Kokomo Water Hardness & Quality Report (2026)
Water Hardness
15.6 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
695.6 mg/L
Est. Daily Cost
$0.71
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 Kokomo, your appliances are currently losing 36% efficiency due to mineral buildup.
| Appliance | In Kokomo | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.7 yrs | 12 yrs | -69% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Kokomo compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Kokomo, Indiana | 267 mg/L | 8.7 ppt | 🔴 Very Hard | river |
| Logansport, Indiana | 143 mg/L | 4.2 ppt | 🟠 Hard | river |
| Frankfort, Indiana | 148.5 mg/L | 4.4 ppt | 🟠 Hard | river |
| Westfield, Indiana | 142.5 mg/L | 4.2 ppt | 🟠 Hard | river |
| Noblesville, Indiana | 219.5 mg/L | 6.9 ppt | 🔴 Very Hard | river |
National Benchmark
How Kokomo compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Kokomo | 267 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Kokomo's Water Unique?
Local geology and source profile
Kokomo, Indiana, the Howard County seat — a major north-central Indiana industrial city historically significant as an automobile manufacturing pioneer (Elwood Haynes built one of the first American automobiles here in 1894), now a major Stellantis/Chrysler transmission manufacturing hub — draws its municipal water supply from the Silurian Niagaran Dolomite (Wabash Formation) and White River alluvial aquifer via the City of Kokomo Utilities Water Division. Water hardness in Kokomo measures 267 mg/L — classified as very hard.
Kokomo's very hard supply reflects the Howard County Indiana Silurian carbonate platform — one of the hardest groundwater regions in the Midwest. The Silurian Niagaran Group (Wabash Formation dolomite — the dominant Silurian aquifer of north-central Indiana) is a highly reactive dolomite that produces extremely hard groundwater when dissolved at depth. North-central Indiana (Kokomo, Marion, Muncie) represents the core of the Indiana Silurian carbonate platform — the Wabash Formation is thickest and most reactive in this zone, contributing maximum dissolved dolomite ($CaMg(CO_3)_2$) to the aquifer. Additionally, the White River valley glaciofluvial outwash carries calcareous recharge from the calcareous Wisconsin Age till of the north-central Indiana drumlin field.
At 267 mg/L, Kokomo residents face significant hard water challenges. Scale deposits form rapidly on all fixtures and tile — monthly descaling with citric acid solution is essential maintenance. City of Kokomo Utilities Water Division consistently delivers water meeting all Indiana IDEM and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Silurian Niagaran Dolomite (Wabash Formation) and White River Valley alluvial aquifer via the City of Kokomo Utilities Water Division — the Howard County Indiana Silurian carbonate platform; very hard supply at 267 mg/L — reflecting the pure Silurian Niagaran dolomite aquifer of north-central Indiana.