Water Quality in San Antonio, TX (77990)
EPA violation data for public water systems serving ZIP code 77990.
Active Health Violations
13 health-based violations found in the past 5 years, with at least one still unresolved. Contaminant levels have exceeded federal safety limits. Consider testing your tap water independently.
More violations than 76% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
590
Population
8
Water Systems
17
Violations (5yr)
13
Health-Based
Location
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Water Systems Serving This Area (8)
Valley-Hi
Great Northwest Utility Co
City Of Port Lavaca
13 health-basedSouthwest Utiltiy Co-Westwood
Valencia Water Company
Refugio County Wcid 1
Pan American Restaurant
Riverside Campground
Contaminants Found
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
Lead & Copper Levels
Lead (Pb)
Within limitSampled: Jul 2025
How Does This Compare?
San Antonio (77990) has more violations than 76% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 17.
Recommended Water Filters
Based on health-based violations detected in your area, these filter types are commonly used to address similar contaminants. Consult your water utility's Consumer Confidence Report for the most current data.
Activated Carbon Filter
Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.
Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor
Look for:NSF/ANSI 42 & 53 certified
Always look for filters certified by NSF International for the specific contaminants you want to remove. This is general educational information, not an endorsement of any specific product.