Washtenaw County, Michigan — public water systems

262 active public water systems serve Washtenaw County, reporting 300.4K people served.

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

Active systems

262

Population served

300.4K

Community systems

Groundwater share

96.9%

Water systems in Washtenaw County

Active public water systems in Washtenaw County, Michigan
#	Water system	County	Population served	Type	Source
1	Ann Arbor	Washtenaw	123,851	Community	Surface water
2	Ypsilanti Community Utility Authority	Washtenaw	53,988	Community	Purchased surface water
3	Pittsfield Township	Washtenaw	24,500	Community	Purchased surface water
4	Saline	Washtenaw	9,158	Community	Groundwater
5	Scio Township	Washtenaw	8,500	Community	Purchased surface water
6	Milan	Washtenaw	7,363	Community	Groundwater
7	Superior Township	Washtenaw	6,830	Community	Purchased surface water
8	Chelsea	Washtenaw	5,474	Community	Groundwater
9	Dexter	Washtenaw	4,500	Community	Groundwater
10	Augusta Township	Washtenaw	3,907	Community	Purchased surface water
11	Trinity Health Ann Arbor	Washtenaw	2,500	Non-transient non-community	Purchased surface water
12	Manchester	Washtenaw	2,150	Community	Groundwater
13	Mdot - Northfield Church, R814	Washtenaw	2,008	Transient non-community	Groundwater
14	Northville Crossing	Washtenaw	1,890	Community	Groundwater
15	Mdot - Chelsea Rest Area	Washtenaw	1,614	Transient non-community	Groundwater
16	Loch Alpine Sanitary Authority	Washtenaw	1,506	Community	Groundwater
17	Ann Arbor Township	Washtenaw	1,338	Community	Purchased surface water
18	Thornton Farms	Washtenaw	1,188	Community	Groundwater
19	Independence Lake County Park	Washtenaw	930	Transient non-community	Groundwater
20	Dnr-Pinckney Rec Area/Halfmoon Beach	Washtenaw	900	Transient non-community	Groundwater
21	Dnr-Pinckney Rec Area/Silver Lake	Washtenaw	900	Transient non-community	Groundwater
22	South Arbor Academy	Washtenaw	850	Non-transient non-community	Groundwater
23	Chestnut Hills	Washtenaw	813	Community	Groundwater
24	Fca Us LLC/Chelsea Prov Grnds	Washtenaw	800	Non-transient non-community	Groundwater
25	Andelina Farms	Washtenaw	750	Community	Groundwater
26	Orchard Grove	Washtenaw	725	Community	Groundwater
27	River Ridge - Saline	Washtenaw	720	Community	Groundwater
28	Dnr-Waterloo Rec Area-Sugarloaf Cg	Washtenaw	660	Transient non-community	Groundwater
29	Dnr-Pinckney Rec Area/Bruin Lk Cg-Main W	Washtenaw	660	Transient non-community	Groundwater
30	Whitmore Lake Elementary	Washtenaw	600	Non-transient non-community	Groundwater
31	Calvary Bible Church - Ypsilanti	Washtenaw	600	Transient non-community	Groundwater
32	Blue Heron Bay Spray Zone	Washtenaw	510	Transient non-community	Groundwater
33	St. Joseph Catholic - Dexter	Washtenaw	500	Transient non-community	Groundwater
34	Whitmore Lake Hs	Washtenaw	500	Non-transient non-community	Groundwater
35	Emerson School - Elementary	Washtenaw	450	Non-transient non-community	Groundwater
36	Emerson School - Middle	Washtenaw	450	Non-transient non-community	Groundwater
37	Barton Hills	Washtenaw	450	Community	Groundwater
38	Salem Elementary School	Washtenaw	430	Non-transient non-community	Groundwater
39	Christ Our King Lutheran Church - Church	Washtenaw	400	Transient non-community	Groundwater
40	Salem-South Lyon Dist Library	Washtenaw	400	Transient non-community	Groundwater
41	Christ Our King Lutheran Church-Addition	Washtenaw	400	Transient non-community	Groundwater
42	St. Nicholas Church	Washtenaw	400	Transient non-community	Groundwater
43	Knox Presbyterian Church	Washtenaw	400	Transient non-community	Groundwater
44	Saline Valley Farms	Washtenaw	375	Community	Groundwater
45	Huron Valley Tennis Club	Washtenaw	350	Transient non-community	Groundwater
46	Keystone Church	Washtenaw	334	Transient non-community	Groundwater
47	Westbrook Apartments	Washtenaw	330	Community	Groundwater
48	Dominos Pizza	Washtenaw	300	Transient non-community	Groundwater
49	First Unitarian Church	Washtenaw	300	Non-transient non-community	Groundwater
50	Cornman Farms, LLC.	Washtenaw	300	Transient non-community	Groundwater