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Seguin, TX Tap Water Quality 2026

Water quality report for Seguin, TX — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Seguin's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: City Of Seguin PWSID: TX0940002 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 1.45 ppb, 10% of the action level and no violations are open. No PFAS was detected.

B

Seguin earns a B for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 1.45 ppb — 10% of the federal action level
PFAS tested, none detected
4 violations since 2015, 4 health-based
No violations currently open
Seguin's lead level vs. all Texas community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 1.45 ppb — 10% of the federal action level
✓ Lower lead than 58% of Texas utilities
Population Served
22917
~10912 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
4 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
10% of EPA action level
1.45 ppb
Action level: 15 ppb
The 90th-percentile lead result is 1.45 ppb, 10% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2024 Resolved
TTHM MCL EXCEEDANCE 0.09 MG/L 0.080 mg/L 2016 Resolved
TTHM MCL EXCEEDANCE 0.081 MG/L 0.080 mg/L 2016 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.062 MG/L 0.060 mg/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

4 violations are on record since 2015, of which 4 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility City Of Seguin
PWSID TX0940002
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 22,917
Service connections 10,912
Systems serving this area 4
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Seguin tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 1.45 ppb, 10% of the action level.
Does Seguin water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Seguin? ▼
City Of Seguin (PWSID TX0940002), one of 4 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2025-07-16. No significant deficiencies were recorded.

What Should Seguin Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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