Kuna Water Hardness & Quality Report (2026)
Water Hardness
6.3 grains per gallon
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
255.3 mg/L
Est. Daily Cost
$0.29
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 Kuna, your appliances are currently losing 14% efficiency due to mineral buildup.
| Appliance | In Kuna | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.1 yrs | 8.5 yrs | -28% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 11.3 yrs | 15 yrs | -25% |
Regional Water Comparison
How Kuna compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Kuna, Idaho | 107 mg/L | 2.2 ppt | 🟡 Moderately Hard | reservoir |
| Meridian, Idaho | 113.5 mg/L | 2.3 ppt | 🟡 Moderately Hard | reservoir |
| Nampa, Idaho | 53.5 mg/L | 1.5 ppt | 🟢 Soft | reservoir |
| Eagle, Idaho | 61.5 mg/L | 1.6 ppt | 🟡 Moderately Hard | reservoir |
| Boise, Idaho | 53.5 mg/L | 1.4 ppt | 🟢 Soft | reservoir |
National Benchmark
How Kuna compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Kuna | 107 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Kuna's Water Unique?
Local geology and source profile
Kuna, Idaho, in Ada County — an Ada County city adjacent to Nampa and Boise in the southwest Idaho Treasure Valley — receives its municipal water from the City of Kuna Water Division, drawing from the Eastern Snake River Plain Aquifer through local production wells in Ada County.
The moderately hard 107 mg/L hardness and TDS of 255.3 mg/L reflect the Snake River Plain aquifer's basaltic character with moderate mineral loading. The Eastern Snake River Plain Aquifer is developed in Quaternary Columbia River Basalt Group (slightly calcareous basalt with minor carbonate interbeds) and Pliocene lacustrine sediment (calcareous silt). The Snake River Plain aquifer is generally soft (much softer than carbonate aquifer regions), with moderate hardness coming from the thin calcareous interbeds and lacustrine calcareous deposits.
At 107 mg/L, Kuna's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 2.2 ppt is very low — the Ada County rural southwest Idaho Treasure Valley agricultural setting, limited industrial PFAS sources in the Kuna area, and the remote Snake River Plain aquifer's natural filtration produce Kuna's very clean PFAS profile.
Geology & Source: Kuna in Ada County draws from Kuna City Water on the Snake River Plain aquifer (Ada County, Idaho) — the Snake River Plain aquifer is developed in Quaternary basalt and Pliocene lacustrine sediment over the Columbia River Basalt Group — Idaho Ada County Snake River Plain basalt aquifer produces moderately hard water at 107 mg/L with TDS 255.3 mg/L in this Ada County Idaho city.