Coeur d'Alene Water Hardness & Quality Report (2026)
Water Hardness
3.5 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
114.1 mg/L
Est. Daily Cost
$0.16
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 Coeur d'Alene, your appliances are currently losing 8% efficiency due to mineral buildup.
| Appliance | In Coeur d'Alene | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.6 yrs | 8.5 yrs | -11% |
| Washing Machine | 11.4 yrs | 12 yrs | -5% |
| Water Heater | 13.2 yrs | 15 yrs | -12% |
Regional Water Comparison
How Coeur d'Alene compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Coeur d'Alene, Idaho | 60 mg/L | 1.5 ppt | 🟡 Moderately Hard | reservoir |
| Hayden, Idaho | 104 mg/L | 2.2 ppt | 🟡 Moderately Hard | reservoir |
| Post Falls, Idaho | 46 mg/L | 1.3 ppt | 🟢 Soft | reservoir |
| Spokane Valley, Washington | 55.5 mg/L | 2.5 ppt | 🟢 Soft | reservoir |
| Opportunity, Washington | 35 mg/L | 1.9 ppt | 🟢 Soft | reservoir |
National Benchmark
How Coeur d'Alene compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Coeur d'Alene | 60 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Coeur d'Alene home
Shop water softeners on Amazon.com →
What Makes Coeur d'Alene's Water Unique?
Local geology and source profile
Coeur d'Alene, Idaho, the Kootenai County seat on Lake Coeur d'Alene — the major Idaho Panhandle city, a premier resort community known as the 'resort on the lake,' home of North Idaho College, and a rapidly growing Northwest recreation and retirement community with proximity to Spokane, Washington — draws its municipal water supply from Lake Coeur d'Alene via the City of Coeur d'Alene Water Utility. Water hardness in Coeur d'Alene measures 60 mg/L — classified as moderately soft.
Coeur d'Alene's moderate softness reflects the Lake Coeur d'Alene watershed's calcium-poor geology. The Lake Coeur d'Alene watershed drains: the Idaho Panhandle Precambrian Belt Supergroup (Wallace Formation and Revett Formation — the famous silver-rich Belt Supergroup metasedimentary rocks of the Silver Valley; these are primarily quartzite, argillite, and metasiltstone — calcareous-poor despite their sedimentary origin); the Selkirk Mountains granite (Cretaceous Kaniksu Batholith — calcium-poor granodiorite of the Idaho Batholith northern extension); and the St. Maries River tributary drainage. The Belt Supergroup calcareous-poor metasedimentary terrain and granitic watershed produce the moderate 60 mg/L at Coeur d'Alene.
With hardness at 60 mg/L, Coeur d'Alene residents enjoy moderately soft water. City of Coeur d'Alene Water Utility consistently delivers water meeting all Idaho DEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: Lake supply from Lake Coeur d'Alene via the City of Coeur d'Alene Water Utility — the Kootenai County Idaho Panhandle (Precambrian Belt Supergroup calcareous-poor metasedimentary terrain and the Selkirk Mountains granite); moderately soft supply at 60 mg/L — reflecting the Belt Supergroup and Selkirk Mountains calcium-poor watershed.