Water Quality in San Marcos, TX (78623)
EPA violation data for public water systems serving ZIP code 78623.
Past Health-Based Violations
10 health-based violations were found in the past 5 years, meaning contaminant levels exceeded federal safety limits. All have since been resolved. There are also 20 monitoring/reporting violations.
More violations than 84% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
1,645
Population
13
Water Systems
30
Violations (5yr)
10
Health-Based
Location
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Water Systems Serving This Area (13)
New Braunfels Utilities
All resolvedCity Of San Marcos
City Of Kyle
Clwsc Canyon Lake Shores
3 health-basedTexas State University - San Marcos
Goforth Sud
2 health-basedSjwtx Triple Peak Plant
All resolvedCounty Line Sud
All resolvedEagles Peak Ranch Wsc
5 health-basedBuckhorn Ranch Inc
John Knox Ranch Camp
Fischer Store Community Center
Was Rileys On The Backbone
Contaminants Found
Missed testing deadlines — not a detection of bacteria.
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
Annual water quality report delivery requirement.
Used to disinfect water — generally safe at regulated levels.
Lead & Copper Levels
Lead (Pb)
Within limitSampled: Jan 2025
How Does This Compare?
San Marcos (78623) has more violations than 84% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 30.
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.