- EPA's UCMR 5 testing looked for 30 contaminants here and found 6.
- Lithium: found in 4 of 4 samples, average 16.2 µg/L, highest 21.6 µg/L (EPA UCMR 5 testing, Dec 2023–Sep 2024)
- PFOS (a PFAS): found in 4 of 4 samples, average 6.1 ppt, highest 8.6 ppt (EPA UCMR 5 testing, Dec 2023–Sep 2024) PFOA or PFOS averaged above 4.0 ppt in UCMR 5 testing
- PFHxS (a PFAS): found in 4 of 4 samples, average 4.6 ppt, highest 6.4 ppt (EPA UCMR 5 testing, Dec 2023–Sep 2024)
- PFHxA (a PFAS): found in 3 of 4 samples, average 2.8 ppt, highest 4.9 ppt (EPA UCMR 5 testing, Dec 2023–Sep 2024)
- PFPeA (a PFAS): found in 2 of 4 samples, average 1.9 ppt, highest 4.4 ppt (EPA UCMR 5 testing, Dec 2023–Sep 2024)
- PFBS (a PFAS): found in 1 of 4 samples, average 0.80 ppt, highest 3 ppt (EPA UCMR 5 testing, Dec 2023–Sep 2024)
- Lead, 90th percentile: 2.6 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, 2026–Dec 31, 2026). 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: Surface Water Treatment Rules, Surface Water Treatment Rule, Feb 2023–Sep 2023 (EPA SDWIS)
- Health-based violation: Surface Water Treatment Rules, Surface Water Treatment Rule, Feb 2023–Sep 2023 (EPA SDWIS)
- Health-based violation: Stage 1 Disinfectants and Disinfection Byproducts Rule, CARBON, TOTAL, Oct 2022–Nov 2023 (EPA SDWIS)
- Health-based violation: Stage 1 Disinfectants and Disinfection Byproducts Rule, CARBON, TOTAL, Jul 2022–Nov 2023 (EPA SDWIS)
- Health-based violation: Stage 1 Disinfectants and Disinfection Byproducts Rule, CARBON, TOTAL, Jan 2022–Nov 2023 (EPA SDWIS)
- Health-based violation: Stage 1 Disinfectants and Disinfection Byproducts Rule, CARBON, TOTAL, Oct 2021–Jun 2022 (EPA SDWIS)
Public EPA test results
Can you drink Stillwater tap water? What EPA records show
EPA OK1021220 · serves Payne County, OK · about 53,000 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
Stillwater Utilities Authority (EPA OK1021220)
ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026. For Stillwater's main utility, Stillwater Utilities Authority: 6 health-based violations since July 1, 2021 in EPA records (EPA SDWIS). This water system averaged above 4.0 ppt for PFOA or PFOS in EPA's UCMR 5 testing.
What EPA records show for Stillwater Utilities Authority, as of October 14, 2026
6 health-based violations since July 1, 2021 in EPA records (EPA SDWIS).
Lead, 90th percentile: 2.6 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, 2026–Dec 31, 2026). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
This water system averaged above 4.0 ppt for PFOA or PFOS in EPA's UCMR 5 testing.
EPA's UCMR 5 testing looked for 30 contaminants here and found 6.
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 Stillwater Utilities Authority use chloramine?
We didn't find chloramine in Stillwater 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)
Source: EPA SDWIS (ECHO SDWA bulk download), data as of Oct 14, 2026
Source: EPA UCMR 5 occurrence data, data as of Oct 15, 2026
These are EPA's public records for this water system, shown as of October 14, 2026. If you represent this utility, or think a record here is wrong, tell us: Report an error. If the error is in EPA's own records, your state drinking water program can correct it there, and this page updates at our next data refresh.
Sources
- EPA ECHO detailed facility report: Stillwater Utilities Authority (OK1021220), July to September 2026 extract
- EPA SDWIS (ECHO SDWA bulk download), July to September 2026 extract
- EPA UCMR 5 occurrence data, samples through June 2026
Questions people ask
Is Stillwater tap water safe to drink?
We don't give a safe or unsafe verdict. Here is what the public data shows: EPA records for Stillwater's main utility, Stillwater Utilities Authority, as of October 14, 2026. 6 health-based violations since July 1, 2021 in EPA records (EPA SDWIS). This water system averaged above 4.0 ppt for PFOA or PFOS in EPA's UCMR 5 testing. Under EPA's 2024 PFAS rule, water systems must meet the PFOA and PFOS limits (4.0 ppt each) by April 2029; in May 2026 EPA proposed allowing extensions to April 2031. Results before then are monitoring data, not violations. A guideline and a legal limit are different things, and this is public data, not a test of your tap.
Which utility supplies water in Stillwater?
Stillwater Utilities Authority is the main utility for Stillwater in EPA's records (EPA OK1021220), serving about 53,000 people (EPA SDWIS). Your water bill names your utility.
Does Stillwater tap water contain PFAS?
This water system averaged above 4.0 ppt for PFOA or PFOS in EPA's UCMR 5 testing. PFOS (a PFAS): found in 4 of 4 samples, average 6.1 ppt, highest 8.6 ppt (EPA UCMR 5 testing, Dec 2023–Sep 2024). Under EPA's 2024 PFAS rule, water systems must meet the PFOA and PFOS limits (4.0 ppt each) by April 2029; in May 2026 EPA proposed allowing extensions to April 2031. Results before then are monitoring data, not violations. This is public data, not a test of your tap.
How recent is this data?
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026. Data may be one to three years old and may not reflect the water at your tap. If you want your own tap tested, use a state-certified laboratory.
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