Water hardness in Chubbuck
18 gpg very hard
Tap water in Chubbuck is very hard: 18 gpg (308 mg/L · 17.2 °dH · 30.8 °fH).
Source: Idaho Drinking Water Watch, chemical sample results, system ID6030008 (2022-08) · data checked 2026-10-19
Range across supply zones: 295–427 mg/L.
This figure is over 3 years old; hardness may have changed.
The Chubbuck figure comes from Idaho's Drinking Water Watch portal for the City of Chubbuck system. It rests on 4 samples from 2022: a median of 307.5 mg/L as CaCO3 (18.0 gpg), with a range of 295 to 427 mg/L. The sample is small and dated. On this data the water is very hard, and scale builds fast.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 18 gpg |
|---|---|
| Utility | Chubbuck City Of |
How Chubbuck compares
- Tap water in Chubbuck is 98 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 237 of 1372 in the United States (1 = hardest); 83 % of these cities have softer water.
- In Idaho it is number 1 of 9 cities; the regional median is 9.4 gpg.
Ranking of the hardest and softest water in the United States →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Chubbuck
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 17 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| Hoover | S3 |
| LG | H3 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Chubbuck water hard or soft?
It is very hard: 308 mg/L as CaCO₃ (18 gpg, 17.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Chubbuck safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
How many grains per gallon is Chubbuck water?
18 gpg, equal to 17.2 °dH, 30.8 °fH or 308 mg/L calcium carbonate.
What dishwasher salt setting should I use in Chubbuck?
For 308 mg/L (17.2 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Chubbuck?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Idaho Drinking Water Watch, chemical sample results, system ID6030008 (2022-08). Method: own measurement. Idaho Drinking Water Watch, chemical sample results, system ID6030008 · Outdated figure? Tell us