Drinking water quality · 2024
· Verified
· PWSID OK1020902
What's in Oklahoma City, OK tap water
Every one of the 10 core regulated contaminants reported for Oklahoma City, OK came in below its federal limit.
- !1 contaminant within 20% of a limit
- !10 of 27 core regulated contaminants reported — 17 never appear in this report
- ✓Nothing over a federal limit
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −0 contaminants at or above a federal limit
- −4 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −14 core regulated contaminants never reported (10/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- TTHM86% of the federal limit69 ug/L · limit 80 ug/L
Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
higher than 90% of U.S. systems
+12 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| HAA5 | 36 ug/L | 60 ug/L |
| Combined Radium | 3 pCi/L | 5 pCi/L |
| Lead | 0.0041 mg/L | 0.015 mg/L |
| Copper | 0.2016 mg/L | 1.3 mg/L |
| Fluoride | 0.58 mg/L | 4 mg/L |
| Gross Alpha | 2.14 pCi/L | 15 pCi/L |
| Nitrate | 0.598 mg/L | 10 mg/L |
| Barium | 0.092 mg/L | 2 mg/L |
| Lithium | 42.6 ug/L | — |
| Total Coliform | 2.08 % | — |
| Gross Beta Particle Activity | 6.17 pCi/L | — |
| PFPeA | 4.7 ng/L | — |
What this report doesn't tell you
17 of the 27 contaminants a community water system normally reports do not appear anywhere in Oklahoma City, OK's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound detected in Oklahoma City, OK
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
PFPeA
● Detected (no federal limit)Where your water comes from · EPA SDWIS
Oklahoma City, OK's drinking water comes from surface water, drawn from 3 sources.
Source
- LAKE HEFNER
- LAKE ATOKA
- DRAPER LK
Treatment
- OKC HEFNER WTP
- OKC DRAPER WTP
Distribution
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Treatment technique violationHealth-based6 violations on record · most recent Jan 2012resolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