- EPA's UCMR 5 testing looked for 30 contaminants here and found 2.
- Lithium: found in 4 of 4 samples, average 26.9 µg/L, highest 30.9 µg/L (EPA UCMR 5 testing, Aug 2025–May 2026)
Public EPA test results
What EPA records show for Zapata County Waterworks SWTP
EPA system ID TX2530002 · serves Zapata County, TX · about 13,736 people (EPA records)
Here's what EPA has on file for this water system: its testing for newer contaminants like PFAS (UCMR 5), lead testing and violations. It's not a test of your tap, and there's no Water Score here.
Public EPA test results
Zapata County Waterworks SWTP (EPA TX2530002)
What EPA records show for Zapata County Waterworks SWTP, as of October 14, 2026
Health-standard violation: Total Coliform Rules, Revised Total Coliform Rule, Jun 2023–Aug 2023 (EPA SDWIS).
Lead: 9 in 10 homes tested came in at or below 1.9 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2023–Dec 31, 2025). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 2.
PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Zapata County Waterworks SWTP use chloramine?
We didn't find chloramine in Zapata County Waterworks SWTP's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)