Water hardness in Walnut Creek
1.1 gpg soft
Tap water in Walnut Creek is soft: 1.1 gpg (18 mg/L · 1 °dH · 1.8 °fH).
Source: EBMUD First Half 2025 Data Update (2025-06) · data checked 2026-10-20
Range across supply zones: 15–21 mg/L.
Walnut Creek is supplied by East Bay Municipal Utility District, which reported a computed 18 mg/L in the first half of 2025, with a range of 15 to 21 mg/L. Soft water means little scale, so detergent and soap can be used at lower doses.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 1.1 gpg |
|---|---|
| Utility | East Bay Municipal Utility District (EBMUD) |
How Walnut Creek compares
- Tap water in Walnut Creek is 88 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 1335 of 1372 in the United States (1 = hardest); 3 % of these cities have softer water.
- In California it is number 327 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly harder water: Concord, 9 km away (4.3 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 Walnut Creek
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 1 °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 Walnut Creek water hard or soft?
It is soft: 18 mg/L as CaCO₃ (1.1 gpg, 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 Walnut Creek 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 Walnut Creek water?
1.1 gpg, equal to 1 °dH, 1.8 °fH or 18 mg/L calcium carbonate.
What dishwasher salt setting should I use in Walnut Creek?
For 18 mg/L (1 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Walnut Creek?
No. With soft water a softener adds nothing.
Source
Source: EBMUD First Half 2025 Data Update (2025-06). Method: computed from supplier's calcium and magnesium. EBMUD First Half 2025 Data Update · Outdated figure? Tell us