Zapata County, Texas — public water systems
At a glance
4 active public water systems are filed under Zapata County, Texas in EPA's SDWIS records, together reporting 17,126 people served. The largest is Zapata County Waterworks Swtp, which reports serving 13,736 people. All 4 are community water systems serving people where they live.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
4
Population served
17.1K
Community systems
4
Groundwater share
0%
How does Zapata County compare with other Texas counties?
Zapata County has the 219th-most active public water systems among the 309 counties listed for active Texas systems in EPA records; among the 234 with 3 or more systems, the median has 12. Its systems report 17,126 people served in total, the 133rd-largest county figure in the state and less than 0.1% of the statewide total. The average system here reports serving 4,282 people, about 11% below the Texas average of 4,789. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.
Where does Zapata County's drinking water come from?
By primary water source, Zapata County's active systems draw on surface water (3, 75%) and purchased surface water (1, 25%). Overall, none rely mainly on groundwater (including purchased groundwater) and all on surface water, compared with 78% and 21% across Texas. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. The county's largest system, Zapata County Waterworks Swtp, draws primarily on surface water.
What kinds of water systems operate in Zapata County?
Zapata County's active systems break down as 4 community systems (100%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. EPA lists their owner types as local government (100%).
Water systems in Zapata County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Zapata County Waterworks Swtp | Zapata | 13,736 | Community | Surface water |
| 2 | Siesta Shores Wcid | Zapata | 1,893 | Community | Surface water |
| 3 | Zapata County San Ygnacio and Ramireno | Zapata | 1,254 | Community | Surface water |
| 4 | Zapata County Wcid Hwy 16 East | Zapata | 243 | Community | Purchased surface water |
Zapata County water systems: frequently asked questions
How many public water systems are in Zapata County, Texas?
EPA's SDWIS records file 4 active public water systems under Zapata County, Texas: 4 community systems (100%).
Who supplies drinking water in Zapata County, TX?
The largest community water systems filed under Zapata County are Zapata County Waterworks Swtp (13,736 people served), Siesta Shores Wcid (1,893 people served) and Zapata County San Ygnacio and Ramireno (1,254 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.
Does Zapata County's drinking water come from groundwater or surface water?
Of the 4 active public water systems in Zapata County, none draw mainly on groundwater and all on surface water, counting purchased supplies. The largest system, Zapata County Waterworks Swtp, uses surface water.
Where can I find a water quality report for Zapata County?
Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 4 community systems are filed under Zapata County, so the report to look for is the one from the system that supplies your address.
How can I check violations for a water system in Zapata County?
Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.
More Texas water systems
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Public water systems in Zapata County, Texas”, https://aquacensus.com/water-systems/texas/zapata (data as of October 1, 2026).