Is Seguin, TX tap water safe?
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data for City of Seguin. 2 PFAS were detected below the limits.
City of Seguin supplies Seguin (32,736 people).
Water system
City of Seguin
32,736 people · Surface water · EPA ID TX0940002
Buys treated water from Schertz Seguin Local Government Water System.
| PFAS | Highest average | Limit |
|---|---|---|
| PFOA Not detected | – | 4 ppt |
| PFOS Not detected | – | 4 ppt |
| PFHxS Not detected | – | 10 ppt |
| PFNA Not detected | – | 10 ppt |
| HFPO-DA (GenX) Not detected | – | 10 ppt |
ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.
Lead: 1.45 ppb at the 90th percentile (Dec 2025, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 3
Across Texas, 28 of 1,130 water systems EPA tested had PFAS above a 2024 federal limit, and 13 systems were above the lead action level in results from the last five years. Texas results.
Seguin homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for Seguin city (tables B25034, B25003). Estimates for small places have a margin of error.
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| New Braunfels 12 mi New Braunfels Utilities | None above limits | 1.7 ppb |
| Cibolo 15 mi Green Valley Special Utility District | None above limits | 1.8 ppb |
| Schertz 17 mi Green Valley Special Utility District | None above limits | 1.8 ppb |
| San Marcos 20 mi City of San Marcos | None above limits | 1.63 ppb |
| Converse 21 mi Green Valley Special Utility District | None above limits | 1.8 ppb |
| Kyle 28 mi City of Austin Water & Wastewater | None above limits | 0 ppb |
Seguin ZIP codes (1)
- 78155
Questions
Is Seguin tap water safe to drink?
City of Seguin had 3 health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.
Who supplies water in Seguin, TX?
City of Seguin, which serves 32,736 people.
Does Seguin tap water have PFAS?
City of Seguin had 2 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.
Do Seguin homes have lead pipes?
Census estimates put 39% of Seguin homes as built before 1980 (Texas: 33%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. City of Seguin's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.