Harris County, Texas — public water systems

1,235 active public water systems serve Harris County, reporting 6M people served.

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

Active systems

1,235

Population served

Community systems

685

Groundwater share

81%

Water systems in Harris County

Active public water systems in Harris County, Texas
#	Water system	County	Population served	Type	Source
1	City of Houston	Harris	2,970,543	Community	Surface water
2	City of Pasadena	Harris	152,000	Community	Purchased surface water
3	Clear Lake City Water Authority	Harris	89,702	Community	Purchased surface water
4	City of Baytown	Harris	86,004	Community	Purchased surface water
5	City of Houston Ud 5 - Kingwood	Harris	80,073	Community	Groundwater
6	Harris County MUD 165	Harris	40,503	Community	Purchased surface water
7	City of La Porte	Harris	36,569	Community	Purchased surface water
8	City of Deer Park	Harris	34,495	Community	Purchased surface water
9	City of Katy	Harris	25,253	Community	Groundwater
10	Bridgestone MUD	Harris	24,528	Community	Purchased surface water
11	Timber Lane Utility District	Harris	24,507	Community	Groundwater
12	Northwest Harris County MUD 5	Harris	23,766	Community	Purchased surface water
13	Harris County Fwsd 51	Harris	19,671	Community	Purchased surface water
14	Cimarron MUD	Harris	19,338	Community	Groundwater
15	City of West University Place	Harris	19,200	Community	Purchased surface water
16	Harris County MUD 82	Harris	18,990	Community	Groundwater
17	Northwest Park MUD	Harris	18,168	Community	Groundwater
18	Clear Brook City MUD	Harris	18,108	Community	Purchased surface water
19	City of Bellaire	Harris	18,090	Community	Purchased surface water
20	Harris Montgomery Counties MUD 386	Harris	18,018	Community	Purchased groundwater
21	Harris County MUD 53	Harris	17,856	Community	Purchased surface water
22	City of Tomball	Harris	17,532	Community	Groundwater
23	City of South Houston	Harris	17,397	Community	Purchased surface water
24	Harris County MUD 26	Harris	17,178	Community	Groundwater
25	Harris County MUD 71	Harris	17,079	Community	Groundwater
26	Harris County MUD 167	Harris	16,761	Community	Groundwater
27	Harris County MUD 55 Heritage Park	Harris	16,392	Community	Purchased surface water
28	City of Humble	Harris	15,616	Community	Purchased surface water
29	Harris County Fwsd 61	Harris	15,400	Community	Groundwater
30	Harris County MUD 105	Harris	14,925	Community	Purchased surface water
31	Harris County MUD 200 Cranbrook	Harris	14,868	Community	Purchased surface water
32	Harris County MUD 24	Harris	14,796	Community	Purchased surface water
33	Cnp Utility District	Harris	14,718	Community	Purchased surface water
34	Harris County MUD 285	Harris	14,268	Community	Purchased surface water
35	City of Houston Willow Chase	Harris	14,169	Community	Groundwater
36	Meadowhill Regional MUD	Harris	13,863	Community	Groundwater
37	Harris County Wcid 21	Harris	13,845	Community	Purchased surface water
38	Remington MUD 1	Harris	13,746	Community	Purchased surface water
39	City of Webster	Harris	13,710	Community	Purchased surface water
40	City of Seabrook	Harris	13,560	Community	Purchased surface water
41	Newport MUD	Harris	13,191	Community	Surface water
42	Harris County MUD 157	Harris	13,062	Community	Purchased surface water
43	Harris County MUD 168	Harris	13,029	Community	Groundwater
44	Tomball Isd Cypress Rosehill Plant	Harris	12,600	Non-transient non-community	Groundwater
45	Harris County MUD 1	Harris	12,342	Community	Groundwater
46	Northampton MUD	Harris	12,162	Community	Groundwater
47	Harris County MUD 368	Harris	11,835	Community	Purchased surface water
48	Harris County MUD 153	Harris	11,781	Community	Groundwater
49	Harris County MUD 81	Harris	11,514	Community	Groundwater
50	Memorial Villages Water Authority	Harris	11,382	Community	Purchased surface water