Is Owasso, OK tap water safe?

Data: U.S. EPA · How we read the data · How we check it

No federal limits exceeded in EPA data for Washington County Rural Water District #3 (New,#1).

4 public water systems serve parts of Owasso. The largest, Washington County Rural Water District #3 (New,#1), serves 25,375 people. Your water bill names your system.

Largest system

Washington County Rural Water District #3 (New,#1)

25,375 people · Surface water · EPA ID OK1021418

Buys treated water from Tulsa Water System.

PFAS	Highest average	Limit	Status
PFOA Not detected	–	4 ppt	Not detected
PFOS Not detected	–	4 ppt	Not detected
PFHxS Not detected	–	10 ppt	Not detected
PFNA Not detected	–	10 ppt	Not detected
HFPO-DA (GenX) Not detected	–	10 ppt	Not 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 (Dec 2025, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0

Across Oklahoma, 8 of 167 water systems EPA tested had PFAS above a 2024 federal limit, and 5 systems were above the lead action level in results from the last five years. Oklahoma results.

Owasso homes and lead pipes

16%

of homes built before 1980 (Oklahoma 49%, US 50%)

built before 1950 (Oklahoma 12%)

37%

of households rent (Oklahoma 34%)

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

Other water systems serving Owasso

Owasso Water System
23,000 people · Purchased surface water · Oklahoma · lists this city
No PFAS above limitsAlso: 1 health-based violation since 2016
Rogers County Rural Water District # 3 Cot Sta
10,750 people · Purchased surface water · Oklahoma · reported ZIPs here
Coliform bacteria violation
Rogers County Rural Water District # 3 Lake Plant
10,470 people · Surface water · Oklahoma · reported ZIPs here
Total trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violations

How nearby cities compare

City	Main water system	PFAS	Lead (90th pct.)
Tulsa 12 mi Tulsa Water System	Tulsa Water System	None above limits	1.53 ppb
Broken Arrow 18 mi Broken Arrow Municipal Authority	Broken Arrow Municipal Authority	Above limit	0 ppb
Jenks 21 mi Jenks Public Works Authority	Jenks Public Works Authority	None above limits	1.1 ppb
Bixby 24 mi Bixby Public Works Authority	Bixby Public Works Authority	None above limits	1.4 ppb
Bartlesville 32 mi Bartlesville Water System	Bartlesville Water System	None above limits	3.6 ppb
Muskogee 46 mi Muskogee Municipal Authority	Muskogee Municipal Authority	None above limits	5.4 ppb

Owasso ZIP codes (1)

74055

Questions

Is Owasso tap water safe to drink?

Washington County Rural Water District #3 (New,#1) 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 Owasso, OK?

4 public water systems serve parts of Owasso. The largest is Washington County Rural Water District #3 (New,#1) (25,375 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Owasso tap water have PFAS?

None detected above EPA's reporting limits. Washington County Rural Water District #3 (New,#1) 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 Owasso homes have lead pipes?

Census estimates put 16% of Owasso homes as built before 1980 (Oklahoma: 49%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Washington County Rural Water District #3 (New,#1)'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.