Water Quality Report · Updated May 12, 2026
Oklahoma City Department of Public Works
Oklahoma City Department of Public Works delivers tap water graded C (73/100) by TapWaterSafety.org. The utility serves approximately 655,000 residents in Oklahoma City, Oklahoma using surface water from the Lake Hefner/Lake Stanley Draper. The most significant water quality concerns are: Haloacetic Acids (HAA5) significantly above health guideline; Chromium-6 detected. For questions, the utility can be reached at (405) 994-9778.
Is Oklahoma City tap water safe to drink?
Oklahoma City Department of Public Works delivers tap water that earns a grade of C (73/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 655,000 residents in Oklahoma City, drawing from surface water (Lake Hefner/Lake Stanley Draper) and disinfecting with chloramine.
Public testing data identifies 15 contaminants in this water above EWG's health-based guidelines, including: Haloacetic Acids (HAA5), Haloacetic Acids (HAA5), Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs), Total Trihalomethanes (TTHMs), Total Trihalomethanes (TTHMs), Nitrate, Nitrate, Nitrate, Chromium-6 (Hexavalent), Chromium-6 (Hexavalent), Chromium-6 (Hexavalent), Lead, Lead, Lead. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for Oklahoma City residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for Oklahoma City Department of Public Works.
Haloacetic Acids (HAA5) significantly above health guideline
Moderate concernHaloacetic Acids (HAA5) detected at 26.1 ppb, 261x above the EWG health guideline of 0.1 ppb.
Chromium-6 detected
Moderate concernChromium-6 detected at 0.09 ppb.
Contact Oklahoma City Department of Public Works
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Water Quality Contact
For questions about contaminants, test results, or your Consumer Confidence Report.
Treatment Plant
Recommended water filters for Oklahoma City
Filters matched to the specific contaminants in this water supply.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Reverse Osmosis
$249-$750Chromium-6 requires reverse osmosis for reliable removal. Standard carbon filters do not address it.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 73/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (HAA5) Disinfection byproduct |
26.1 ppb | 0.1 | 60 | 60 | — | — | 2022 | 261× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
26.0 ppb | 0.1 | 60 | 60 | — | — | 2023 | 260× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
21.5 ppb | 0.1 | 60 | 60 | — | — | 2024 | 215× over |
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
59.7 ppb | 0.6 | 80 | 100 | — | — | 2022 | 100× over |
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
53.7 ppb | 0.6 | 80 | 100 | — | — | 2023 | 90× over |
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
49.3 ppb | 0.6 | 80 | 100 | — | — | 2024 | 82× over |
| Nitrate Inorganic |
1.47 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 2023 | 10× over |
| Nitrate Inorganic |
1.2 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 2024 | 8.6× over |
| Nitrate Inorganic |
0.87 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 2022 | 6.2× over |
| Chromium-6 (Hexavalent) Heavy metal |
0.104 ppb | 0.02 | — | — | — | 0.02 | 2022 | 5.2× over |
| Chromium-6 (Hexavalent) Heavy metal |
0.102 ppb | 0.02 | — | — | — | 0.02 | 2023 | 5.1× over |
| Chromium-6 (Hexavalent) Heavy metal |
0.09 ppb | 0.02 | — | — | — | 0.02 | 2024 | 4.5× over |
| Lead Heavy metal |
0.9 ppb | 0 | 15 | 5 | 10 | 0.2 | 2024 | — |
| Lead Heavy metal |
0.835 ppb | 0 | 15 | 5 | 10 | 0.2 | 2023 | — |
| Lead Heavy metal |
0.801 ppb | 0 | 15 | 5 | 10 | 0.2 | 2022 | — |
| Contaminant | Detected (2024) | EWG | EPA | EU DWD | WHO | CA PHG | Status |
|---|---|---|---|---|---|---|---|
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
49.3 ppb | 0.6 | 80 | 100 | — | — | 82× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
21.5 ppb | 0.1 | 60 | 60 | — | — | 215× over |
| Lead Heavy metal |
0.9 ppb | 0 | 15 | 5 | 10 | 0.2 | — |
| Chromium-6 (Hexavalent) Heavy metal |
0.09 ppb | 0.02 | — | — | — | 0.02 | 4.5× over |
| Nitrate Inorganic |
1.2 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 8.6× over |
| Contaminant | Detected (2023) | EWG | EPA | EU DWD | WHO | CA PHG | Status |
|---|---|---|---|---|---|---|---|
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
53.7 ppb | 0.6 | 80 | 100 | — | — | 90× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
26.0 ppb | 0.1 | 60 | 60 | — | — | 260× over |
| Lead Heavy metal |
0.835 ppb | 0 | 15 | 5 | 10 | 0.2 | — |
| Chromium-6 (Hexavalent) Heavy metal |
0.102 ppb | 0.02 | — | — | — | 0.02 | 5.1× over |
| Nitrate Inorganic |
1.47 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 10× over |
| Contaminant | Detected (2022) | EWG | EPA | EU DWD | WHO | CA PHG | Status |
|---|---|---|---|---|---|---|---|
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
59.7 ppb | 0.6 | 80 | 100 | — | — | 100× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
26.1 ppb | 0.1 | 60 | 60 | — | — | 261× over |
| Lead Heavy metal |
0.801 ppb | 0 | 15 | 5 | 10 | 0.2 | — |
| Chromium-6 (Hexavalent) Heavy metal |
0.104 ppb | 0.02 | — | — | — | 0.02 | 5.2× over |
| Nitrate Inorganic |
0.87 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 6.2× over |
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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database, and Oklahoma City Department of Public Works's Consumer Confidence Report.
Oklahoma City Department of Public Works service area
This water system serves 1 community in Oklahoma County, Oklahoma. Click any city for its dedicated tap water quality page.
Find the right filter for Oklahoma City water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.