Water hardness in San Leandro
1.6 gpg soft
Tap water in San Leandro is soft: 1.6 gpg (27 mg/L · 1.5 °dH · 2.7 °fH).
Source: EBMUD 2025 Annual Water Quality Report (2025) · data checked 2026-10-23
Range across supply zones: 14–40 mg/L.
San Leandro receives water from EBMUD, which collects Sierra Nevada snowmelt in the Mokelumne watershed and delivers it by aqueduct to the East Bay. Snowmelt carries very few minerals, giving soft water at 27 mg/L CaCO₃ (14–40 mg/L). A softener is not needed.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 1.6 gpg |
|---|---|
| Utility | East Bay Municipal Utility District (EBMUD) |
How San Leandro compares
- Tap water in San Leandro is 83 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 1290 of 1372 in the United States (1 = hardest); 6 % of these cities have softer water.
- In California it is number 314 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly softer water: Walnut Creek, 22 km away (1.1 gpg).
- Nearest city with clearly harder water: Hayward, 12 km away (3.5 gpg).
Ranking of the hardest and softest water in the United States →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in San Leandro
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 2 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
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 San Leandro water hard or soft?
It is soft: 27 mg/L as CaCO₃ (1.6 gpg, 1.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in San Leandro 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 San Leandro water?
1.6 gpg, equal to 1.5 °dH, 2.7 °fH or 27 mg/L calcium carbonate.
What dishwasher salt setting should I use in San Leandro?
For 27 mg/L (1.5 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in San Leandro?
No. With soft water a softener adds nothing.
Source
Source: EBMUD 2025 Annual Water Quality Report (2025). Method: computed from supplier's calcium and magnesium. EBMUD 2025 Annual Water Quality Report · Outdated figure? Tell us