7,700	Community	Purchased surface water
14	Schwenksville Borough Auth	Montgomery	5,200	Community	Purchased surface water
15	Upper Hanover Water Authority	Montgomery	4,600	Community	Groundwater
16	Aqua Pa Perkiomen Township	Montgomery	3,600	Community	Groundwater
17	Radisson Valley Forge Hotel	Montgomery	3,500	Non-transient non-community	Groundwater
18	E Greenville Boro Water Dept	Montgomery	3,100	Community	Surface water
19	Red Hill Water Authority	Montgomery	2,500	Community	Groundwater
20	Valley Forge Natl Park	Montgomery	2,300	Transient non-community	Groundwater
21	Hatfield Quality Meats Inc.	Montgomery	1,850	Non-transient non-community	Groundwater
22	Constellation Nuclear Pwr Plnt	Montgomery	1,650	Non-transient non-community	Groundwater
23	Upper Dublin High School	Montgomery	1,473	Non-transient non-community	Purchased surface water
24	Pottstown Hosp Tower Health	Montgomery	1,425	Non-transient non-community	Purchased surface water
25	Village of Neshaminy Falls	Montgomery	1,300	Community	Purchased surface water
26	Parkhouse Nursing & Rehab Ctr	Montgomery	1,200	Community	Groundwater
27	Aqua Pa Perkiomen Woods	Montgomery	1,100	Community	Groundwater
28	Spring Mountain Adventures	Montgomery	1,000	Transient non-community	Groundwater
29	New Hanover Upper Fred E S	Montgomery	850	Non-transient non-community	Groundwater
30	Aqua Pa Upper Providence	Montgomery	810	Community	Purchased surface water
31	Gilbertsville Elementary	Montgomery	800	Non-transient non-community	Groundwater
32	Marlborough Elementary School	Montgomery	800	Non-transient non-community	Groundwater
33	Jefferson Hospital Lansdale	Montgomery	700	Non-transient non-community	Purchased surface water
34	Frederick Living	Montgomery	640	Community	Groundwater
35	Camp Hart Musser Reservation	Montgomery	600	Transient non-community	Groundwater
36	Fort Washington Elem School	Montgomery	532	Non-transient non-community	Purchased surface water
37	Perkiomen Crossing	Montgomery	508	Community	Groundwater
38	Salford Hills Elem School	Montgomery	500	Non-transient non-community	Groundwater
39	Aqua Pa Superior Center Point	Montgomery	500	Community	Groundwater
40	Hickory Valley G C Snack Bar	Montgomery	500	Transient non-community	Groundwater
41	Horsham Clinic	Montgomery	488	Non-transient non-community	Groundwater
42	Biddle Air National Guard Base	Montgomery	440	Non-transient non-community	Groundwater
43	Camp Hope for Kids	Montgomery	410	Transient non-community	Groundwater
44	Limerick Diner	Montgomery	400	Transient non-community	Groundwater
45	Indian Valley Country Club	Montgomery	400	Transient non-community	Groundwater
46	Camp Green Lane	Montgomery	350	Transient non-community	Groundwater
47	Flourtown Swim Club	Montgomery	350	Transient non-community	Groundwater
48	Lehigh Valley Dairies Ntnc	Montgomery	328	Non-transient non-community	Groundwater
49	Green Hill MHP	Montgomery	323	Community	Groundwater
50	Avante Apartments	Montgomery	315	Community	Groundwater