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Tap water quality report

Norman, OK

EPA monitoring detected 37 contaminants across the 3 water suppliers serving Norman. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

3
water suppliers
139,153
people served
37
contaminants found
Oklahoma rankings Lead in Oklahoma PFAS in Oklahoma

What was found in Norman's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate-Nitrite
2280 µg/L 23%
of the EPA limit 10000 µg/L
 2/3 SYR4
Nitrate
1350 µg/L 14%
of the EPA limit 10000 µg/L
 2/3 SYR4
Fluoride
1090 µg/L 27%
of the EPA limit 4000 µg/L
 1/3 SYR4
Barium
894 µg/L 45%
of the EPA limit 2000 µg/L
 2/3 SYR4
Nitrite
415 µg/L 42%
of the EPA limit 1000 µg/L
 1/3 SYR4
Copper
186 µg/L 14%
of the EPA limit 1300 µg/L
 3/3 SYR4
Chromium
98.1 µg/L 98%
of the EPA limit 100 µg/L
 2/3 SYR4
TTHM
57.28 µg/L 72%
of the EPA limit 80 µg/L
 2/3 SYR4
Gross Alpha, Excl. Radon And U
48.8 pCi/L 325%
of the EPA limit, in the worst sample — 15 pCi/L
 2/3 SYR4
Chloroform
46.2 µg/L
No EPA limit set
 2/3 SYR4
Combined Uranium
35.462 µg/L 118%
of the EPA limit, in the worst sample — 30 µg/L
 2/3 SYR4
Arsenic
30.4 µg/L 304%
of the EPA limit, in the worst sample — 10 µg/L
 1/3 SYR4
Total Haloacetic Acids (HAA5)
24.55 µg/L 41%
of the EPA limit 60 µg/L
 2/3 SYR4
Selenium
21.7 µg/L 43%
of the EPA limit 50 µg/L
 1/3 SYR4
Dichloroacetic Acid
19 µg/L
No EPA limit set
 2/3 SYR4
Cyanide
18.3 µg/L 9.2%
of the EPA limit 200 µg/L
 1/3 SYR4
Lithium
17.7 µg/L
No EPA limit set
 1/3 UCMR-5
Gross Beta Particle Activity
16.1 pCi/L
No EPA limit set
 2/3 SYR4
Toluene
11.6 µg/L 1.2%
of the EPA limit 1000 µg/L
 1/3 SYR4
Bromodichloromethane
8.7 µg/L
No EPA limit set
 2/3 SYR4
Lead
8 µg/L 53%
of the EPA limit 15 µg/L
 2/3 SYR4
Dibromochloromethane
7.1 µg/L
No EPA limit set
 2/3 SYR4
Trichloroacetic Acid
5.55 µg/L
No EPA limit set
 2/3 SYR4
Combined Radium (-226 And -228)
4.93 pCi/L 99%
of the EPA limit 5 pCi/L
 2/3 SYR4
Monochloroacetic Acid
3.7 µg/L
No EPA limit set
 2/3 SYR4
Antimony, Total
3.67 µg/L 61%
of the EPA limit 6 µg/L
 1/3 SYR4
Dibromoacetic Acid
1.47 µg/L
No EPA limit set
 2/3 SYR4
Simazine
1.4 µg/L 35%
of the EPA limit 4 µg/L
 1/3 SYR4
Di(2-ethylhexyl) Phthalate
1.1 µg/L 18%
of the EPA limit 6 µg/L
 1/3 SYR4
Dichloromethane
0.6100 µg/L 12%
of the EPA limit 5 µg/L
 1/3 SYR4
Thallium, Total
0.4000 µg/L 20%
of the EPA limit 2 µg/L
 1/3 SYR4
2,4-D
0.3000 µg/L 0.4%
of the EPA limit 70 µg/L
 1/3 SYR4
Pentachlorophenol
0.1600 µg/L 16%
of the EPA limit 1 µg/L
 1/3 SYR4
Cadmium
0.1440 µg/L 2.9%
of the EPA limit 5 µg/L
 1/3 SYR4
Pfba
0.0075 µg/L
No EPA limit set
 1/3 UCMR-5
PFBS
0.0030 µg/L
No EPA limit set
 1/3 UCMR-5
Lead
0.0016 mg/L 11%
of the EPA limit 0.0150 mg/L
 3/3 LCR
Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Norman

SupplierPopulation served
NORMAN UTILITIES AUTHORITY 104,868
OKLAHOMA UNIVERSITY 34,000
WILDFIRE ESTATES HOMEOWNERS 285

Frequently asked questions about Norman tap water

Is Norman tap water safe to drink?

EPA testing detected 37 contaminants in the water serving Norman. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Norman?

3 public water suppliers report drinking-water monitoring for Norman, Oklahoma to the EPA. Each is listed above with its population served.

What contaminants are in Norman's water?

The contaminants EPA monitoring detected in Norman include Nitrate-Nitrite, Nitrate, Fluoride, Barium, Nitrite. The full list, with the highest level found and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.