Water hardness in Placentia
11 gpg very hard
Tap water in Placentia is very hard: 11 gpg (188 mg/L · 10.5 °dH · 18.8 °fH).
Source: Golden State Water Placentia-Yorba Linda Water System Your Water Quality Report 2025 (2025) · data checked 2026-10-20
Range across supply zones: 67–299 mg/L.
Placentia is served by Golden State Water's Placentia-Yorba Linda system, which also serves Yorba Linda, so this is a system-level figure and not a Placentia-only measurement. The median is 188 mg/L (11.0 gpg), with a range of 67.1 to 299 mg/L (3.9 to 17.5 gpg). That spread points to more than one supply feeding the system, so your tap may sit well above or below the median. Check the utility's current report for your address before buying a softener.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 11 gpg |
|---|---|
| Utility | Golden State Water Company (Placentia-Yorba Linda Water System) |
How Placentia compares
- Tap water in Placentia is 21 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 572 of 1372 in the United States (1 = hardest); 58 % of these cities have softer water.
- In California it is number 137 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly softer water: La Palma, 16 km away (8.5 gpg).
- Nearest city with clearly harder water: Yorba Linda, 9 km away (15 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 Placentia
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 11 °dH |
| AEG / Electrolux | 2 |
| 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 Placentia water hard or soft?
It is very hard: 188 mg/L as CaCO₃ (11 gpg, 10.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Placentia 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 Placentia water?
11 gpg, equal to 10.5 °dH, 18.8 °fH or 188 mg/L calcium carbonate.
What dishwasher salt setting should I use in Placentia?
For 188 mg/L (10.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Placentia?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Golden State Water Placentia-Yorba Linda Water System Your Water Quality Report 2025 (2025). Method: figure published by the water supplier. Golden State Water Placentia-Yorba Linda Water System Your Water Quality Report 2025 · Outdated figure? Tell us