Tap Water Quality Report
Tap water quality in Oklahoma City, Oklahoma
Tap water in Oklahoma City, Oklahoma receives a grade of C (70/100) from TapWaterSafety.org. It's served by OKLAHOMA CITY. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in Oklahoma City's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving Oklahoma City.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 38.1 ppb, 635x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 54.7 ppb, 365x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 30.5 ppb, 305x above the EWG health guideline of 0.1 ppb.
EPA compliance record
Official U.S. EPA records for OKLAHOMA CITY (system ID OK1020902) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for Oklahoma City
Filters matched to the specific contaminants in Oklahoma City's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in Oklahoma City's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
38.1 ppb | 0.06 | — | — | — | — | — | 635× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
54.7 ppb | 0.15 | 80.0 | 100 | — | — | — | 365× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
30.5 ppb | 0.1 | 60.0 | 60 | — | — | — | 305× over |
| Bromodichloromethane Disinfection byproduct |
10.4 ppb | 0.06 | — | — | — | — | — | 173× over |
| Trichloroacetic acid Disinfection byproduct |
12.7 ppb | 0.1 | — | — | — | — | — | 127× over |
| Chloroform Disinfection byproduct |
40.8 ppb | 0.4 | — | — | — | — | — | 102× over |
| Dichloroacetic acid Disinfection byproduct |
16.5 ppb | 0.2 | — | — | — | — | — | 82× over |
| Dibromoacetic acid Disinfection byproduct |
0.892 ppb | 0.03 | — | — | — | — | — | 30× over |
| Dibromochloromethane Disinfection byproduct |
2.67 ppb | 0.1 | — | — | — | — | — | 27× over |
| Radium, combined (-226 and -228) Radiological |
1.18 pCi/L | 0.05 | 5.0 | — | — | — | — | 24× over |
| Bromate Disinfection byproduct |
2.2 ppb | 0.1 | 10.0 | 10 | 10 | 0.1 | — | 22× over |
| Chromium (hexavalent) Heavy metal |
0.115 ppb | 0.02 | — | — | — | — | — | 5.7× over |
| Nitrate and nitrite Inorganic |
0.236 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.7× over |
| Nitrate Inorganic |
0.233 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.7× over |
| Bromoform Disinfection byproduct |
0.629 ppb | 0.5 | — | — | — | — | — | 1.3× over |
| Vanadium Other |
2.3 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
67.5 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
1.46 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
1.18 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.412 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
1.3 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0137 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.293 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.575 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.0649 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
42.6 ppb | — | — | — | — | — | — | Below guideline |
| Nitrite Inorganic |
0.00338 ppm | — | 1.0 | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from OKLAHOMA CITY.
General Contact
Treatment Plant
ZIP codes served
Oklahoma City's public water systems serve the following ZIP codes: