Water hardness in Yorba Linda
15 gpg very hard
Tap water in Yorba Linda is very hard: 15 gpg (258 mg/L · 14.4 °dH · 25.8 °fH).
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA3010035 (2026-03) · data checked 2026-10-19
Range across supply zones: 97–389 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| gpg | mg/L | ||
|---|---|---|---|
| Golden State Wc - Placentia/Yorba Linda | 10.2 | 175 | hard |
| Yorba Linda Water District | 19.9 | 340 | very hard |
Two systems serve Yorba Linda in State Water Resources Control Board lab data. Golden State Water reads a median of 175 mg/L as CaCO3 (10.2 gpg) from 22 well results, and Yorba Linda Water District reads 340 mg/L (19.9 gpg) from 40 well results. The page shows the median of the two. Your hardness depends on which provider serves your street, and the second is well above the first.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 15 gpg |
|---|---|
| Utility | Golden State Wc - Placentia/Yorba Linda |
How Yorba Linda compares
- Tap water in Yorba Linda is 66 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 360 of 1372 in the United States (1 = hardest); 74 % of these cities have softer water.
- In California it is number 68 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly softer water: Chino Hills, 7 km away (9.9 gpg).
- Nearest city with clearly harder water: Anaheim, 4 km away (19.5 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 Yorba Linda
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 14 °dH |
| AEG / Electrolux | 3 |
| 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 Yorba Linda water hard or soft?
It is very hard: 258 mg/L as CaCO₃ (15 gpg, 14.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Yorba 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 Yorba Linda water?
15 gpg, equal to 14.4 °dH, 25.8 °fH or 258 mg/L calcium carbonate.
What dishwasher salt setting should I use in Yorba Linda?
For 258 mg/L (14.4 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Yorba 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 CA3010035 (2026-03). Method: own measurement. California SWRCB Division of Drinking Water, EDT lab results, system CA3010035 · Outdated figure? Tell us