Community Water System · PWS TX1080007
City of Mercedes
Operator location Mercedes, Texas - 29% of 112 violations are health-based (upper-third health share (> 23%)); surface water source; 16,258 served per SDWIS.
- 16,258
- People served (this PWS)
- 112
- EPA violations (this PWS)
- 33
- Health-based (this PWS)
- 1 PFAS
- UCMR5 (this PWS)
City of Mercedes standing, high SDWIS violation third
29% of 112 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 29% is upper-third health share (> 23%). UCMR5: lower-third PFAS panel (≤ 2 compounds). Population rank #3,222 of 29,740 among systems serving 500+.
The verdict
City of Mercedes sits in the upper third of the sitemap cohort by violation count (112), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (16,258; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 29% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 1 PFAS compound (lower-third PFAS panel (≤ 2 compounds)).
- #3,222 of 29,740
- Population · /systems
- #259 of 3,040
- Population · TX
- 112
- Total EPA violations on record
- 29%
- 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
- 6,061
- County
- Hidalgo
- School/Daycare
- No
- MCL Violations
- 30
- Monitoring Violations
- 49
- Treatment Tech Violations
- 3
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 21 | 2013 |
| Public Notice | Other | 14 | 2025 |
| Coliform (TCR) | MCL | 9 | 2012 |
| E. COLI | MR | 7 | 2020 |
| Coliform (TCR) | MR | 6 | 2011 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2012 |
| TTHM | MR | 4 | 2012 |
| Interim Enhanced Surface Water Treatment Rule | MR | 3 | 2008 |
| LEAD AND COPPER RULE REVISIONS | TT | 2 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 2 | 2024 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2009 |
| Xylenes, Total | MR | 1 | 2009 |
| o-Dichlorobenzene | MR | 1 | 2009 |
| 1,2-Dichloroethane | MR | 1 | 2009 |
| 1,1,1-Trichloroethane | MR | 1 | 2009 |
| Carbon tetrachloride | MR | 1 | 2009 |
| Trichloroethylene | MR | 1 | 2009 |
| Tetrachloroethylene | MR | 1 | 2009 |
| Ethylbenzene | MR | 1 | 2009 |
| Styrene | MR | 1 | 2009 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 2006 |
| Lead and Copper Rule | MR | 1 | 2013 |
| cis-1,2-Dichloroethylene | MR | 1 | 2009 |
| Combined Radium (-226 and -228) | MR | 1 | 2006 |
| 1,1,2-Trichloroethane | MR | 1 | 2009 |
| p-Dichlorobenzene | MR | 1 | 2009 |
| 1,2-Dichloropropane | MR | 1 | 2009 |
| Vinyl chloride | MR | 1 | 2009 |
| Interim Enhanced Surface Water Treatment Rule | TT | 1 | 2012 |
| 1,1-Dichloroethylene | MR | 1 | 2009 |
Violation Count vs. the National Corpus
City of Mercedes has 112 recorded EPA violations, 75% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 24% carry more. 29% of this system's own violations are health-based (33 of 112), and it ranks #3,222 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)
112 Higher than most more violations than 75% 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 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| 4:2 FTS | 7/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 7/24/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFDoA | 7/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 7/24/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFPeS | 7/24/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 7/24/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 7/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 7/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 7/24/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 7/24/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpS | 7/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 7/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/24/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFBS | 7/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 7/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 7/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 7/24/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 7/24/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFUnA | 7/24/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| NMeFOSAA | 7/24/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| 6:2 FTS | 7/24/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 7/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 7/24/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/24/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 7/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 7/24/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 7/24/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOA | 7/24/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 4/5/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 4/5/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 4/5/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 4/5/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 4/5/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 4/5/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 4/5/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 4/5/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 4/5/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 4/5/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NFDHA | 4/5/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| NEtFOSAA | 4/5/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 4/5/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 4/5/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 4/5/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFBS | 4/5/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 4/5/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 4/5/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFHxS | 4/5/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 4/5/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFUnA | 4/5/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
Health-based violations on City of Mercedes
33 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for TX1080007.
Sources: EPA SDWIS · Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch
Nationwide peers
112 violations · 16,258 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 City of Mercedes
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.