Community Water System · PWS TX2140016
Rio WSC
Operator location Rio Grande City, Texas - UCMR5 detected 1 PFAS compound (lower-third PFAS panel (≤ 2 compounds)) on this PWS; SDWIS lists 168 violations and 6,639 people served.
- 6,639
- People served (this PWS)
- 168
- EPA violations (this PWS)
- 10
- Health-based (this PWS)
- 1 PFAS
- UCMR5 (this PWS)
Rio WSC standing, high SDWIS violation third
UCMR5 detected 1 PFAS compound - lower-third PFAS panel (≤ 2 compounds). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 6% is middle-third health share (≤ 23%). UCMR5: lower-third PFAS panel (≤ 2 compounds). Population rank #6,362 of 29,740 among systems serving 500+.
The verdict
Rio WSC sits in the upper third of the sitemap cohort by violation count (168), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (6,639; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 6% (middle-third health share (≤ 23%)). UCMR5 detected 1 PFAS compound (lower-third PFAS panel (≤ 2 compounds)).
- #6,362 of 29,740
- Population · /systems
- #635 of 3,040
- Population · TX
- 168
- Total EPA violations on record
- 6%
- 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
- 2,213
- County
- Starr
- School/Daycare
- No
- MCL Violations
- 6
- Monitoring Violations
- 113
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 41 | 2013 |
| Revised Total Coliform Rule | MON | 41 | 2020 |
| Consumer Confidence Rule | Other | 15 | 2023 |
| Public Notice | Other | 14 | 2021 |
| Lead and Copper Rule | MR | 9 | 2021 |
| Coliform (TCR) | MCL | 6 | 2013 |
| Total Haloacetic Acids (HAA5) | MR | 5 | 2021 |
| TTHM | MR | 5 | 2021 |
| Surface Water Treatment Rule | MR | 4 | 2019 |
| Interim Enhanced Surface Water Treatment Rule | MR | 4 | 2019 |
| Nitrate | MR | 4 | 2021 |
| LEAD AND COPPER RULE REVISIONS | RPT | 4 | 2024 |
| LEAD AND COPPER RULE REVISIONS | TT | 4 | 2024 |
Violation Count vs. the National Corpus
Rio WSC has 168 recorded EPA violations, 83% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 17% carry more. 6% of this system's own violations are health-based (10 of 168), and it ranks #6,362 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)
168 Higher than most more violations than 83% 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. 2 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NEtFOSAA | 7/25/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 7/25/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 7/25/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 7/25/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| NMeFOSAA | 7/25/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFOS | 7/25/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| HFPO-DA | 7/25/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 7/25/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/25/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFBA | 7/25/2023 | 5.20 ppt | 5.00 ppt | Detected |
| PFUnA | 7/25/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFDoA | 7/25/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 7/25/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 7/25/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 7/25/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 7/25/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/25/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 7/25/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 7/25/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| 6:2 FTS | 7/25/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 7/25/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 7/25/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 7/25/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/25/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 7/25/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 7/25/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 7/25/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 7/25/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 7/25/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/18/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFTrDA | 4/18/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 4/18/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFBS | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 4/18/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFUnA | 4/18/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| HFPO-DA | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
UCMR5 PFAS record for Rio WSC
Open EPA SDWIS federal reports for PWS TX2140016 to cross-check UCMR5 detections and violation codes; state primacy agencies enforce the Safe Drinking Water Act locally.
Sources: EPA SDWIS · Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch
Nationwide peers
168 violations · 6,639 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 Rio WSC
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.