San Antonio Water System
EPA ID: TX0150018 · 2,113,151 people served · 108 ZIP codes
EPA records: San Antonio Water System, 2 past violations, all resolved, 2,113,151 served.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 33 (2021) to 12 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for San Antonio Water System Source: EPA SDWIS service area boundaries.
Service area boundary — Grade A
Service Area Demographics
The San Antonio Water System serves a community with a median household income of $71,263 and an estimated 2,241,984 residents across its service area. Approximately 43% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 45% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
🌊 Where Does Your Water Come From?
San Antonio Water System's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 1% of homes in Bexar County, Texas rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 65th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
Detected Contaminants
How San Antonio Water System compares to EPA limits
What This Means For You
Total Coliform at 1 presence exceeds the EPA maximum of presence.
Stage 1 DBP Rule at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 234 detections recorded. 5 exceed federal EPA limits (4 ppt for PFOA/PFOS).
Comparable Water Systems
Similar-sized systems in Texas
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
SAN ANTONIO WATER SYSTEM (EPA ID: TX0150018) is a community water system in Texas that serves approximately 2,113,151 people from surface water sources.
This system provides water to 108 ZIP codes across 22 communities.
Average Home Safety Score: A (91/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| February 23, 2024 | Total Coliform | Monitoring | Resolved |
| January 28, 2023 | Stage 1 DBP Rule | Health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Total Coliform | Microbiological | 1 | No |
| Stage 1 DBP Rule | Treatment Failure | 1 | Yes |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 78201 | 0.0016 mg/L | No | N/A |
| 78202 | 0.0016 mg/L | No | N/A |
| 78203 | 0.0016 mg/L | No | N/A |
| 78204 | 0.0016 mg/L | No | N/A |
| 78205 | 0.0016 mg/L | No | N/A |
| 78206 | 0.0016 mg/L | No | N/A |
| 78207 | 0.0016 mg/L | No | N/A |
| 78208 | 0.0016 mg/L | No | N/A |
| 78209 | 0.0016 mg/L | No | N/A |
| 78210 | 0.0016 mg/L | No | N/A |
| 78211 | 0.0016 mg/L | No | N/A |
| 78212 | 0.0016 mg/L | No | N/A |
| 78213 | 0.0016 mg/L | No | N/A |
| 78214 | 0.0016 mg/L | No | N/A |
| 78215 | 0.0016 mg/L | No | N/A |
| 78216 | 0.0016 mg/L | No | N/A |
| 78217 | 0.0016 mg/L | No | N/A |
| 78218 | 0.0016 mg/L | No | N/A |
| 78219 | 0.0016 mg/L | No | N/A |
| 78220 | 0.0016 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: 79 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 29 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
This system serves 108 ZIP codes:
78002 · 78006 · 78009 · 78015 · 78023 78039 · 78050 · 78052 · 78054 · 78064 78065 · 78066 · 78069 · 78073 · 78101 78108 · 78109 · 78112 · 78132 · 78152 78154 · 78201 · 78202 · 78203 · 78204 78205 · 78206 · 78207 · 78208 · 78209 78210 · 78211 · 78212 · 78213 · 78214 78215 · 78216 · 78217 · 78218 · 78219 78220 · 78221 · 78222 · 78223 · 78224 78225 · 78226 · 78227 · 78228 · 78229 78230 · 78231 · 78232 · 78233 · 78234 78235 · 78236 · 78237 · 78238 · 78239 78240 · 78241 · 78242 · 78243 · 78244 78245 · 78246 · 78247 · 78248 · 78249 78250 · 78251 · 78252 · 78253 · 78254 78255 · 78256 · 78257 · 78258 · 78259 78260 · 78261 · 78263 · 78264 · 78265 78266 · 78268 · 78269 · 78270 · 78278 78279 · 78280 · 78283 · 78284 · 78285 78286 · 78287 · 78288 · 78289 · 78291 78292 · 78293 · 78294 · 78295 · 78296 78297 · 78298 · 78299
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for San Antonio Water System (TX0150018) on EPA.gov.
Frequently Asked Questions
Is San Antonio Water System water safe to drink?
San Antonio Water System has recorded 1 health-based violation in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does San Antonio Water System serve?
San Antonio Water System serves approximately 2,113,151 people across 108 ZIP codes in Texas.
Where does San Antonio Water System get its water?
The primary water source is surface water.
Contact Your Water Utility
Public-record contact information for the water utility serving this system. Use these channels to request water quality reports, ask about service, or report issues directly.
Contact information from San Antonio Water System Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility, does not act as its agent, and does not provide customer support for it. Contact details shown are public-record information from CCR filings. For service issues, contact the utility directly using the information above.
Water Source & Treatment
Where this water originates and how it's treated before reaching your tap.
Source: San Antonio Water System Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
Treatment regime
How this utility classifies its treatment process and what each reported treatment chemical does.
Treatment chemicals and what each one does
Chemical names are reported verbatim by the utility. Purpose categories are ZipCheckup annotations based on standard drinking-water treatment practice.
Treatment classification and chemical list sourced from San Antonio Water System Consumer Confidence Report.
Treatment intensity is a ZipCheckup-derived classification based on the chemicals and processes the utility reports. Chemicals and contamination sources are taken verbatim from the utility's CCR filing. Routine federal monitoring and contaminant testing shown elsewhere on this page determine whether the water meets safety standards, not the treatment classification.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
PFAS Substances Detected in This System
This water system's Consumer Confidence Report disclosed the following PFAS compounds. Levels are from the utility's most recent reporting cycle.
In April 2024, EPA finalized the first National Primary Drinking Water Regulation for six PFAS. Public water systems have until 2029 to comply. EPA — PFAS regulation overview →
Source: Consumer Confidence Report disclosed by San Antonio Water System.
ZipCheckup is not affiliated with this water utility. PFAS detection data is sourced from public Consumer Confidence Reports filed by the utility itself.
SAWS is offering a free water service line inspection for all eligible customers through Project Lead. Eligibility is based on the year the customer’s house was built and if their current water service line status is “unknown.” Homes built prior to 1989 and have not completed any service line inspection will be eligible.
Lead Service Line Replacement Tracker
This water utility's lead service line (LSL) replacement program is tracked from public Consumer Confidence Report filings. Email signup notifies subscribers when the utility files an updated replacement plan or progress milestone.
San Antonio Water System
ZipCheckup is not affiliated with this water utility. LSL replacement-program data is sourced from public CCR filings published by the utility. Subscription notifications are based on automated parsing of subsequent CCR releases.
Learn more about Lead and Copper Rule replacement requirements →
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
San Antonio Water System (EPA ID: TX0150018) — request the latest Consumer Confidence Report or ask about specific contaminants.