Water hardness in La Verne
19.3 gpg very hard
Tap water in La Verne is very hard: 19.3 gpg (330 mg/L · 18.5 °dH · 33 °fH).
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA1910062 (2025-05) · data checked 2026-10-19
Range across supply zones: 293–405 mg/L.
The La Verne figure comes from State Water Resources Control Board lab results for the La Verne city water district. The median of 14 results from 2022 to 2025, taken at 8 well points, is 330 mg/L as CaCO3 (19.3 gpg), with a range of 293 to 405 mg/L. This is very hard water. Scale builds fast, and a softener is worth serious consideration.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 19.3 gpg |
|---|---|
| Utility | La Verne, City Wd |
How La Verne compares
- Tap water in La Verne is 113 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 168 of 1372 in the United States (1 = hardest); 87 % of these cities have softer water.
- In California it is number 33 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly softer water: Claremont, 5 km away (12 gpg).
- Nearest city with clearly harder water: Torrance, 63 km away (26.8 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 La Verne
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 18 °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 La Verne water hard or soft?
It is very hard: 330 mg/L as CaCO₃ (19.3 gpg, 18.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in La Verne 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 La Verne water?
19.3 gpg, equal to 18.5 °dH, 33 °fH or 330 mg/L calcium carbonate.
What dishwasher salt setting should I use in La Verne?
For 330 mg/L (18.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in La Verne?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA1910062 (2025-05). Method: own measurement. California SWRCB Division of Drinking Water, EDT lab results, system CA1910062 · Outdated figure? Tell us