Community Water System · PWS TX0840063
San Leon MUD
Operator location San Leon, Texas - larger served population (> 3,309) at 11,622 people served; 63 SDWIS violations on record from surface water sources.
- 11,622
- People served (this PWS)
- 63
- EPA violations (this PWS)
- 4
- Health-based (this PWS)
- 4 PFAS
- UCMR5 (this PWS)
San Leon MUD standing, mid SDWIS violation third
11,622 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 6% is middle-third health share (≤ 23%). UCMR5: middle-third PFAS panel (≤ 4 compounds). Population rank #4,211 of 29,740 among systems serving 500+.
The verdict
San Leon MUD lands in the middle third by violation volume (63), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (11,622; 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 4 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #4,211 of 29,740
- Population · /systems
- #354 of 3,040
- Population · TX
- 63
- 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.
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 3,874
- County
- Galveston
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 44
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 18 | 2019 |
| Lead and Copper Rule | MR | 10 | 2024 |
| Public Notice | Other | 10 | 2021 |
| Coliform (TCR) | MR | 8 | 2013 |
| Revised Total Coliform Rule | MON | 8 | 2020 |
| Coliform (TCR) | MCL | 4 | 2005 |
| Consumer Confidence Rule | Other | 4 | 2019 |
Violation Count vs. the National Corpus
San Leon MUD has 63 recorded EPA violations, 63% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 37% carry more. 6% of this system's own violations are health-based (4 of 63), and it ranks #4,211 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)
63 Around the middle fewer violations than 37% 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. 14 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFBS | 7/26/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 7/26/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 7/26/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 7/26/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 7/26/2024 | 12.80 ppt | 3.00 ppt | Detected |
| NFDHA | 7/26/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 7/26/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 7/26/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 7/26/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 7/26/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 7/26/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFHpA | 7/26/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 7/26/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 7/26/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| HFPO-DA | 7/26/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDoA | 7/26/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 7/26/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 7/26/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/26/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/26/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 7/26/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/26/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 7/26/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 7/26/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 7/26/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 7/26/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 7/26/2024 | 6.90 ppt | 5.00 ppt | Detected |
| 6:2 FTS | 7/26/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 7/26/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/24/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFOA | 4/24/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDoA | 4/24/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 4/24/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 4/24/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFOS | 4/24/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 4/24/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 4/24/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 4/24/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 4/24/2025 | 3.40 ppt | 3.00 ppt | Detected |
| ADONA | 4/24/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 4/24/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 4/24/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 4/24/2025 | 13.20 ppt | 5.00 ppt | Detected |
| 6:2 FTS | 4/24/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 4/24/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 4/24/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 4/24/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 4/24/2025 | 69.00 ppt | 3.00 ppt | Detected |
| PFMBA | 4/24/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 4/24/2025 | 4.40 ppt | 3.00 ppt | Detected |
Population served record for San Leon MUD
EPA SDWIS lists 11,622 people served and 3,874 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch
Nationwide peers
63 violations · 11,622 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
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 San Leon 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.