Water hardness in Oakland
1.6 gpg soft
Tap water in Oakland 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.
EBMUD supplies Oakland with Sierra Nevada snowmelt carried down the Mokelumne River to Pardee Reservoir and by aqueduct to the East Bay. Snowmelt is low in minerals, giving a soft 27 mg/L CaCO₃ (14–40 mg/L through the year). Scale is minimal, and 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 Oakland compares
- Tap water in Oakland 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, 21 km away (1.1 gpg).
- Nearest city with clearly harder water: San Francisco, 13 km away (3.6 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 Oakland
| 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 Oakland 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 Oakland 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 Oakland 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 Oakland?
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 Oakland?
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