Water hardness in Boulder City
15.5 gpg very hard
Tap water in Boulder City is very hard: 15.5 gpg (265 mg/L · 14.8 °dH · 26.5 °fH).
Source: Nevada Drinking Water Watch, chemical sample results, system NV0000011 (2021-04) · data checked 2026-10-19
Range across supply zones: 261–269 mg/L.
This figure is over 3 years old; hardness may have changed.
The Boulder City figure comes from Nevada's Drinking Water Watch portal, which lists lab results for the city system. It rests on only 2 samples from 2020 and 2021: a median of 265 mg/L as CaCO3 (15.5 gpg), within a narrow range of 261 to 269 mg/L. The data is older and thin. On this evidence the water is very hard.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 15.5 gpg |
|---|---|
| Utility | Boulder City |
How Boulder City compares
- Tap water in Boulder City is 71 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 345 of 1372 in the United States (1 = hardest); 75 % of these cities have softer water.
- In Nevada it is number 3 of 4 cities; the regional median is 15.9 gpg.
- Nearest city with clearly harder water: Needles, 117 km away (20.2 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 Boulder City
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 15 °dH |
| AEG / Electrolux | 4 |
| Beko | 4th |
| Hoover | S2 |
| 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 Boulder City water hard or soft?
It is very hard: 265 mg/L as CaCO₃ (15.5 gpg, 14.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Boulder City 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 Boulder City water?
15.5 gpg, equal to 14.8 °dH, 26.5 °fH or 265 mg/L calcium carbonate.
What dishwasher salt setting should I use in Boulder City?
For 265 mg/L (14.8 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Boulder City?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Nevada Drinking Water Watch, chemical sample results, system NV0000011 (2021-04). Method: own measurement. Nevada Drinking Water Watch, chemical sample results, system NV0000011 · Outdated figure? Tell us