San Antonio, TX (78266): PFAS Detected in Mapped Water Systems
EPA data combined for 8 water systems mapped to this ZIP (largest mapped system: San Antonio Water System)
Health-based violation records by water system:
EPA records for the water systems mapped to 78266 in San Antonio, TX contain 169 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 58 are marked health-based.
Data source: U.S. Environmental Protection Agency (EPA) SDWIS
At a Glance
- Water EPA records for water systems mapped to this ZIP show 58 health-based violations and 111 non-health-based (since 2021).
- Lead The reported 90th-percentile lead result of 0.0016 mg/L is below the EPA action level for water systems; EPA's health goal for lead is zero.
- PFAS PFAS detected in UCMR5 sampling; see the PFAS section for each compound, compared with the federal PFAS MCL where one exists.
- Radon EPA Zone 3 - county-level radon potential, not evidence of a low home result.
- Flood 22 cumulative NFIP claim records. Check the current FEMA map for a specific address.
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For San Antonio (78266), a single critical-level condition heads the record, followed by 1 separate high-priority finding.
Score Breakdown
Overall Home Safety Score: Score unavailable
Required evidence is missing. Missing values remain unknown and are not imputed or renormalized.
Canonical components
Required domains
Coverage: 3 of 4 components and 2 of 3 domains observed.
Model 4.0.0; series home-safety-v4-cross-vertical.
Safety & Health (8) CRITICAL
Your Water System
ZIP code 78266 in San Antonio, Texas is mapped to the water system San Antonio Water System (EPA ID: TX0150018). This system provides water to approximately 2,643,729 people from surface water sources.
There are 8 community water systems serving this area.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| San Antonio Water System | TX0150018 | 2,643,729 | Surface water |
| City of Selma | TX0150492 | 11,418 | Groundwater |
| City of Garden Ridge | TX0460027 | 5,100 | Groundwater |
| Rockwall Ranch Subdivision | TX0460250 | 1,773 | Groundwater |
| Ramble Ridge Subdivision | TX0460243 | 411 | Surface water |
Other Water Quality Reports in Texas
- 73301 (Austin)
- 73344 (Austin)
- 73960 (Texhoma)
- 75001 (Addison) - 2 violations recorded for mapped water systems
- 75002 (Allen) - 14 violations recorded for mapped water systems
- 75006 (Carrollton) - 2 violations recorded for mapped water systems
- 75007 (Carrollton) - 1 violation recorded for mapped water systems
- 75009 (Celina) - 18 violations recorded for mapped water systems
- 75010 (Carrollton) - 1 violation recorded for mapped water systems
- 75011 (Carrollton)
- 75013 (Allen)
- 75014 (Irving)
- 75015 (Irving)
- 75016 (Irving)
- 75017 (Irving)
- 75019 (Coppell) - 5 violations recorded for mapped water systems
- 75020 (Denison) - 38 violations recorded for mapped water systems
- 75021 (Denison) - 30 violations recorded for mapped water systems
- 75022 (Flower Mound) - 18 violations recorded for mapped water systems
- 75023 (Plano)
Nearby Water Quality Reports
- 78154 (Schertz) - 6 mi - 17 violations recorded for mapped water systems
- 78261 (San Antonio) - 7 mi
- 78247 (San Antonio) - 8 mi
- 78108 (Cibolo) - 8 mi - 84 violations recorded for mapped water systems
- 78233 (San Antonio) - 8 mi - 5 violations recorded for mapped water systems
- 78148 (Universal City) - 8 mi - 5 violations recorded for mapped water systems
- 78259 (San Antonio) - 8 mi
- 78132 (New Braunfels) - 9 mi - 191 violations recorded for mapped water systems
- 78109 (Converse) - 10 mi - 19 violations recorded for mapped water systems
- 78260 (San Antonio) - 10 mi
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for San Antonio Water System (TX0150018) on EPA.gov.
4 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.
Compliance History
PFAS Contamination Detected
PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 78266.
Detected compounds: PFBA, PFPeA, PFBS, PFHxS, PFHxA.
