San Jose, California
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.
California · Salt-softener legality
- Hardness82–545 ppm by source
- Chloramine / chlorineboth may be present
What to do in San Jose
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.
Hard water. Confirm the sewer district before you cut a brine drain.
Amazon lists shipping and returns on that product page. We do not warehouse the equipment.
Also for the kitchen
Under-sink reverse osmosis
Cloud RO is an under-sink reverse osmosis system — NSF/ANSI 58, kitchen tap, not a whole-house tank. The primary button is a tagged Amazon under-sink RO listing. Cloud buy-direct and Waterdrop sit under that. Check the exact listing if PFAS is why you are shopping. A certifier-listed pitcher is the cheap first step.
Buy Cloud RO directShop Waterdrop reverse osmosisShop PFAS-listed pitchers
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As an Amazon Associate we earn from qualifying purchases.
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.
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.
Softener vs carbon vs under-sink RO
A sketch for San Jose, tied to the best match above. Not a quote.
| Box | What it does | Ballpark (estimate) |
|---|---|---|
| Salt-based softenerBest match | Removes hardness. Needs a drain. Illegal in some sewer districts. No ban is cited. Ask the agency on the sewer bill before you cut a drain. | About $800–$2,500 for a common residential unit (equipment). Installed jobs run higher. |
| Whole-house carbon | Chlorine or chloramine taste — match the listing. Does not soften. | About $400–$1,800 for a typical tank-and-head kit (equipment). |
| Under-sink reverse osmosisBest match | Kitchen tap. Check NSF/ANSI 58 if PFAS or nitrate is why you are shopping. | About $200–$600 on Amazon search; named under-sink units vary. |
These are ballpark equipment ranges, not installed quotes and not what a dealer will write on a kitchen-table sheet. Prices move. Confirm the sewer rule before you price a brine tank.
On the report
- Water utility
- San Jose Water (SJW)
- Hardness
- 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
- 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)
- Sanitation district
- City of San Jose / regional wastewater (confirm on the sewer bill)
- Brine / salt to the sewer
- Check the sanitation district before installing. No San Jose ordinance matching the LACSD Santa Clarita Valley automatic-softener prohibition turned up for the utility's report. Valley Water and the city sewer are not that district. Ask the agency that owns the sewer before you cut a brine drain.
How to get your water tested
The report on this page is for the public water system. It is not a test of the faucet in one house. Pipes inside a house can change the water.
For a test of your own tap, use a laboratory on the California State Water Resources Control Board list of certified drinking-water labs.
If your water comes from a private well, test it once a year. A city water report does not cover a private well.
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
- PFASEPA’s Fifth Unregulated Contaminant Monitoring Rule required community systems this size to test 29 PFAS and lithium in 2023–2025. Open the UCMR 5 Data Finder for this PWS. We do not invent a detection.Fifth Unregulated Contaminant Monitoring Rule — U.S. Environmental Protection Agency
Questions we can answer from the report
How hard is San Jose tap water?
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. Source: San Jose Water 2025 Consumer Confidence Report (main system).
Does San Jose use chlorine or chloramine?
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. Source: San Jose Water 2025 CCR; SJW Notification of Treatment Change (Williams Station wells).
Is a salt-based water softener legal in San Jose?
Check the sanitation district — no cited ban found. No San Jose ordinance matching the LACSD Santa Clarita Valley automatic-softener prohibition turned up for the utility's report. Valley Water and the city sewer are not that district. Ask the agency that owns the sewer before you cut a brine drain. Check the sanitation district before installing a salt system. This is not a legal opinion.
What should I do about San Jose tap water?
Salt-based water softener — confirm the district first. 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 the job is drinking water at the kitchen, under-sink reverse osmosis is the usual path. Cloud RO is the preferred Amazon listing on this site (tag tapmatch-20). We do not claim we use it.
Sources
- 2025 Consumer Confidence Report — San Jose Water. Accessed 2026-08-31.
Updated August 31, 2026. Numbers here are what the utility's report or the state record printed, plus the sewer rule. No invented detections.