We read 15 results from Oklahoma City’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 644,000 people · Water system ID OK1020902 · Read the district’s 2025 report (opens in a new tab)
Open this district in the water lookupCompare with your own test results, see the district map and get matched filters.
Results from the 2025 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Copper90th percentile of homes tested, 0 over the action level · Customer taps (August 2025) · 2025 report, page 5 | 0.6 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal2x the health goal |
| PFOA (a PFAS)average · range ND to 2.02 · printed as 0.000505 ppb · Hefner plant (UCMR 5) · 2025 report, page 5 | 0.51 ppt | 0.007 ppt | 4 ppt from 2029 | Above the health goal72x the health goal |
| Total coliform bacteriahighest month · Distribution system · 2025 report, page 5 | 1.25 % positive | 0 % positive | 5 % positive | Above the health goalThe health goal is zero |
| Arsenichighest measured · sampled 2022 · Both plants · 2025 report, page 5 | Not detected | 0.004 ppb | 10 ppb | Not detected |
| Bariumhighest measured · sampled 2022 · Draper plant, highest of 2 sources · 2025 report, page 5 | 0.09 ppm | 2 ppm | 2 ppm | Below the health goal |
| Bromatehighest running annual average · Hefner plant · 2025 report, page 5 | Not detected | 0.1 ppb | 10 ppb | Not detected |
| Chloramineaverage · range 2.98 to 3.87 · Hefner plant, highest of 2 sources · 2025 report, page 5 | 3.57 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range 7.74 to 32.4 · Distribution system · 2025 report, page 5 | 32.4 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 21.1 to 64.5 · Distribution system · 2025 report, page 5 | 64.5 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · Draper plant, highest of 2 sources · 2025 report, page 5 | 0.67 ppm | 1 ppm | 4 ppm | Below the health goal |
| Lead90th percentile of homes tested, 0 over the action level · Customer taps (August 2025) · 2025 report, page 5 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)highest measured · Hefner plant, highest of 2 sources · 2025 report, page 5 | 0.68 ppm | 10 ppm | 10 ppm | Below the health goal |
| Turbidity (cloudiness)highest measured · Hefner plant, highest of 2 sources · 2025 report, page 5 | 0.27 NTU | None set | 1 NTU | Below the legal limit |
| Lithiumaverage · range 60.8 to 67.8 · Hefner plant (UCMR 5), highest of 2 sources · 2025 report, page 5 | 64.2 ppb | None set | None | No health limit |
| PFPeA (a PFAS)average · range ND to 4.66 · printed as 0.00277 ppb · Hefner plant (UCMR 5) · 2025 report, page 5 | 2.77 ppt | None set | None | No health limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Oklahoma City’s water between Jan 2024 and Oct 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium67.8 ppbFound in 5 of 8 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
Copper
Found: Copper
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFOA (a PFAS)
What removes it: Reverse osmosis.
Bacteria and viruses
Found: Total coliform bacteria
What removes it: UV purification (and tell your utility).
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