Community Water System · PWS TX1050003
Texas State University - San Marcos
Operator location San Marcos, Texas - larger served population (> 3,309) at 43,552 people served; 52 SDWIS violations on record from groundwater sources.
- 43,552
- People served (this PWS)
- 52
- EPA violations (this PWS)
- 3
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Texas State University - San Marcos standing, mid SDWIS violation third
43,552 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: UCMR5 tested, none detected. Population rank #1,268 of 29,740 among systems serving 500+.
The verdict
Texas State University - San Marcos lands in the middle third by violation volume (52), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (43,552; 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 tested this system and reported no PFAS above the minimum reporting level.
- #1,268 of 29,740
- Population · /systems
- #101 of 3,040
- Population · TX
- 52
- 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.
System Details
- System Type
- Community
- Owner Type
- State
- Connections
- 2,502
- County
- Hays
- School/Daycare
- Yes
- MCL Violations
- 0
- Monitoring Violations
- 34
- Treatment Tech Violations
- 3
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 21 | 2016 |
| Public Notice | Other | 13 | 2015 |
| Revised Total Coliform Rule | MON | 8 | 2018 |
| E. COLI | MR | 5 | 2012 |
| Lead and Copper Rule | TT | 3 | 2015 |
Violation Count vs. the National Corpus
Texas State University - San Marcos has 52 recorded EPA violations, 57% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 42% carry more. 6% of this system's own violations are health-based (3 of 52), and it ranks #1,268 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)
52 Around the middle fewer violations than 42% 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. 0 of 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFNA | 4/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/9/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 4/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpA | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 4/9/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| ADONA | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 4/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDoA | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 4/9/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 4/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 4/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeS | 4/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 4/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 4/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 4/9/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 4/9/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 4/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 4/9/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| 6:2 FTS | 4/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 4/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 10/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 10/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 10/17/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 10/17/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 10/17/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 10/17/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOA | 10/17/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 10/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 10/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 10/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 10/17/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFUnA | 10/17/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFOS | 10/17/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 9Cl-PF3ONS | 10/17/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 10/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 10/17/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFEESA | 10/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 10/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 10/17/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpA | 10/17/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 10/17/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
Population served record for Texas State University - San Marcos
EPA SDWIS lists 43,552 people served and 2,502 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
52 violations · 43,552 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 Texas State University - San Marcos
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.