San Jose Water’s 2025 CCR shows hardness from about 5 gpg on some surface water to 32 gpg on groundwater. Chloramine and chlorine may both be present. No SCV-style sewer ban found for the city file.
Check the sanitation district before installing. No San Jose ordinance matching the LACSD Santa Clarita Valley automatic-softener prohibition turned up for this file. Valley Water and the city sewer are not that district. Ask the agency that owns the sewer before you cut a brine drain.
Hardness (as published)
SJW 2025 CCR tables: hardness as CaCO3 from about 82–168 ppm (5–10 gpg) on some surface/purchased water to 155–545 ppm (9–32 gpg) on groundwater columns. Zone-dependent. — San Jose Water 2025 Consumer Confidence Report (main system)
Disinfectant (as published)
Chloramine and chlorine may both be present (SJW dialysis/aquarium notice). Surface water from Montevina and Valley Water already uses chloramines; some wells have been converting. — San Jose Water 2025 CCR; SJW Notification of Treatment Change (Williams Station wells)
What actually fits
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If soap will not lather and you want a salt softener
Salt-based softener: two mineral tanks and a brine tank.
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.
If you are shopping a PFAS listing for the kitchen
Under-sink reverse osmosis: filters, tank, and a second faucet.
A pitcher or under-sink RO whose exact model is listed for PFAS under NSF/ANSI 53 or 58. The RO shop link is Waterdrop. Pitchers stay on a tagged Amazon search. We have not picked a model.
San Jose is a zone file. SJW’s 2025 CCR prints hardness that can look like Sacramento on one column and Phoenix on another.
What SJW publishes
Hardness as CaCO3 on the 2025 tables runs from roughly 82–168 ppm (5–10 gpg) on some surface/purchased water to 155–545 ppm (9–32 gpg) on groundwater. Iron printed ND on some sources and a range that reached 420 ppb on another — that is not a citywide iron-filter prescription.
SJW tells dialysis patients and aquarium owners that chloramine and chlorine may be present. Montevina and Valley Water surface water already use chloramines. Some well stations have been moving from free chlorine to chloramine. Read the notice for your pressure zone.
This file is San Jose Water. Other retailers (Great Oaks, San Jose Municipal Water, Cal Water pockets) are not this CCR.
Salt discharge
No Measure S analogue for City of San Jose turned up. check-district until someone cites an ordinance.
