Shawnee Water Hardness & Quality Report (2026)
Water Hardness
5.4 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
145.1 mg/L
Est. Daily Cost
$0.25
energy & soap waste
Source: USGS Water Quality Portal · 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 Shawnee, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Shawnee | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.5 yrs | 8.5 yrs | -24% |
| Washing Machine | 10.2 yrs | 12 yrs | -15% |
| Water Heater | 11.9 yrs | 15 yrs | -21% |
Regional Water Comparison
How Shawnee compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Shawnee, Oklahoma | 92.5 mg/L | 2.7 ppt | 🟡 Moderately Hard | reservoir |
| Midwest City, Oklahoma | 326 mg/L | 5.8 ppt | 🔴 Very Hard | reservoir |
| Norman, Oklahoma | 132.5 mg/L | 3.2 ppt | 🟠 Hard | reservoir |
| Del City, Oklahoma | 315 mg/L | 5.7 ppt | 🔴 Very Hard | reservoir |
| Moore, Oklahoma | 351.5 mg/L | 6.1 ppt | 🔴 Very Hard | reservoir |
National Benchmark
How Shawnee compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Shawnee | 92.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Shawnee's Water Unique?
Local geology and source profile
Shawnee, Oklahoma, the Pottawatomie County seat — a major central Oklahoma university city (Shawnee is the Pottawatomie County seat — an important central Oklahoma city at the junction of I-40 and US-270; Shawnee is home of Oklahoma Baptist University (a significant Baptist-affiliated liberal arts university in central Oklahoma), St. Gregory's University (a Benedictine Catholic institution, now closed), and is known as a significant center of Baptist religious life in Oklahoma), home of the Potawatomi Tribe of Oklahoma (the Citizen Potawatomi Nation is headquartered in Shawnee — one of the most significant tribal nations in Oklahoma, with significant economic development including the FireLake Grand Casino and Resort), a diverse Pottawatomie County community with a significant Native American (Citizen Potawatomi, Seminole, Kickapoo), working-class, and Baptist religious community population, and adjacent to the North Canadian River valley — draws its municipal water supply from the North Canadian River (Lake Shawnee) via the City of Shawnee Water Division. Water hardness in Shawnee measures 92.5 mg/L — classified as moderately soft.
Shawnee's moderate softness reflects the Pottawatomie County North Canadian River watershed's calcareous-moderate geology with effective treatment. The North Canadian River watershed at Shawnee–Pottawatomie County drains the Pennsylvanian McAlester and Savanna Formations (calcareous-moderate). City of Shawnee treatment produces the moderately soft 92.5 mg/L.
With hardness at 92.5 mg/L, Shawnee residents enjoy moderately soft water. City of Shawnee Water Division consistently delivers water meeting all Oklahoma DEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the North Canadian River (Lake Shawnee watershed) via the City of Shawnee Water Division — the Pottawatomie County central Oklahoma Canadian River Valley (Pennsylvanian calcareous-moderate McAlester and Savanna Formations — the calcareous-moderate central Oklahoma carboniferous terrain; Pottawatomie County supply with treatment); moderately soft supply at 92.5 mg/L in Pottawatomie County.