Community Water System · PWS TX2530002
Zapata County Waterworks Swtp
Operator location Zapata, Texas - 86% of 95 violations are health-based (upper-third health share (> 23%)); surface water source; 13,736 served per SDWIS.
- 13,736
- People served (this PWS)
- 95
- EPA violations (this PWS)
- 82
- Health-based (this PWS)
- 1 PFAS
- UCMR5 (this PWS)
Zapata County Waterworks Swtp standing, high SDWIS violation third
86% of 95 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 86% is upper-third health share (> 23%). UCMR5: lower-third PFAS panel (≤ 2 compounds). Population rank #3,719 of 29,740 among systems serving 500+.
The verdict
Zapata County Waterworks Swtp sits in the upper third of the sitemap cohort by violation count (95), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (13,736; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 86% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 1 PFAS compound (lower-third PFAS panel (≤ 2 compounds)).
- #3,719 of 29,740
- Population · /systems
- #313 of 3,040
- Population · TX
- 95
- Total EPA violations on record
- 86%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 4,292
- County
- Zapata
- School/Daycare
- No
- MCL Violations
- 74
- Monitoring Violations
- 2
- Treatment Tech Violations
- 8
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 39 | 2006 |
| Total Haloacetic Acids (HAA5) | MCL | 30 | 2005 |
| Interim Enhanced Surface Water Treatment Rule | TT | 8 | 2010 |
| Consumer Confidence Rule | Other | 5 | 2024 |
| Revised Total Coliform Rule | MCL | 5 | 2023 |
| Lead and Copper Rule | MR | 1 | 1992 |
| Surface Water Treatment Rule | MR | 1 | 2003 |
Violation Count vs. the National Corpus
Zapata County Waterworks Swtp has 95 recorded EPA violations, 72% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 28% carry more. 86% of this system's own violations are health-based (82 of 95), and it ranks #3,719 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
95 Around the middle fewer violations than 28% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 1 of 33 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFPeA | 8/28/2025 | 3.20 ppt | 3.00 ppt | Detected |
| 11Cl-PF3OUdS | 8/28/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 8/28/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 8/28/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 8/28/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/28/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/28/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 8/28/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/28/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFMBA | 8/28/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 8/28/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/28/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 8/28/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 8/28/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 8/28/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 8/28/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NMeFOSAA | 8/28/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 8/28/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 8/28/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 8/28/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/28/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 8/28/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 8/28/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 8/28/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 8/28/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 8/28/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/28/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/28/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 8/28/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 11/19/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 11/19/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NMeFOSAA | 11/19/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 11/19/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
Health-based violations on Zapata County Waterworks Swtp
82 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for TX2530002.
Sources: EPA SDWIS · Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch
Nationwide peers
95 violations · 13,736 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Zapata County Waterworks Swtp
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Texas compares on the same EPA violation measures. Texas systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.