Water hardness in Chino Hills
9.9 gpg hard
Tap water in Chino Hills is hard: 9.9 gpg (170 mg/L · 9.5 °dH · 17 °fH).
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA3610036 (2026-05) · data checked 2026-10-19
Range across supply zones: 13–625 mg/L.
The Chino Hills figure comes from State Water Resources Control Board lab results for the City of Chino Hills system. It rests on 6 well results from 2022 to 2026: a median of 170 mg/L as CaCO3 (9.9 gpg), within a very wide range of 13 to 625 mg/L. The top value is a single result, and the median is only a rough guide. The water is hard on median.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 9.9 gpg |
|---|---|
| Utility | Chino Hills, City Of |
How Chino Hills compares
- Tap water in Chino Hills is 10 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 625 of 1372 in the United States (1 = hardest); 54 % of these cities have softer water.
- In California it is number 156 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly softer water: Rancho Cucamonga, 25 km away (7.3 gpg).
- Nearest city with clearly harder water: Yorba Linda, 7 km away (15 gpg).
Ranking of the hardest and softest water in the United States →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Chino Hills
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 10 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| 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 Chino Hills water hard or soft?
It is hard: 170 mg/L as CaCO₃ (9.9 gpg, 9.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Chino Hills 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 Chino Hills water?
9.9 gpg, equal to 9.5 °dH, 17 °fH or 170 mg/L calcium carbonate.
What dishwasher salt setting should I use in Chino Hills?
For 170 mg/L (9.5 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Chino Hills?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA3610036 (2026-05). Method: own measurement. California SWRCB Division of Drinking Water, EDT lab results, system CA3610036 · Outdated figure? Tell us