Water hardness in Maywood
13.1 gpg very hard
Tap water in Maywood is very hard: 13.1 gpg (225 mg/L · 12.6 °dH · 22.4 °fH).
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA1910084 (2026-04) · data checked 2026-10-19
Range across supply zones: 156–269 mg/L.
3 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| gpg | mg/L | ||
|---|---|---|---|
| Maywood Mutual Water Co. #1 | 13.1 | 225 | very hard |
| Maywood Mutual Water Co. #2 | 11.1 | 190 | very hard |
| Maywood Mutual Water Co. #3 | 14.1 | 242 | very hard |
Three mutual water companies serve Maywood in State Water Resources Control Board lab data, all from wells. Company No. 2 reads a median of 190 mg/L as CaCO3 (11.1 gpg), No. 1 reads 224.5 mg/L (13.1 gpg) and No. 3 reads 241.5 mg/L (14.1 gpg). The page shows the median, 224.5 mg/L. All three are very hard, so scale builds quickly on heaters.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 13.1 gpg |
|---|---|
| Utility | Maywood Mutual Water Co. #2 |
How Maywood compares
- Tap water in Maywood is 45 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 448 of 1372 in the United States (1 = hardest); 67 % of these cities have softer water.
- In California it is number 96 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly softer water: Bell Gardens, 4 km away (8.2 gpg).
- Nearest city with clearly harder water: Monterey Park, 8 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 Maywood
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 13 °dH |
| AEG / Electrolux | 3 |
| 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 Maywood water hard or soft?
It is very hard: 225 mg/L as CaCO₃ (13.1 gpg, 12.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Maywood 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 Maywood water?
13.1 gpg, equal to 12.6 °dH, 22.4 °fH or 225 mg/L calcium carbonate.
What dishwasher salt setting should I use in Maywood?
For 225 mg/L (12.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Maywood?
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 CA1910084 (2026-04). Method: own measurement. California SWRCB Division of Drinking Water, EDT lab results, system CA1910084 · Outdated figure? Tell us