Shawnee Water Hardness & Quality Report (2026)
Water Hardness
20.3 grains per gallon
Source
groundwater
pH Level
8.5
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
1044 mg/L
Est. Daily Cost
$0.93
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 45% efficiency due to mineral buildup.
| Appliance | In Shawnee | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3 yrs | 12 yrs | -75% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Shawnee compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Shawnee, Kansas | 347.5 mg/L | 4.8 ppt | 🔴 Very Hard | groundwater |
| Overland Park, Kansas | 374.5 mg/L | 5.1 ppt | 🔴 Very Hard | groundwater |
| Lenexa, Kansas | 383 mg/L | 5.2 ppt | 🔴 Very Hard | groundwater |
| Prairie Village, Kansas | 146 mg/L | 2.5 ppt | 🟠 Hard | groundwater |
| Kansas City, Kansas | 314.5 mg/L | 4.4 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Shawnee compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Shawnee | 347.5 mg/L | 🔴 High |
| 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, Kansas, in Johnson County — one of the Kansas City metro's fastest-growing suburbs west of I-435, home of Shawnee Mission Park — draws its municipal water supply from the Kansas River (Kaw River) via the City of Shawnee Department of Public Works (sourcing from Kansas City Water Services or through the Johnson County Water District's Kansas River source). The Kansas River drains an enormous Great Plains basin from the Colorado Rockies to the Missouri River. Water hardness in Shawnee reaches 347.5 mg/L — classified as very hard, reflecting the highly calcareous Kansas River drainage.
Shawnee's extreme hardness reflects the Kansas River's exceptional calcareous geology accumulated across its 743-mile journey from the Colorado Rockies. The Kansas River above Kansas City drains: the Permian Chase Group and Sumner Group (Kansas Flint Hills — highly reactive calcareous limestone and chalky shale — one of the most calcareous geological provinces in the Great Plains); the Cretaceous Greenhorn Limestone and Niobrara Chalk (western Kansas calcareous formations); the Pennsylvanian Shawnee Group and Douglas Group limestone (calcareous limestone — from which the Shawnee County takes its name via the namesake geological group); and the Quaternary calcareous loess of the Kansas River valley. The Flint Hills Permian limestone dissolution along the Republican, Smoky Hill, and Solomon River tributaries is the primary driver of the extreme 347.5 mg/L Kansas River hardness.
At 347.5 mg/L, Shawnee residents face severe hard water challenges. Heavy scale deposits form rapidly on all fixtures and surfaces — weekly to bi-weekly descaling is essential. Water heaters need semi-annual professional inspection. City of Shawnee Department of Public Works consistently delivers water meeting all Kansas KDHE and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Kansas River (Kaw River) via the City of Shawnee Department of Public Works Water Division and Kansas City Water Services — the Kansas River basin draining the Kansas–Nebraska Permian and Pennsylvanian calcareous formations, Cretaceous Greenhorn and Niobrara Chalk, and the Great Plains calcareous glacial loess; very hard supply at 347.5 mg/L in Johnson County.