F3/100
Seguin Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 68,208 residents · Texas
What's In Seguin's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
2
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 480.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
0
Unresolved
2
Health-Related
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 2, 2024 – September 12, 2024Enforcement: Resolving — corrective action underway
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: July 1, 2024 – September 30, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
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
Water Utility Details
CITY OF SEGUIN
Population Served
32,736
Water Source
Surface Water
System ID
TX0940002
SPRINGS HILL SUD
Population Served
35,472
Water Source
Surface Water
System ID
TX0940022
Frequently Asked Questions About Seguin Water
Is Seguin tap water safe to drink?
Seguin, Texas tap water receives a grade of F (3/100), which is considered failing. 0 contaminant(s) exceed EPA maximum contaminant levels and 107 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Seguin's water?
Of the 69 contaminants tested in Seguin's water supply, the most notable include Lead (90th percentile), chlorate. No contaminants exceed EPA legal limits. 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Seguin have any water quality violations?
Yes, Seguin has 107 EPA violation(s) on record, with the most recent in 2024. Violation types include MCL, Other, MR. 36 of these are health-based violations, which are the most serious category.
Do I need a water filter in Seguin?
Seguin water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 2 contaminant(s) exceed these stricter goals.
Where does Seguin's tap water come from?
Seguin's drinking water is sourced from surface water and supplied by CITY OF SEGUIN and 1 other water system(s). The system serves approximately 68,208 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Seguin's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Seguin's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Seguin's water compare to other cities in Texas?
Seguin's water quality score of 3/100 earns a grade of F, which is considered failing. This is a concerning score that suggests significant water quality issues. Visit our Texas state page to see how all cities in the state compare.
What should I do if I'm concerned about Seguin's water quality?
If you have concerns about Seguin's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (CITY OF SEGUIN) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.