Is Katy, 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 Katy.
City of Katy supplies Katy (25,253 people).
Water system
City of Katy
25,253 people · Groundwater · EPA ID TX1010017
Buys treated water from Fort Bend County Municipal Utility District 37.
| 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: 2.7 ppb at the 90th percentile (Nov 2026, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0
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.
Katy homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for Katy city (tables B25034, B25003). Estimates for small places have a margin of error.
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Fulshear 7 mi City of Fulshear | None above limits | 0 ppb |
| Rosenberg 17 mi City of Rosenberg | None above limits | 1.87 ppb |
| Sugar Land 18 mi City of Sugar Land | None above limits | 1.51 ppb |
| Missouri City 24 mi Quail Valley Utility District | None above limits | 0 ppb |
| Houston 27 mi City of Houston | None above limits | 5 ppb |
| Pearland 35 mi City of Pearland | None above limits | 2.1 ppb |
Katy ZIP codes (1)
- 77493
Questions
Is Katy tap water safe to drink?
City of Katy has had no 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 Katy, TX?
City of Katy, which serves 25,253 people.
Does Katy tap water have PFAS?
None detected above EPA's reporting limits. City of Katy had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.
Do Katy homes have lead pipes?
Census estimates put 20% of Katy 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 Katy'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.