Water hardness in Loma Linda
12.6 gpg very hard
Tap water in Loma Linda is very hard: 12.6 gpg (215 mg/L · 12 °dH · 21.5 °fH).
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA3610013 (2025-11) · data checked 2026-10-19
The Loma Linda figure is the finished-water median from State Water Resources Control Board lab results for the city system: 215 mg/L as CaCO3 (12.6 gpg), from 26 results between 2021 and 2025. We show no range, because the published range mixes in much softer source samples. The utility's own report was not located, so confidence is moderate. 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 | 12.6 gpg |
|---|---|
| Utility | Loma Linda, City Of |
How Loma Linda compares
- Tap water in Loma Linda is 39 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 477 of 1372 in the United States (1 = hardest); 65 % of these cities have softer water.
- In California it is number 106 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly softer water: Redlands, 7 km away (5.5 gpg).
- Nearest city with clearly harder water: Big Bear Lake, 39 km away (18.4 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 Loma Linda
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 12 °dH |
| AEG / Electrolux | 3 |
| Beko | 3rd |
| Hoover | S2 |
| LG | H2 |
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 Loma Linda water hard or soft?
It is very hard: 215 mg/L as CaCO₃ (12.6 gpg, 12 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Loma Linda 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 Loma Linda water?
12.6 gpg, equal to 12 °dH, 21.5 °fH or 215 mg/L calcium carbonate.
What dishwasher salt setting should I use in Loma Linda?
For 215 mg/L (12 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Loma Linda?
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 CA3610013 (2025-11). Method: own measurement. California SWRCB Division of Drinking Water, EDT lab results, system CA3610013 · Outdated figure? Tell us