We read 14 results from Norman Utilities Authority’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 100,939 people · Water system ID OK1020801 · Read the district’s 2025 report (opens in a new tab)
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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 |
|---|---|---|---|---|
| Arsenichighest measured · range ND to 9.7 · Entry points · 2025 report, page 2 | 9.7 ppb | 0.004 ppb | 10 ppb | Above the health goal2,425x the health goal |
| Gross alpha (radioactivity)highest measured · Entry points · 2025 report, page 3 | 1.28 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Gross beta (radioactivity)highest measured · Entry points · 2025 report, page 3 | 4.15 pCi/L | 0 pCi/L | 50 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of homes tested · Customer taps · 2025 report, page 2 | 0.55 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal2.8x the health goal |
| Radium (combined 226 + 228)highest measured · Entry points · 2025 report, page 3 | 1.83 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range 0.12 to 0.25 · Entry points · 2025 report, page 2 | 0.25 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chromium (total)highest measured · range 46 to 58 · Entry points · 2025 report, page 2 | 58 ppb | None set | 100 ppb | Below the legal limit |
| Copper90th percentile of homes tested · Customer taps · 2025 report, page 2 | 0.14 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 9.3 · Distribution system · 2025 report, page 2 | 9 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range ND to 12.2 · Distribution system · 2025 report, page 2 | 12 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.32 to 0.67 · Entry points · 2025 report, page 2 | 0.67 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · Entry points · 2025 report, page 2 | 0.9 ppm | 10 ppm | 10 ppm | Below the health goal |
| Seleniumhighest measured · range 2.7 to 16 · Entry points · 2025 report, page 2 | 16 ppb | 30 ppb | 50 ppb | Below the health goal |
| Sodiumhighest measured · range 25 to 130 · Entry points · 2025 report, page 3 | 130 ppm | 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. 1 number we weren’t sure about is held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Norman Utilities Authority’s water between Oct 2023 and Mar 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFBS3 pptFound in 3 of 34 samples · highest resultNo federal limit in force for this one
- Lithium17.7 ppbFound in 19 of 34 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.
Radium and uranium
Found: Gross alpha (radioactivity), Gross beta (radioactivity), Radium (combined 226 + 228)
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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