Tap Water Quality Report
Tap water quality in NORMAN, Oklahoma
Tap water in NORMAN, Oklahoma receives a grade of F (59/100) from TapWaterSafety.org. It's served by NORMAN UTILITIES AUTHORITY. The most significant water quality concerns are: Chromium (hexavalent) significantly above health guideline; Arsenic significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in NORMAN's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving NORMAN.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 39.3 ppb, 1967x above the EWG health guideline of 0.02 ppb.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 4.68 ppb, 1170x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 16.7 ppb, 278x above the EWG health guideline of 0.06 ppb.
Recommended filters for NORMAN
Filters matched to the specific contaminants in NORMAN's water supply.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
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 NORMAN'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 |
|---|---|---|---|---|---|---|---|---|
| Chromium (hexavalent) Heavy metal |
39.3 ppb | 0.02 | — | — | — | — | — | 1967× over |
| Arsenic Heavy metal |
4.68 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 1170× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
16.7 ppb | 0.06 | — | — | — | — | — | 278× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
7.85 ppb | 0.1 | 60.0 | 60 | — | — | — | 79× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
5.79 ppb | 0.15 | 80.0 | 100 | — | — | — | 39× over |
| Dichloroacetic acid Disinfection byproduct |
7.1 ppb | 0.2 | — | — | — | — | — | 35× over |
| Radium, combined (-226 and -228) Radiological |
1.63 pCi/L | 0.05 | 5.0 | — | — | — | — | 33× over |
| Bromodichloromethane Disinfection byproduct |
0.798 ppb | 0.06 | — | — | — | — | — | 13× over |
| Uranium Radiological |
4.5 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 10× over |
| Chloroform Disinfection byproduct |
2.75 ppb | 0.4 | — | — | — | — | — | 6.9× over |
| Trichloroacetic acid Disinfection byproduct |
0.611 ppb | 0.1 | — | — | — | — | — | 6.1× over |
| Bromate Disinfection byproduct |
0.602 ppb | 0.1 | 10.0 | 10 | 10 | 0.1 | — | 6.0× over |
| Dibromoacetic acid Disinfection byproduct |
0.121 ppb | 0.03 | — | — | — | — | — | 4.0× over |
| Dibromochloromethane Disinfection byproduct |
0.353 ppb | 0.1 | — | — | — | — | — | 3.5× over |
| Nitrate and nitrite Inorganic |
0.409 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.9× over |
| Nitrate Inorganic |
0.321 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.3× over |
| Vanadium Other |
26.9 ppb | 21.0 | — | — | — | — | — | 1.3× over |
| Simazine Pesticide/Herbicide |
0.0558 ppb | 0.1 | 4.0 | — | — | — | — | Below guideline |
| Barium Heavy metal |
193.5 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Selenium Heavy metal |
5.42 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Bromoform Disinfection byproduct |
0.0417 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
17.5 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Heptachlor epoxide Other |
0.000287 ppb | 0.006 | 0.2 | — | — | — | — | Below guideline |
| Benzo[a]pyrene Other |
0.000217 ppb | 0.007 | 0.2 | — | — | — | — | Below guideline |
| Molybdenum Other |
0.61 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.398 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
1.38 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Endrin Other |
0.000341 ppb | 0.3 | 2.0 | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.0438 ppb | 53.0 | — | — | — | — | — | Below guideline |
| 2,4-D Pesticide/Herbicide |
0.0148 ppb | 20.0 | 70.0 | — | — | — | — | Below guideline |
| Strontium Radiological |
0.423 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.281 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
36.3 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.493 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.00844 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
7.01 ppb | — | — | — | — | — | — | 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 NORMAN UTILITIES AUTHORITY.