B60/100
CITY OF SAN MARCOS — Water Quality Report 2026
Serving 72,970 people · Texas
Water Source
Surface Water
County
—
System ID
TX1050001
Violations
10
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 220.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2021.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About CITY OF SAN MARCOS
Is CITY OF SAN MARCOS water safe to drink?
CITY OF SAN MARCOS water receives a grade of B (60/100), which is considered good. Out of 69 contaminants tested, none exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CITY OF SAN MARCOS detected?
69 contaminants were tested in CITY OF SAN MARCOS's water. Notable contaminants include Lead (90th percentile), chlorate. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does CITY OF SAN MARCOS have any EPA violations?
Yes, CITY OF SAN MARCOS has 10 EPA violation(s) on record, with the most recent in 2021. Violation types include MR, Other, MCL. 6 are health-based violations.
How many people does CITY OF SAN MARCOS serve?
CITY OF SAN MARCOS serves approximately 72,970 people, Texas.
What type of water does CITY OF SAN MARCOS provide?
CITY OF SAN MARCOS sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is TX1050001.
How does CITY OF SAN MARCOS compare to other utilities in Texas?
CITY OF SAN MARCOS scores 60/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Texas state page for a full comparison of water systems.