Community Water System · PWS TX0150018
San Antonio Water System
Operator location San Antonio, Texas - larger served population (> 3,309) at 2,113,151 people served; 38 SDWIS violations on record from surface water sources.
- 2,113,151
- People served (this PWS)
- 38
- EPA violations (this PWS)
- 4
- Health-based (this PWS)
- 3 PFAS
- UCMR5 (this PWS)
San Antonio Water System standing, mid SDWIS violation third
2,113,151 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 11% is middle-third health share (≤ 23%). UCMR5: middle-third PFAS panel (≤ 4 compounds). Population rank #7 of 29,740 among systems serving 500+.
The verdict
San Antonio Water System lands in the middle third by violation volume (38), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (2,113,151; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 11% (middle-third health share (≤ 23%)). UCMR5 detected 3 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #7 of 29,740
- Population · /systems
- #2 of 3,040
- Population · TX
- 38
- Total EPA violations on record
- 11%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
3 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 763,867
- County
- Bexar
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 25
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 4 | 2005 |
| E. COLI | MR | 4 | 2012 |
| Public Notice | Other | 4 | 2016 |
| Coliform (TCR) | MR | 4 | 2016 |
| Toxaphene | MR | 1 | 2008 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2008 |
| Simazine | MR | 1 | 2008 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2008 |
| Hexachlorocyclopentadiene | MR | 1 | 2008 |
| Atrazine | MR | 1 | 2008 |
| Pentachlorophenol | MR | 1 | 2008 |
| Nitrate | MR | 1 | 2010 |
| HEXACHLOROBENZENE | MR | 1 | 2008 |
| Methoxychlor | MR | 1 | 2008 |
| Heptachlor epoxide | MR | 1 | 2008 |
| BHC-GAMMA | MR | 1 | 2008 |
| LASSO | MR | 1 | 2008 |
| Heptachlor | MR | 1 | 2008 |
| Chlordane | MR | 1 | 2008 |
| Endrin | MR | 1 | 2008 |
| Benzo(a)pyrene | MR | 1 | 2008 |
Violation Count vs. the National Corpus
San Antonio Water System has 38 recorded EPA violations, 49% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 50% carry more. 11% of this system's own violations are health-based (4 of 38), and it ranks #7 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)
38 Lower than most fewer violations than 50% 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. 6 of 2378 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFNA | 8/14/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 8/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 8/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 8/14/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 8/14/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 8/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 8/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 8/14/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 8/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/14/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFBA | 8/14/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 8/14/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/14/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 8/14/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 8/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 8/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 8/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/14/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 8/14/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 8/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/14/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 8/14/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpA | 8/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 8/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 8/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 8/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 8/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 8/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 8/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 8/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/1/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 8/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| ADONA | 8/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 8/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 8/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 8/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 8/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NEtFOSAA | 8/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 8/1/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTA | 8/1/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 8/1/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFHpS | 8/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 8/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
Population served record for San Antonio Water System
EPA SDWIS lists 2,113,151 people served and 763,867 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
38 violations · 2,113,151 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 Antonio Water System
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.