Oakland, California
East Bay Municipal Utility District 2025 Annual Water Quality Report. Mokelumne River water treated at labeled plants. Hardness stays plant columns — Walnut Creek / Lafayette / Orinda about 1–2 grains, Sobrante 4–6, Upper San Leandro 8–9. Chloramine 0.7–0.8 ppm. No Measure S-style residential softener ban turned up.
- Hardness (Orinda)1–2 gpg (14–40 ppm)
- Hardness (Upper San Leandro)8–9 gpg (140–160 ppm)
- Chloramine0.7–0.8 ppm
Best match for Oakland
Salt-based water softener
No district prohibition on a brine drain turned up in the current file.
A salt-based softener is the thing that actually removes hardness. Size it from your grains and how much water you use, not bathroom count. It needs a drain.
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Other options that still fit
Salt-free conditioner
A salt-free conditioner changes how scale sticks. It does not soften. Soap and spots stay closer to untreated. No brine line.
Whole-house catalytic carbon for chloramine
Catalytic carbon with a chloramine claim (NSF/ANSI 42 for chloramine). Regular chlorine carbon is the wrong box.
Under-sink reverse osmosis
The under-sink RO we actually run is Cloud RO — NSF/ANSI 58, kitchen tap, not a whole-house tank. Check the exact listing if PFAS is why you are shopping. Shop Amazon first for under-sink RO, or buy Cloud direct. Waterdrop is a tankless option if you want that path. A certifier-listed pitcher is the cheap first step. Nobody is paying for a medical claim.
Shop under-sink reverse osmosisBuy Cloud RO directShop Waterdrop reverse osmosisShop PFAS-listed pitchers
Test the tap first
A homeowner kit is a start. It is not a state-certified lab. Use a certified lab when the decision is expensive.
On the report
- Water utility
- East Bay Municipal Utility District
- Hardness
- Walnut Creek 1 grain (15–21 ppm). Lafayette 1–2 grains (14–27 ppm). Orinda 1–2 grains (14–40 ppm). Sobrante 4–6 grains (64–98 ppm). Upper San Leandro 8–9 grains (140–160 ppm). Those are labeled plant columns, not a blended citywide number. San Pablo plant was out of service in 2025. 2025 Annual Water Quality Report. — East Bay Municipal Utility District 2025 Annual Water Quality Report
- Disinfectant
- Chloramine as chlorine 0.7–0.8 ppm on the Walnut Creek, Lafayette, and Orinda columns. MRDL 4. 2025 report. — East Bay Municipal Utility District 2025 Annual Water Quality Report
- Brine / salt to the sewer
- No district prohibition found in current research. No EBMUD or City of Oakland residential softener ban like LACSD Measure S turned up. Ask EBMUD or the agency on the sewer bill before you cut a brine drain.
Also around here
Extra context besides the utility report and the chart above — geology, an unregulated table, or a published study. Not a second set of printed tap numbers.
- MicroplasticsWHO’s 2019 review examined studies that found microplastic particles in treated tap and bottled water in many places. That is a published-occurrence finding, not a number from this city’s water-quality report, and we do not invent a particles-per-liter count for the tap.Microplastics in drinking-water — World Health Organization
- Other plant columnsThe same 2025 table prints these as labeled plant results. EBMUD sewer is not every East Bay address.Sobrante hardness 4–6 gpg (64–98 ppm). Walnut Creek 1 gpg (15–21 ppm). Lafayette 1–2 gpg (14–27 ppm).2025 Annual Water Quality Report — East Bay Municipal Utility District
Oakland drinking water is East Bay Municipal Utility District Mokelumne River water treated at labeled plants. No EBMUD or City of Oakland residential softener ban like LACSD Measure S turned up. Ask EBMUD or the agency on the sewer bill before you cut a brine drain. This is not a legal opinion. EBMUD also serves other East Bay cities; this file is the Oakland route.
The 2025 Annual Water Quality Report prints hardness as plant columns — Walnut Creek 1 grain (15–21 ppm), Lafayette 1–2 grains (14–27 ppm), Orinda 1–2 grains (14–40 ppm), Sobrante 4–6 grains (64–98 ppm), Upper San Leandro 8–9 grains (140–160 ppm). San Pablo was out of service in 2025. We do not invent a citywide blend.
Chloramine as chlorine 0.7–0.8 ppm on the Walnut Creek, Lafayette, and Orinda columns. Kitchen shopping stays the Cloud RO / Waterdrop path already used on other cities if a listing is why you are looking.
Sources
- 2025 Annual Water Quality Report — East Bay Municipal Utility District. Accessed 2026-09-09.
Updated September 9, 2026. A city file is chemistry we can cite plus the sewer rule. No invented detections.