Maricopa County, Arizona — public water systems

217 active public water systems serve Maricopa County, reporting 4.4M people served.

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

Active systems

217

Population served

4.4M

Community systems

100

Groundwater share

88%

Water systems in Maricopa County

Active public water systems in Maricopa County, Arizona
#	Water system	County	Population served	Type	Source
1	Phoenix City of	Maricopa	1,695,000	Community	Surface water
2	Mesa City of	Maricopa	466,000	Community	Surface water
3	Gilbert, Town of	Maricopa	247,600	Community	Surface water
4	Chandler City of	Maricopa	247,328	Community	Surface water
5	Scottsdale City of	Maricopa	241,361	Community	Surface water
6	Glendale City of	Maricopa	234,766	Community	Surface water
7	Peoria City of	Maricopa	187,676	Community	Surface water
8	Tempe City of	Maricopa	165,000	Community	Surface water
9	Epcor - Agua Fria	Maricopa	127,718	Community	Surface water
10	Queen Creek Town of	Maricopa	95,502	Community	Groundwater
11	Avondale City of	Maricopa	83,001	Community	Purchased surface water
12	Liberty Water Lpsco	Maricopa	55,810	Community	Groundwater
13	Goodyear Water Department	Maricopa	50,001	Community	Surface water
14	Surprise City of - Mountain Vista	Maricopa	40,007	Community	Groundwater
15	El Mirage City of	Maricopa	39,884	Community	Groundwater
16	Epcor - Sun City	Maricopa	38,016	Community	Groundwater
17	City of Buckeye - Valencia Town Division	Maricopa	30,377	Community	Groundwater
18	Epcor - Chaparral City	Maricopa	26,026	Community	Surface water
19	Epcor - Sun City West	Maricopa	25,796	Community	Groundwater
20	Desert Oasis	Maricopa	23,963	Community	Groundwater
21	Epcor - Anthem	Maricopa	23,826	Community	Surface water
22	Pima Utilities	Maricopa	20,000	Community	Groundwater
23	Arizona Water Co - White Tanks	Maricopa	18,858	Community	Purchased surface water
24	City of Buckeye Sonora - Sundance	Maricopa	15,783	Community	Groundwater
25	Epcor - North East Agua Fria	Maricopa	14,723	Community	Groundwater
26	Epcor - Paradise Valley/Scottsdale	Maricopa	14,107	Community	Purchased surface water
27	Festival Ranch	Maricopa	10,313	Community	Groundwater
28	Beardsley Water Company 1	Maricopa	10,263	Community	Groundwater
29	City of Buckeye Tartesso Water System	Maricopa	10,123	Community	Groundwater
30	Tolleson City of	Maricopa	9,300	Community	Purchased surface water
31	Usaf Luke Air Force Base	Maricopa	8,440	Community	Purchased surface water
32	Buckeye City of	Maricopa	7,008	Community	Groundwater
33	Sunrise Water Company	Maricopa	6,490	Community	Groundwater
34	Wickenburg Town of	Maricopa	6,481	Community	Groundwater
35	Carl T Hayden Veterans Medical Center	Maricopa	6,293	Non-transient non-community	Purchased surface water
36	Rose Valley Water Company	Maricopa	6,202	Community	Groundwater
37	Valley Utilities Water Company Glendale	Maricopa	5,940	Community	Groundwater
38	Cave Creek Water	Maricopa	5,895	Community	Surface water
39	Epcor- Rio Verde	Maricopa	5,330	Community	Groundwater
40	Epcor - Tierra Del Rio	Maricopa	4,868	Community	Groundwater
41	Phoenix International Raceway	Maricopa	4,500	Non-transient non-community	Groundwater
42	Aspc Lewis Complex Water System	Maricopa	4,300	Community	Groundwater
43	Desert Hills Water	Maricopa	4,220	Community	Purchased surface water
44	Carefree Water Company	Maricopa	3,894	Community	Purchased surface water
45	Palo Verde Nuclear Generating Station	Maricopa	3,000	Non-transient non-community	Groundwater
46	Mcprd - Lake Pleasant	Maricopa	2,950	Transient non-community	Groundwater
47	Chandler Heights Citrus Irrigation Dist	Maricopa	2,620	Community	Groundwater
48	Clearwater Utility Company Inc.	Maricopa	2,175	Community	Groundwater
49	Gila Bend Town of	Maricopa	1,922	Community	Groundwater
50	Sheraton Phoenix Downtown	Maricopa	1,804	Non-transient non-community	Purchased surface water