Tahlequah Water Hardness & Quality Report (2026)
Water Hardness
16.3 grains per gallon
Source
reservoir
pH Level
8.5
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
637.3 mg/L
Est. Daily Cost
$0.75
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 Tahlequah, your appliances are currently losing 37% efficiency due to mineral buildup.
| Appliance | In Tahlequah | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.3 yrs | 12 yrs | -73% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Tahlequah compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Tahlequah, Oklahoma | 279.5 mg/L | 5.2 ppt | 🔴 Very Hard | reservoir |
| Muskogee, Oklahoma | 80.5 mg/L | 2.5 ppt | 🟡 Moderately Hard | reservoir |
| Siloam Springs, Arkansas | 101 mg/L | 3.6 ppt | 🟡 Moderately Hard | river |
| Claremore, Oklahoma | 149.5 mg/L | 3.4 ppt | 🟠 Hard | reservoir |
| Fort Smith, Arkansas | 179 mg/L | 5.1 ppt | 🟠 Hard | river |
National Benchmark
How Tahlequah compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Tahlequah | 279.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Tahlequah's Water Unique?
Local geology and source profile
Tahlequah, Oklahoma, in Cherokee County — the Cherokee County seat and Cherokee Nation capital adjacent to Park Hill and Greasy on the Illinois River in the northeast Oklahoma Ozark Plateau — receives its municipal water from the Tahlequah Water Division, drawing from Lake Tenkiller (Illinois River, Cherokee County) through the Tahlequah treatment plant.
The very hard 279.5 mg/L hardness and elevated TDS of 637.3 mg/L reflect the northeast Oklahoma Illinois River's intense Ozark carbonate character. The Illinois River at Cherokee County drains the Ozark Plateaus — Ordovician Gasconade Dolomite (the dominant Ozark carbonate platform — very high purity dolomite, outcropping across northeast Oklahoma), Mississippian Boone Limestone (high purity carbonate), and Pennsylvanian Muskogee Group (calcareous shale). The cumulative Ozark Ordovician-Mississippian carbonate loading produces the very hard northeast Oklahoma Illinois River supply.
At 279.5 mg/L, Tahlequah's water is very hard. A water softener is strongly recommended. Scale builds rapidly on heating surfaces and appliances, and water heaters require annual descaling without softening. The PFAS level of 5.2 ppt warrants a certified drinking water filter — the Cherokee County northeast Oklahoma light-industrial corridor, the Illinois River agricultural watershed runoff (northwest Arkansas poultry industry — a significant PFAS source in the Illinois River watershed), and the northeast Oklahoma PFAS background contribute to Tahlequah's readings.
Geology & Source: Tahlequah in Cherokee County draws from the Tahlequah Water Division on Lake Tenkiller (Illinois River, Cherokee County, northeast Oklahoma) — the Illinois River drains the Ozark Plateaus (Ordovician Gasconade Dolomite, Mississippian Boone Limestone, Pennsylvanian Muskogee calcareous) — Oklahoma Cherokee County Illinois River Ozark carbonate watershed produces very hard water at 279.5 mg/L with TDS 637.3 mg/L in this Cherokee County Oklahoma city.