Water Quality in SAN ANTONIO, TX (78261)

EPA violation data for public water systems serving ZIP code 78261.

Total Violations

Health-Based

Monitoring / Reporting

Resolved

What does this mean?

17 of 20 violations have been resolved. 2 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 18 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.

Water systems: 2 Population served: 35

Violations Detail (20 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 15, 2025	Active	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 15, 2025	Active	N/A
E. COLI	Monitoring	0	N/A	Jul 16, 2025	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Public Notice	Monitoring	N/A	N/A	Oct 31, 2024	Active	N/A
Nitrate	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Public Notice	Monitoring	N/A	N/A	Jul 31, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 28, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 28, 2021	Resolved	N/A

Violation Timeline

2025(3)

Revised Total Coliform Rule

Aug 15Active

Revised Total Coliform Rule

Aug 15Active

E. COLI

Jul 16Resolved

2024(1)

Public Notice

Oct 31Active

How Does This Compare?

SAN ANTONIO (78261) has 20 recorded violations, including 2 health-based. 3 remain unresolved. Consider testing your tap water independently for added peace of mind.

Recommended Water Filters

Based on the contaminants detected in your area, these filter types may help improve your water quality.

Reverse Osmosis System

One of the few filtration methods effective at removing nitrates and nitrites. Essential for households with infants.

Targets:Nitrate, Nitrite, Dissolved Solids

Look for:NSF/ANSI 58 certified

NSF Certified Products → EPA Safe Drinking Water Guide →

UV Water Purifier

Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.

Targets:E. coli, Coliform, Giardia, Cryptosporidium

Look for:NSF/ANSI 55 (Class A) certified

NSF Certified Products → EPA Safe Drinking Water Guide →

Always look for filters certified by NSF International for the specific contaminants you want to remove.