Water hardness in Murrieta
15.8 gpg very hard
Tap water in Murrieta is very hard: 15.8 gpg (270 mg/L · 15.1 °dH · 27 °fH).
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA3310036 (2026-01) · data checked 2026-10-19
Range across supply zones: 229–283 mg/L.
The figure is for the Murrieta Division of Western Municipal Water District, from State Water Resources Control Board lab results for finished water. The median of 8 results from 2025 to 2026 is 270 mg/L as CaCO3 (15.8 gpg), with a range of 229 to 283 mg/L. The division serves only part of Murrieta, and other suppliers cover the rest. Water at this level is very hard and scales heaters quickly.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 15.8 gpg |
|---|---|
| Utility | Western Mwd - Murrieta Division |
How Murrieta compares
- Tap water in Murrieta is 74 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 326 of 1372 in the United States (1 = hardest); 76 % of these cities have softer water.
- In California it is number 57 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly softer water: Temecula, 10 km away (11.1 gpg).
- Nearest city with clearly harder water: Monterey Park, 102 km away (22.2 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 Murrieta
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 15 °dH |
| AEG / Electrolux | 4 |
| 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 Murrieta water hard or soft?
It is very hard: 270 mg/L as CaCO₃ (15.8 gpg, 15.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Murrieta 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 Murrieta water?
15.8 gpg, equal to 15.1 °dH, 27 °fH or 270 mg/L calcium carbonate.
What dishwasher salt setting should I use in Murrieta?
For 270 mg/L (15.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Murrieta?
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 CA3310036 (2026-01). Method: own measurement. California SWRCB Division of Drinking Water, EDT lab results, system CA3310036 · Outdated figure? Tell us