Miami Water Hardness & Quality Report (2026)
Water Hardness
18.5 grains per gallon
Source
reservoir
pH Level
8.5
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
768 mg/L
Est. Daily Cost
$0.85
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 Miami, your appliances are currently losing 42% efficiency due to mineral buildup.
| Appliance | In Miami | 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 Miami compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Miami, Oklahoma | 317 mg/L | 5.7 ppt | 🔴 Very Hard | reservoir |
| Joplin, Missouri | 219.5 mg/L | 6.7 ppt | 🔴 Very Hard | river |
| Pittsburg, Kansas | 423 mg/L | 5.7 ppt | 🔴 Very Hard | groundwater |
| Carthage, Missouri | 247 mg/L | 7.4 ppt | 🔴 Very Hard | river |
| Bella Vista, Arkansas | 181 mg/L | 5.1 ppt | 🔴 Very Hard | river |
National Benchmark
How Miami compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Miami | 317 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Miami's Water Unique?
Local geology and source profile
Miami, Oklahoma, in Ottawa County — the Ottawa County seat adjacent to Joplin MO and Grove on the Neosho River in northeast Oklahoma — receives its water from the Miami Water System, drawing from the Neosho River or Grand Lake (Ottawa County) through the northeast Oklahoma distribution.
The extremely hard 317 mg/L hardness and TDS of 768 mg/L make Miami one of the hardest water cities in this dataset — reflecting the Ozark Plateau's extensive Ordovician Gasconade Dolomite and Mississippian Boone Limestone carbonate platform that yields extreme calcareous dissolution, typical of the Tri-State Mining District at the Missouri-Kansas-Oklahoma junction where century-long lead-zinc mining has also elevated dissolved mineral content. The Neosho-Grand watershed at Ottawa County — Ordovician Gasconade Dolomite (highly dolomitic — primary hardness contributor), Mississippian Boone Limestone (calcareous — secondary contributor), and Ordovician Jefferson City Dolomite (dolomitic — tertiary contributor).
At 317 mg/L with TDS 768, Miami's water is extremely hard. A water softener is essential to prevent severe scale damage to all appliances and plumbing. A reverse osmosis system is required for drinking water. The PFAS level of 5.7 ppt warrants a certified drinking water filter — the Ottawa County Tri-State Mining District industrial-mining legacy and northeast Oklahoma industrial corridor contribute to Miami's readings.
Geology & Source: Miami in Ottawa County draws from the Miami Water System on the Neosho River or Grand Lake (Ottawa County, northeast Oklahoma) — the Neosho-Grand watershed drains the Ozark Plateau (Ordovician Gasconade Dolomite — highly dolomitic) and Mississippian Boone Limestone (calcareous) — Oklahoma Ottawa County Ozark Plateau Ordovician-Mississippian dolomitic watershed produces extremely hard water at 317 mg/L with TDS 768 mg/L.