Is Elgin, OK tap water safe?
The short answer
2 of the 2 utilities serving Elgin have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Oklahoma’s records: Caddo Co RWD #3 and Elgin Pwa.
Caddo Co RWD #3, which serves the most people here, has 4 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 20 ppb, above EPA’s health benchmark. 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 Elgin’s ZIP codes, from EPA’s estimates.
- Open report
Caddo Co RWD #3
Oklahoma · serves 3,900 people · about 180 in Elgin
4 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 20 ppb, above EPA’s health benchmark.
1 health-based violation since 2016
- Open report
Elgin Pwa
Oklahoma · serves 3,300 people · about 110 in Elgin
2 results above the health goal. The worst: Arsenic at 1.8 ppb, above the health goal.
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 Caddo Co RWD #3’s water, which serves the most people here. Another utility’s report names what handles its own results.
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Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Nitrate, Arsenic, Lead
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Nitrate, Arsenic, Lead
Culligan 10-Cup Pitcher with ZeroWater Technology (ZEROP10)
Pitcher
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
Certified for: Nitrate, Lead
Water testing near Elgin
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 Elgin
Which ZIP codes are in Elgin: 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 Elgin
Towns nearby with a page of their own.
What to do next
- Read Caddo Co RWD #3’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About LithiumWhat it does to health, where it comes from, and the certification claim that addresses it.About Lithium
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water