Water Quality: San Antonio, TX
18 water systems • 2,172,460 people served
Multiple Health ViolationsWater Quality Summary
San Antonio is served by 18 public water systems with a combined service population of 2,172,460 people, and has 422 EPA Safe Drinking Water Act violations on record. Critically, 14 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. San Antonio's violation count is 99% above the national average for Texas. Contaminants associated with violations include Disinfection Byproducts, Lead, Stage 2 DBP.
Contaminants Found
Broad category of chemicals formed during disinfection, associated with increased cancer risk and adverse reproductive effects.
Common source: Reaction of disinfectants (chlorine, ozone, chloramines) with organic matter
Causes neurological damage, developmental delays in children, and kidney damage in adults even at low exposure levels.
Common source: Old plumbing pipes, lead solder, brass fixtures
EPA limit: Action Level: 0.015 mg/L (15 ppb)
Trihalomethanes and haloacetic acids that increase cancer risk and may cause adverse reproductive outcomes.
Common source: Chlorine disinfection reacting with natural organic matter in source water
EPA limit: TTHM: 0.080 mg/L; HAA5: 0.060 mg/L
Water Systems Serving San Antonio
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| SAN ANTONIO WATER SYSTEM | TX0150018 | Surface Water | 2,113,151 | 6 |
| JBSA - SAM HOUSTON | TX0150116 | Groundwater | 37,563 | 34 |
| JBSA - RANDOLPH | TX0150115 | Groundwater | 10,949 | 4 |
| CITY OF ALAMO HEIGHTS | TX0150039 | Groundwater | 7,357 | 36 |
| THE OAKS WSC | TX0150399 | Surface Water | 1,191 | 0 |
| BLUE SKIES OF TEXAS WEST | TX0150463 | Groundwater | 796 | 36 |
| PIONEER ESTATES | TX0150420 | Groundwater | 375 | 5 |
| CADILLAC WATER | TX0150247 | Groundwater | 252 | 8 |
| RIO MEDINA ESTATES | TX1630022 | Groundwater | 201 | 7 |
| SRALLA MOBILE HOME PARK | TX1011925 | Groundwater | 165 | 61 |
| MARTINEZ RANCH SUBDIVISION | TX2320061 | Groundwater | 150 | 24 |
| LITTLE JOES ICE HOUSE & TRAILER PARK | TX0150256 | Groundwater | 106 | 3 |
| RANCHERO ESTATES | TX1330150 | Groundwater | 105 | 41 |
| EVETTS APARTMENTS | TX0150238 | Groundwater | 51 | 98 |
| CORDI MARIAN VILLA | TX0150414 | Groundwater | 48 | 43 |
| CENTRAL TEXAS REGIONAL WSC | TX0260051 | Groundwater | 0 | 0 |
| SEGURO WATER | TX2330051 | Groundwater | 0 | 12 |
| SAN PEDRO WATER RESOURCES | TX2330064 | Groundwater | 0 | 4 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in Texas
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.