Water hardness / Oakland
Is Oakland water hard? No.
No. Oakland tap water measures 16 to 64 mg/L of hardness as calcium carbonate, which is soft to moderately hard on the USGS scale. It is the range East Bay Municipal Utility District publishes in its EBMUD water quality data, which gives no average. EBMUD serves Oakland and reports treatment-plant readings; water at a specific address can vary with source and distribution.
Where Oakland sits on the scale.
Oakland's published range is 16 to 64 mg/L. On the USGS scale, that is soft to moderately hard.
0–60Moderate
61–120Hard
121–180Very hard
180+
What it means for curly hair
Soft water leaves little mineral residue, so water is unlikely to be the reason your curls feel dull or stiff. Look first at product buildup, porosity and the weather.
Hard water is a plausible factor, not a proven cause of breakage. Sudden shedding, itching, flaking or scalp pain needs a dermatologist, not a chelating routine.
Change less. Learn more.
What to try
No chelating routine is needed for the water. A regular clarifying wash handles product buildup.
What to avoid
Do not clarify or chelate every wash: it strips more than minerals.
Do not blame the water for sudden shedding, itching, flaking or scalp pain. That is a reason to see a dermatologist.
Every number keeps its source.
Current hardness readings displayed by EBMUD: 16, 18 and 64 mg/L across listed treatment plants. The page states that sample results are the most recent available.. Classified with the US Geological Survey bands (soft 0 to 60, moderately hard 61 to 120, hard 121 to 180, very hard above 180 mg/L). Period: October 2026. Checked against the source on 2026-10-20. Rizzado did not measure this water.
The East Bay Municipal Utility District report is public: EBMUD water quality data. Hardness can vary by area and season, and private wells or buildings with their own treatment can differ. If you want your exact value, ask the utility for your address.
Sources
- EBMUD water quality data
- Evans, A. O., Marsh, J. M., Wickett, R. R. (2011). The uptake of water hardness metals by human hair. Journal of Cosmetic Science, 62(4), 383-391.
- Luqman, M. W. et al. (2016). Effect of topical application of hard water in weakening of hair in men. Journal of the Pakistan Medical Association, 66(9), 1132-1136.
- Luqman, M. W. et al. (2018). To evaluate and compare changes in baseline strength of hairs after treating them with deionized water and hard water. International Journal of Trichology, 10(3), 113-117.
- Srinivasan, G., Srinivas, C. R., Mathew, A. C., Duraiswami, D. (2013). Effects of hard water on hair. International Journal of Trichology.
- U.S. Geological Survey. Hardness of water.
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RIZZADO
Your water is one part of the picture.
Rizzado uses your city's water hardness, when there is a primary source, to adjust your routine. If your city is not here, it treats the value as unknown.
