Guthrie Water Hardness & Quality Report (2026)
Water Hardness
4.5 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
115.3 mg/L
Est. Daily Cost
$0.20
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 Guthrie, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Guthrie | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.1 yrs | 8.5 yrs | -16% |
| Washing Machine | 10.8 yrs | 12 yrs | -10% |
| Water Heater | 12.5 yrs | 15 yrs | -17% |
Regional Water Comparison
How Guthrie compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Guthrie, Oklahoma | 76.5 mg/L | 2.5 ppt | 🟡 Moderately Hard | reservoir |
| Edmond, Oklahoma | 98 mg/L | 2.8 ppt | 🟡 Moderately Hard | reservoir |
| Warr Acres, Oklahoma | 206 mg/L | 4.2 ppt | 🔴 Very Hard | reservoir |
| Choctaw, Oklahoma | 94.5 mg/L | 2.7 ppt | 🟡 Moderately Hard | reservoir |
| Bethany, Oklahoma | 388 mg/L | 6.6 ppt | 🔴 Very Hard | reservoir |
National Benchmark
How Guthrie compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Guthrie | 76.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Guthrie's Water Unique?
Local geology and source profile
Guthrie, Oklahoma, in Logan County — the Logan County seat adjacent to Edmond and Langston in north-central Oklahoma — receives its water from the City of Guthrie Water Department, drawing from Guthrie Lake and Cottonwood Creek through the north-central Oklahoma distribution.
The soft 76.5 mg/L hardness and low TDS of 115.3 mg/L reflect the Logan County Guthrie Lake supply's soft Permian Basin character — the Pennsylvanian Garber Sandstone is largely insoluble quartz sandstone, while the Permian Chase Group contributes modest calcareous mineral content from its calcareous mudstone and limestone beds (compare Edmond OK: 74/110 in Oklahoma County comparable; Langston OK: 78/120 in Logan County comparable; Guthrie consistent soft from the same Logan County Guthrie Lake Pennsylvanian-Permian supply). The Cimarron watershed at Logan County — Pennsylvanian Garber Sandstone (insoluble — primary dilutant), Permian Chase Group (slightly calcareous — primary hardness contributor), and Quaternary Cimarron alluvium (slightly calcareous — minor TDS).
At 76.5 mg/L with TDS 115, Guthrie's water is soft — minimal scale buildup. Annual descaling is appropriate. The PFAS level of 2.5 ppt is very low — an excellent result for north-central Oklahoma. Review the City of Guthrie's annual water quality report.
Geology & Source: Guthrie in Logan County draws from the City of Guthrie Water on Guthrie Lake reservoir (Logan County, north-central Oklahoma) — the Cimarron watershed at Logan County drains Pennsylvanian Garber Sandstone (insoluble) and Permian Chase Group (slightly calcareous) — Oklahoma Logan County Guthrie Lake Pennsylvanian-Permian supply produces soft water at 76.5 mg/L with TDS 115.3 mg/L.