Tap Water Results

Is Denison, 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 Denison.

2 public water systems serve parts of Denison. The largest, City of Denison, serves 27,500 people. Your water bill names your system.

Largest system

City of Denison

27,500 people · Surface water · EPA ID TX0910003

PFASHighest averageLimitStatus
PFOA
Not detected
–4 pptNot detected
PFOS
Not detected
–4 pptNot detected
PFHxS
Not detected
–10 pptNot detected
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: 1.82 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: 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.

Denison homes and lead pipes

66%
of homes built before 1980 (Texas 33%, US 50%)
25%
built before 1950 (Texas 6%)
41%
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. 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 Denison city (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Denison

  • Bryan County Rws & Swmd #2
    6,270 people · Surface water · Oklahoma · reported ZIPs here
    Total trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violation

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Sherman 10 mi
City of Sherman
City of ShermanNone above limits0 ppb
Anna 29 mi
City of Anna
City of AnnaNone above limits0 ppb
Melissa 33 mi
City of Melissa
City of MelissaNone above limits1.43 ppb
Celina 34 mi
Mustang Special Utility District
Mustang Special Utility DistrictNone above limits1.33 ppb
Prosper 39 mi
Town of Prosper
Town of ProsperNone above limits1.98 ppb
Princeton 39 mi
City of Princeton
City of PrincetonNone above limits1.76 ppb
Denison ZIP codes (1)
  • 75020

Questions

Is Denison tap water safe to drink?

City of Denison 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 Denison, TX?

2 public water systems serve parts of Denison. The largest is City of Denison (27,500 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Denison tap water have PFAS?

None detected above EPA's reporting limits. City of Denison 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 Denison homes have lead pipes?

Census estimates put 66% of Denison 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 Denison'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.