Highest measured level: 0.0102 µg/L
Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.
Environmental Hazards (11) MODERATE
Home & Infrastructure (7) MODERATE
Area data suggest possible HVAC concerns - talk to a local expert.
Call (844) 439-2761Paid Partner This is a free service. You will be connected with an independent service provider. We may receive compensation.
Cost & Community (9) HIGH
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Protect Your Home in San Antonio
Based on local data for ZIP 78266, these services may benefit homeowners in your area.
Based on local data for your area. Use the tools below to explore your options.
Home & Flood Insurance
The ZIP code for this report in San Antonio has 22 FEMA flood claims on record. Standard homeowner policies don't cover flood damage - make sure you're protected.
Typical cost: Flood insurance: premiums vary by property and flood zone; request a quote
Check Your Flood Zone (Free)FEMA flood map lookup - see if your property is in a flood zone
Free tip: Check your FEMA flood zone at msc.fema.gov (free lookup)
Roofing Inspection & Repair
Active weather alerts in Texas increase the risk of roof damage from hail and high winds. A professional inspection can identify vulnerabilities.
Typical cost: Roof inspection: typically $75–$300; repairs $300–$1,500
Estimate Your Home Insurance NeedsService recommendations are based on public data for this ZIP code (FEMA, Census ACS, NWS). Actual needs vary by property. By calling, your information will be shared with an independent service provider. ZipCheckup may receive compensation. Cost estimates are approximate and vary by property, condition, and contractor.
Frequently Asked Questions
Is the tap water in 78266 safe to drink?
EPA SDWIS records 169 violations since 2021 across the water systems mapped to ZIP 78266 (primary system: San Antonio Water System), including 58 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.
Where does 78266's water come from?
The recorded water source for San Antonio Water System, a system mapped to ZIP code 78266, is Surface water. This system serves approximately 2,643,729 people.
How can I get my water tested in San Antonio?
If San Antonio Water System supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.
Is lead a concern in 78266 tap water?
The Lead and Copper Rule record selected for 78266 reports a 90th-percentile lead result of 0.0016 mg/L for a water system mapped to this ZIP (record date 2024-12-31). The EPA action level is 0.015 mg/L. This result is below the EPA action level; it does not show the lead level in each home.
What is the radon risk for 78266?
78266 is mapped to a county in EPA Radon Zone 3 (low county-level radon potential; EPA recommends testing every home), located in Comal County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.
Are there PFAS (forever chemicals) in 78266's water?
Yes, PFAS have been detected in samples from water systems mapped to 78266. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.
What does the NFIP claim history show for ZIP 78266?
FEMA records contain 22 flood insurance claims filed in ZIP code 78266; the recorded rated-zone value (the most frequent one if there are several claims) is C, which is claims evidence and may differ from the current FEMA map zone for a property. Claim records do not establish current property risk. Review FEMA's map for the specific property.
How to cite this page
ZipCheckup. (2026). San Antonio, TX (78266): PFAS Detected in Mapped Water Systems. https://zipcheckup.com/report/78266/
@misc{zipcheckup-report-78266,
author = {{ZipCheckup}},
title = {{San Antonio, TX (78266): PFAS Detected in Mapped Water Systems}},
year = {2026},
url = {https://zipcheckup.com/report/78266/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 78266
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 78154 | Schertz, TX | 6.2 mi | N/A | 17 |
| 78261 | San Antonio, TX | 7.0 mi | A | 0 |
| 78247 | San Antonio, TX | 7.9 mi | A | 0 |
| 78108 | Cibolo, TX | 8.0 mi | B | 84 |
| 78233 | San Antonio, TX | 8.1 mi | A | 5 |
| 78148 | Universal City, TX | 8.2 mi | A | 5 |
| 78259 | San Antonio, TX | 8.3 mi | A | 0 |
| 78132 | New Braunfels, TX | 9.3 mi | N/A | 191 |
| 78109 | Converse, TX | 10.2 mi | A | 19 |
| 78260 | San Antonio, TX | 10.2 mi | A | 0 |
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