Water hardness in Manhattan Beach
22.9 gpg very hard
Tap water in Manhattan Beach is very hard: 22.9 gpg (392 mg/L · 22 °dH · 39.2 °fH).
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA1910083 (2026-02) · data checked 2026-10-19
Range across supply zones: 331–430 mg/L.
The Manhattan Beach figure comes from State Water Resources Control Board lab results for the city water department. It rests on 4 results from 2 wells, taken between 2023 and 2026: a median of 392 mg/L as CaCO3 (22.9 gpg), with a range of 331 to 430 mg/L. The sample is small. On this data the water is very hard, and scale builds very fast.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 22.9 gpg |
|---|---|
| Utility | Manhattan Beach-City, Water Dept. |
How Manhattan Beach compares
- Tap water in Manhattan Beach is 153 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 64 of 1372 in the United States (1 = hardest); 95 % of these cities have softer water.
- In California it is number 16 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly softer water: Hawthorne, 7 km away (12.9 gpg).
- Nearest city with clearly harder water: Redondo Beach, 6 km away (29.3 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 Manhattan Beach
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 22 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| Hoover | S3 |
| LG | H4 |
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 Manhattan Beach water hard or soft?
It is very hard: 392 mg/L as CaCO₃ (22.9 gpg, 22 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Manhattan Beach 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 Manhattan Beach water?
22.9 gpg, equal to 22 °dH, 39.2 °fH or 392 mg/L calcium carbonate.
What dishwasher salt setting should I use in Manhattan Beach?
For 392 mg/L (22 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Manhattan Beach?
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 CA1910083 (2026-02). Method: own measurement. California SWRCB Division of Drinking Water, EDT lab results, system CA1910083 · Outdated figure? Tell us