Norman Water Hardness & Quality Report (2026)
Water Hardness
4.3 grains per gallon
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
227.9 mg/L
Est. Daily Cost
$0.19
energy & soap waste
Source: See methodology section below · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Norman, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Norman | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.2 yrs | 8.5 yrs | -15% |
| Washing Machine | 10.9 yrs | 12 yrs | -9% |
| Water Heater | 12.7 yrs | 15 yrs | -15% |
Regional Water Comparison
How Norman compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Norman, Oklahoma | 73 mg/L | 53.3 ppt | 🟡 Moderately Hard | reservoir |
| Moore, Oklahoma | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | reservoir |
| Del City, Oklahoma | ≈ 120–179 mg/L | 17.2 ppt | 🟠 Hard | reservoir |
| Midwest City, Oklahoma | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | reservoir |
| Oklahoma City, Oklahoma | ≈ 120–179 mg/L | 1.3 ppt | 🟠 Hard | reservoir |
National Benchmark
How Norman compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Norman | 73 mg/L | 🟡 Low |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Norman's Water Unique?
Local geology and source profile
The City of Norman Utilities Department manages water services for approximately 130,000 residents in Norman, Oklahoma, located in Cleveland County. Water sources include Lake Thunderbird (surface water), the Garber-Wellington well field (groundwater providing about 40% of supply), and purchases from Oklahoma City's Lake Hefner. Treatment occurs at the city's Water Treatment Plant, which processes Lake Thunderbird water with coagulation, softening, and disinfection; well water receives blending and additional treatment as needed.
The watershed for Lake Thunderbird encompasses the North Canadian River basin in central Oklahoma, draining over Permian sedimentary formations including shales and sandstones. The Garber-Wellington Aquifer underlies the region, consisting of the Permian Garber Sandstone (sandstone with interbedded shales) and the underlying Wellington Formation (red shales, gypsum, and dolomite). This geology dissolves calcium, magnesium, and natural arsenic into groundwater, yielding a harder, more mineralised supply from wells that is blended with moderately mineralised lake water to produce a moderately soft combined supply.
At moderately soft blended levels, scale buildup still affects water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Dry skin, soap scum, and spotting on glassware are common household issues. Regular vinegar descaling, low-flow aerators, and flushing heaters help mitigate effects. A whole-home water softener is recommended for optimal appliance performance. Notable contaminants include arsenic (up to 14.4 ppb, exceeding the MCL of 10 ppb from aquifer sources), chromium-6 (39,300 ppt per EWG data), and strontium (up to 442 ppb); treatment involves lime softening, chloramination, and blending to manage contaminants.
Geology & Source: North Canadian River watershed and Permian Garber-Wellington Aquifer — Garber Sandstone and Wellington Formation (shales, gypsum, dolomite); carbonate dissolution yields moderately soft blended supply; natural arsenic in aquifer
Other Oklahoma Water Reports
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Frequently Asked Questions
Is Norman's water safe to drink?
Do I need a water softener in Norman?
How does Norman compare to the USA average?
Data Sources & Methodology
Water quality data for Norman is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.