Oklahoma City Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

neutral = 7.0

Lead

0.002 mg/L

✓ Below action level

TDS

406.6 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · est.

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 Oklahoma City, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Oklahoma City	Soft Water City	Efficiency Loss
Kettle	6.8 yrs	8.5 yrs	-20%
Washing Machine	9.6 yrs	12 yrs	-20%
Water Heater	12 yrs	15 yrs	-20%

Regional Water Comparison

How Oklahoma City compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Oklahoma City, Oklahoma	≈ 120–179 mg/L	1.3 ppt	🟠 Hard	reservoir
Del City, Oklahoma	≈ 120–179 mg/L	17.2 ppt	🟠 Hard	reservoir
Warr Acres, Oklahoma	≈ 120–179 mg/L	4.2 ppt	🟠 Hard	reservoir
Midwest City, Oklahoma	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Bethany, Oklahoma	≈ 120–179 mg/L	58.6 ppt	🟠 Hard	mixed

National Benchmark

How Oklahoma City compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Oklahoma City	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Oklahoma City's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 406.6 mg/LpH: 8

Oklahoma City Water Utilities Trust serves Oklahoma City and surrounding areas in Oklahoma County, including Moore, Norman, and Edmond. The utility sources water from multiple reservoirs: Hefner and Stanley Draper locally, plus allocations from northwest Oklahoma reservoirs, McGee Creek, and Atoka Reservoir in the southeast. Treatment occurs at plants processing this surface water through conventional methods including coagulation, sedimentation, filtration, and disinfection to meet EPA standards.

The watershed encompasses the North Canadian River basin and southeast Oklahoma tributaries, with limestone-dominated formations from the Pennsylvanian Arbuckle Group and Permian rocks contributing dissolved minerals. Paleozoic and Mesozoic sedimentary strata — including limestones, sandstones, and shales — are rich in calcium and magnesium-bearing minerals that weather into runoff and reservoirs. The karstic and evaporitic rock types prevalent in central Oklahoma's Arbuckle and Wichita Mountains uplifts further drive the hard character of the blended supply.

Hard water promotes significant scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan, with white deposits on fixtures and soap scum contributing to dry skin or hair. Regular vinegar descaling helps mitigate buildup, but a water softener is recommended to prevent long-term damage and improve appliance performance. The 2024 Consumer Confidence Report confirms compliance with all EPA limits, including no violations for lead or copper; disinfection byproducts range 0.02–0.11 ppm, treatment involves chlorination, and ongoing monitoring ensures all parameters meet standards.

Geology & Source: Paleozoic and Mesozoic sedimentary formations — Permian, Pennsylvanian limestones, sandstones, and shales; karstic Arbuckle Group and evaporitic rocks dissolve calcium and magnesium into reservoirs, producing hard water

Hardness Varies Across Oklahoma City — Find Your Area

City average is ≈ 120–179 mg/L. Individual ZIP areas differ.

* ZIP code estimates are derived from the city-wide measurement. Actual readings may vary slightly by neighbourhood.

ZIP Code	Neighbourhood	Hardness (mg/L)	Risk Level
73102	Downtown	≈ 149	🟠 Hard
73103	Midtown	≈ 149	🟠 Hard
73107	Western Avenue	≈ 149	🟠 Hard
73116	Nichols Hills area	≈ 149	🟠 Hard
73104	Northeast	≈ 150	🟠 Hard
73106	Paseo Arts District	≈ 150	🟠 Hard
73108	South OKC	≈ 150	🟠 Hard
73112	Northwest	≈ 150	🟠 Hard
73120	North Oklahoma City	≈ 150	🟠 Hard
73105	Northeast OKC	≈ 151	🟠 Hard
73109	South Side	≈ 151	🟠 Hard
73111	Northeast	≈ 151	🟠 Hard

Other Oklahoma Water Reports

Del City

≈ 120–179 mg/L

🟠 Hard

Warr Acres

≈ 120–179 mg/L

🟠 Hard

Midwest City

≈ 120–179 mg/L

🟠 Hard

Bethany

≈ 120–179 mg/L

🟠 Hard

Report an Issue

Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Oklahoma City's water safe to drink?

Yes. Oklahoma City's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Oklahoma City?

At ≈ 120–179 mg/L (Hard), Oklahoma City's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does Oklahoma City compare to the USA average?

The USA national average is 151 mg/L. Oklahoma City (≈ 120–179 mg/L) is 1 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Oklahoma City is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

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.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

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.

Measured

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.

Modelled

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.

Calculated

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.