Is Cedar Valley, OK tap water safe?
The short answer
2 of the 2 utilities serving Cedar Valley have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Oklahoma’s records: Guthrie and Logan Co RWD #1.
Guthrie, which serves the most people here, has 1 result above the limit’s level with no violation recorded and 1 result above the health goal. The worst: Total trihalomethanes (TTHM) at 82.4 ppb, above the limit’s level, no violation. Health goals are stricter than legal limits and are not enforced.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Cedar Valley’s ZIP codes, from EPA’s estimates.
- Open report
Guthrie
Oklahoma · serves 9,925 people · under 100 in Cedar Valley
1 result above the limit’s level with no violation recorded and 1 result above the health goal. The worst: Total trihalomethanes (TTHM) at 82.4 ppb, above the limit’s level, no violation.
3 health-based violations since 2016
- Open report
Logan Co RWD #1
Oklahoma · serves 8,907 people · under 100 in Cedar Valley
1 result above EPA’s new limit, which takes effect in 2029, 2 results above the health goal and 1 result above EPA’s health benchmark. The worst: PFOA at 4.3 ppt, above EPA’s new limit, which takes effect in 2029.
1 health-based violation since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in Guthrie’s water, which serves the most people here. Another utility’s report names what handles its own results.
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Aquasana Clean Water Machine (AQ-CWM2)
Countertop
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
Certified for: Total trihalomethanes (TTHM), Lead
Brita Hub Countertop Water Filter System (87340)
Countertop
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
- IAPMO listing:NSF/ANSI 53checked Oct. 9, 2026
Certified for: Total trihalomethanes (TTHM), Lead
Ninja HydraSense Countertop Water Filtration System (WF1001)
Countertop
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
Certified for: Total trihalomethanes (TTHM), Lead
Water testing near Cedar Valley
TapBuff hasn’t read Oklahoma’s list of certified labs yet. The national page links every state’s own list.
Certified labs, state by stateZIP codes in Cedar Valley
Which ZIP codes are in Cedar Valley: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology.
Near Cedar Valley
Towns nearby with a page of their own.
What to do next
- Read Guthrie’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About Total trihalomethanes (TTHM)What it does to health, where it comes from, and the certification claim that addresses it.About Total trihalomethanes (TTHM)
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water