- EPA's UCMR 5 testing looked for 30 contaminants here and found 5.
- Lithium: found in 8 of 8 samples, average 12.9 µg/L, highest 14.2 µg/L (EPA UCMR 5 testing, Oct 2023–Jul 2024)
- PFBA (a PFAS): found in 7 of 8 samples, average 5.4 ppt, highest 7.5 ppt (EPA UCMR 5 testing, Oct 2023–Jul 2024)
- PFPeA (a PFAS): found in 5 of 8 samples, average 2.2 ppt, highest 3.8 ppt (EPA UCMR 5 testing, Oct 2023–Jul 2024)
- PFHpA (a PFAS): found in 3 of 8 samples, average 1.2 ppt, highest 3.4 ppt (EPA UCMR 5 testing, Oct 2023–Jul 2024)
- PFHxA (a PFAS): found in 2 of 8 samples, average 0.80 ppt, highest 3.3 ppt (EPA UCMR 5 testing, Oct 2023–Jul 2024)
- Lead, 90th percentile: 0 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2022–Dec 31, 2024). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
- Health-based violation: Stage 1 Disinfectants and Disinfection Byproducts Rule, CARBON, TOTAL, from Oct 2024, with no return-to-compliance action in EPA records (EPA SDWIS)
- Health-based violation: Stage 1 Disinfectants and Disinfection Byproducts Rule, CARBON, TOTAL, from Jul 2024, with no return-to-compliance action in EPA records (EPA SDWIS)
- Health-based violation: Stage 1 Disinfectants and Disinfection Byproducts Rule, CARBON, TOTAL, from Apr 2024, with no return-to-compliance action in EPA records (EPA SDWIS)
- Health-based violation: Stage 1 Disinfectants and Disinfection Byproducts Rule, CARBON, TOTAL, from Jan 2024, with no return-to-compliance action in EPA records (EPA SDWIS)
- Health-based violation: Stage 2 Disinfectants and Disinfection Byproducts Rule, TTHM, from Jan 2023, with no return-to-compliance action in EPA records (EPA SDWIS)
Public EPA test results
Can you drink Duncan tap water? What EPA records show
EPA OK1010809 · serves Stephens County, OK · about 23,000 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
Duncan Public Utilities Authority (EPA OK1010809)
ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026. For Duncan's main utility, Duncan Public Utilities Authority: 5 health-based violations since July 1, 2021 in EPA records (EPA SDWIS). PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
What EPA records show for Duncan Public Utilities Authority, as of October 14, 2026
5 health-based violations since July 1, 2021 in EPA records (EPA SDWIS).
Lead, 90th percentile: 0 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2022–Dec 31, 2024). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 5.
PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Duncan Public Utilities Authority use chloramine?
We didn't find chloramine in Duncan Public Utilities Authority's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)