Community Water System · PWS TX2450006
Sebastian MUD
Operator location Sebastian, Texas - upper-third violation load (> 74 violations) with 106 EPA violations; surface water source; 1,884 served (PWS-level, not municipal population).
- 1,884
- People served (this PWS)
- 106
- EPA violations (this PWS)
- 18
- Health-based (this PWS)
- 4 PFAS
- UCMR5 (this PWS)
Sebastian MUD standing, high SDWIS violation third
106 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 17% is middle-third health share (≤ 23%). UCMR5: middle-third PFAS panel (≤ 4 compounds). Population rank #14,097 of 29,740 among systems serving 500+.
The verdict
Sebastian MUD sits in the upper third of the sitemap cohort by violation count (106), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,884 (mid served population (≤ 3,309)). Health-based share is 17% (middle-third health share (≤ 23%)). UCMR5 detected 4 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #14,097 of 29,740
- Population · /systems
- #1,730 of 3,040
- Population · TX
- 106
- Total EPA violations on record
- 17%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 769
- County
- Willacy
- School/Daycare
- No
- MCL Violations
- 15
- Monitoring Violations
- 72
- Treatment Tech Violations
- 3
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | MR | 33 | 2019 |
| Interim Enhanced Surface Water Treatment Rule | MR | 16 | 2019 |
| TTHM | MCL | 10 | 2004 |
| Public Notice | Other | 9 | 2025 |
| Revised Total Coliform Rule | MON | 8 | 2020 |
| Total Haloacetic Acids (HAA5) | MCL | 5 | 2004 |
| E. COLI | MR | 4 | 2009 |
| CARBON, TOTAL | MR | 4 | 2024 |
| Lead and Copper Rule | MR | 4 | 2015 |
| LEAD AND COPPER RULE REVISIONS | TT | 3 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 3 | 2024 |
| Coliform (TCR) | MR | 3 | 2007 |
| Surface Water Treatment Rule | Other | 1 | 1993 |
Violation Count vs. the National Corpus
Sebastian MUD has 106 recorded EPA violations, 74% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 25% carry more. 17% of this system's own violations are health-based (18 of 106), and it ranks #14,097 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)
106 Around the middle fewer violations than 25% 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. 27 of 348 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| 9Cl-PF3ONS | 7/24/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| NFDHA | 7/24/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 7/24/2024 | 4.20 ppt | 3.00 ppt | Detected |
| PFMPA | 7/24/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 7/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 7/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeS | 7/24/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 7/24/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 4:2 FTS | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 7/24/2024 | 4.40 ppt | 3.00 ppt | Detected |
| PFBA | 7/24/2024 | 7.80 ppt | 5.00 ppt | Detected |
| HFPO-DA | 7/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 7/24/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 7/24/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 7/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 7/24/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFNA | 7/24/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFUnA | 7/24/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHpS | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 7/24/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 7/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 7/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 7/24/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 7/24/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 7/24/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 7/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 7/24/2024 | 7.80 ppt | 5.00 ppt | Detected |
| PFDA | 7/24/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 7/24/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTrDA | 7/24/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 7/24/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFUnA | 7/24/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 7/24/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
SDWIS compliance record for Sebastian MUD
106 violations on record for TX2450006; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch
Nationwide peers
106 violations · 1,884 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Sebastian MUD
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.