How many public water systems are in Oklahoma?

Oklahoma has 1,254 active public water systems in EPA SDWIS records, including 864 community water systems. Together they report serving 3.6M people.

What is the largest water system in Oklahoma?

Oklahoma City is the largest active public water system in Oklahoma, serving a reported 644,000 people.

62.2% of Oklahoma's active public water systems draw primarily on groundwater and 37.8% on surface water (including purchased supplies).

1,254 active systems regulated under the Safe Drinking Water Act, serving a reported 3.6M people across 92 counties.

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

Active systems

1,254

Population served

3.6M

Community systems

864

Groundwater share

62.2%

864

Community water system

Non-transient non-community water system

306

Transient non-community water system

The largest active public water systems in Oklahoma by population served
#	Water system	County	Population served	Type	Source
1	Oklahoma City	Oklahoma	644,000	Community	Surface water
2	Tulsa	Tulsa	413,000	Community	Surface water
3	Broken Arrow Municipal Authority	Tulsa	116,330	Community	Surface water
4	Norman Utilities Authority	Cleveland	104,868	Community	Surface water
5	Lawton	Comanche	92,757	Community	Surface water
6	Edmond Pwa	Oklahoma	79,408	Community	Surface water
7	Midwest City	Oklahoma	55,935	Community	Surface water
8	Moore Public Works Authority	Cleveland	55,083	Community	Purchased surface water
9	Stillwater Utilities Authority	Payne	53,000	Community	Surface water
10	Enid	Garfield	49,347	Community	Surface water
11	Muskogee Municipal Authority	Muskogee	38,310	Community	Surface water
12	Bartlesville	Washington	34,748	Community	Surface water
13	Oklahoma University	Cleveland	34,000	Community	Purchased surface water
14	Shawnee Municipal Authority	Pottawatomie	29,990	Community	Surface water
15	Sand Springs	Tulsa	28,774	Community	Surface water
16	Ponca City Mun Water	Kay	27,155	Community	Surface water
17	Wagoner Co. Rwd #4	Wagoner	25,792	Community	Surface water
18	Washington Co Rwd #3 (New,#1)	Tulsa	25,375	Community	Surface water
19	Ardmore	Carter	24,893	Community	Surface water
20	Tinker Air Force Base	Oklahoma	24,645	Community	Groundwater
21	Fort Sill Hqusafacfs	Comanche	23,000	Community	Purchased surface water
22	Owasso	Tulsa	23,000	Community	Purchased surface water
23	Duncan Public Utilities Authority	Stephens	23,000	Community	Surface water
24	Ada	Pontotoc	22,600	Community	Groundwater
25	Yukon	Canadian	22,498	Community	Purchased surface water

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