Collin County, Texas — public water systems

35 active public water systems serve Collin County, reporting 1.3M people served.

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

Active systems

Population served

1.3M

Community systems

Groundwater share

20%

Water systems in Collin County

Active public water systems in Collin County, Texas
#	Water system	County	Population served	Type	Source
1	City of Plano	Collin	292,059	Community	Purchased surface water
2	City of Frisco	Collin	231,910	Community	Purchased surface water
3	City of Mckinney	Collin	224,043	Community	Purchased surface water
4	City of Allen	Collin	104,870	Community	Purchased surface water
5	City of Celina	Collin	52,701	Community	Purchased surface water
6	City of Wylie	Collin	47,322	Community	Purchased surface water
7	Town of Prosper	Collin	42,598	Community	Purchased surface water
8	City of Princeton	Collin	37,019	Community	Purchased surface water
9	Culleoka WSC	Collin	24,615	Community	Purchased surface water
10	City of Anna	Collin	23,960	Community	Purchased surface water
11	City of Murphy	Collin	21,082	Community	Purchased surface water
12	City of Melissa	Collin	18,020	Community	Purchased surface water
13	East Fork Sud	Collin	17,589	Community	Purchased surface water
14	Bear Creek Sud	Collin	15,822	Community	Purchased surface water
15	Wylie Northeast Sud	Collin	11,430	Community	Purchased surface water
16	Town of Fairview	Collin	11,100	Community	Purchased surface water
17	North Collin Sud	Collin	10,674	Community	Purchased surface water
18	City of Josephine	Collin	9,800	Community	Purchased surface water
19	Copeville Sud	Collin	8,438	Community	Purchased surface water
20	City of Lucas	Collin	8,378	Community	Purchased surface water
21	City of Parker	Collin	6,486	Community	Purchased surface water
22	City of Farmersville	Collin	5,312	Community	Purchased surface water
23	Nevada Sud	Collin	4,218	Community	Purchased surface water
24	Verona Sud	Collin	3,672	Community	Groundwater
25	Milligan WSC	Collin	3,364	Community	Purchased surface water
26	North Custer Road Plant	Collin	2,754	Community	Groundwater
27	Frognot Sud	Collin	2,643	Community	Groundwater
28	Westminster Sud	Collin	2,424	Community	Groundwater
29	Desert WSC	Collin	2,091	Community	Groundwater
30	Seis Lagos Utility District	Collin	2,037	Community	Purchased surface water
31	City of Blue Ridge	Collin	1,189	Community	Groundwater
32	Weston WSC	Collin	912	Community	Groundwater
33	North Farmersville WSC	Collin	747	Community	Purchased surface water
34	Air Park Estates	Collin	96	Community	Purchased surface water
35	North Texas Mwd Wylie WTP	Collin	90	Community	Surface water