Tap Water Results

Is Deer Park, 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 Deer Park. 6 PFAS were detected below the limits.

City of Deer Park supplies Deer Park (34,495 people).

Water system

City of Deer Park

34,495 people · Purchased surface water · EPA ID TX1010007

Buys treated water from City of Houston.

PFASHighest averageLimitStatus
PFOA
Not detected
–4 pptNot detected
PFOS
One sample above limit
2.2 ppt4 pptOne sample above limit
PFHxS
Detected, below limit
0.9 ppt10 pptDetected, below limit
PFNA
Not detected
–10 pptNot detected
HFPO-DA (GenX)
Not detected
–10 pptNot detected

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: 0 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: 1

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.

Deer Park homes and lead pipes

46%
of homes built before 1980 (Texas 33%, US 50%)
2%
built before 1950 (Texas 6%)
22%
of households rent (Texas 37%)

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 Deer Park city (tables B25034, B25003). Estimates for small places have a margin of error.

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Pasadena 3 mi
City of Pasadena
City of PasadenaNone above limits3.72 ppb
La Porte 4 mi
City of la Porte
City of la PorteNone above limits2.35 ppb
Baytown 10 mi
City of Baytown
City of BaytownAbove limit2.1 ppb
Friendswood 13 mi
City of Friendswood
City of FriendswoodNone above limits4.61 ppb
League City 14 mi
City of League City
City of League CityNone above limits3 ppb
Pearland 15 mi
City of Pearland
City of PearlandNone above limits2.1 ppb
Deer Park ZIP codes (1)
  • 77536

Questions

Is Deer Park tap water safe to drink?

City of Deer Park had 1 health-based violation 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 Deer Park, TX?

City of Deer Park, which serves 34,495 people.

Does Deer Park tap water have PFAS?

City of Deer Park had 6 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.

Do Deer Park homes have lead pipes?

Census estimates put 46% of Deer Park 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 Deer Park'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.