Hayward, California
City of Hayward 2025 Annual Water Quality Report (SFPUC Hetch Hetchy supply). Hardness as CaCO3 60 ppm average (range 8.1–112). Chlorine including free chlorine and chloramine 2.9 ppm average. Narrative says chloramination maintains the residual. No Measure S-style residential softener ban ordinance opened — check the sewer agency on the bill.
- Hardness60 ppm (range 8.1–112)
- Chlorine (incl. chloramine)2.9 ppm (range 2.3–3.3)
Best match for Hayward
Salt-based water softener — confirm the district first
Check the sanitation district before installing a salt system.
Ask the agency on the sewer side of the bill before you cut a brine drain. California lets districts restrict self-regenerating units. A “banned in California” blog is not your district.
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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
- Hardness
- Hardness as CaCO3 8.1–112 ppm, average 60 ppm, on the 2025 non-regulated water-quality-parameters table. One printed row, not a second plant we blended. — City of Hayward 2025 Annual Water Quality Report
- Disinfectant
- Chlorine (including free chlorine and chloramine) 2.3–3.3 ppm, average 2.9 ppm, MRDL 4.0. Drinking water disinfectant added for treatment. Narrative says Hetch Hetchy water receives chloramination for maintaining disinfectant residual. 2025 report. — City of Hayward 2025 Annual Water Quality Report
- Brine / salt to the sewer
- Check the sanitation district before installing. No City of Hayward residential self-regenerating softener ban like LACSD Measure S turned up. That is not a statewide ban finding. Ask the sewer agency on the 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 2025 table numbersThe same 2025 report prints these as labeled Hayward / SFPUC results, not a blend we invented.TTHMs average 46 ppb (range 19–64). HAA5 average 31 ppb (range 9.6–44).2025 Annual Water Quality Report — City of Hayward Department of Public Works & Utilities
Hayward drinking water is purchased from the San Francisco Public Utilities Commission Regional Water System (Hetch Hetchy and treated local watershed water). No City of Hayward residential softener ban like LACSD Measure S turned up. Ask the sewer agency on the bill before you cut a brine drain. This is not a legal opinion and not a statewide ban.
The 2025 non-regulated table prints hardness as CaCO3 60 ppm average (range 8.1–112). We do not invent a grains number that table did not print.
Chlorine including free chlorine and chloramine 2.9 ppm average (range 2.3–3.3). The narrative says chloramination maintains the residual. 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 — City of Hayward Department of Public Works & Utilities. Accessed 2026-09-09.
Updated September 9, 2026. A city file is chemistry we can cite plus the sewer rule. No invented detections.