TapMatch

Fremont, California

Alameda County Water District 2025 Water Quality Report. Hardness prints as four labeled columns — treated surface 96 ppm, purchased San Francisco 40 ppm, blended 138 ppm, desalinated 62 ppm. Chloramines 2.1 ppm annual average. No Measure S-style residential softener ban ordinance opened — check the sewer agency on the bill.

Cited chemistry for FremontA chart of numbers printed on the utility report, each labeled with its unit. Missing numbers are left off.Hardness (treated surface)96 ppm (range 77–120)Hardness (purchased SF)40 ppm (range 9–120)Hardness (blended)138 ppm (range 120–160)Hardness (desalinated)62 ppm (range 59–65)Chloramines2.1 ppm avg (range ND–3.4)WQR
Cited numbers from the utility report. Length follows the printed value against a labeled scale — not a health ranking. If the report has no number, it is not on the chart.
  1. Hardness (treated surface)96 ppm (range 77–120)
  2. Hardness (purchased SF)40 ppm (range 9–120)
  3. Hardness (blended)138 ppm (range 120–160)
  4. Hardness (desalinated)62 ppm (range 59–65)
  5. Chloramines2.1 ppm avg (range ND–3.4)

Best match for Fremont

Salt-based water softener — confirm the district first

Check the sanitation district before installing a salt system.

Two tall mineral tanks and a black brine tank of a salt-based water softener, plumbed with copper pipe in a garage.
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.

Shop salt-based softeners

Some links are affiliate links. If you buy through one, we may earn a commission. That does not change the match, and it is not a medical claim.

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.

    Shop salt-free conditioners

  • Whole-house catalytic carbon for chloramine

    Catalytic carbon with a chloramine claim (NSF/ANSI 42 for chloramine). Regular chlorine carbon is the wrong box.

    Shop catalytic carbon for chloramine

  • 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.

    Shop water test kits

On the report

Water utility
Alameda County Water District
Hardness
Treated surface water 77–120 ppm as CaCO3, average 96. Purchased San Francisco water 9–120 ppm, average 40. Blended water 120–160 ppm, average 138. Desalinated water 59–65 ppm, average 62. Footnote says divide ppm by 17.1 for grains per gallon. Those are four labeled 2025 columns, not a blended citywide number. 2025 Water Quality Report. — Alameda County Water District 2025 Water Quality Report
Disinfectant
Disinfectant residual as Cl2 annual average 2.1 ppm (range of individual detections ND–3.4). MRDL 4.0. Footnote says the distribution residual is combined chlorine (chloramines), reported as total combined chlorine. 2025 report. — Alameda County Water District 2025 Water Quality Report
Brine / salt to the sewer
Check the sanitation district before installing. No ACWD or City of Fremont residential self-regenerating softener ban like LACSD Measure S turned up. That is not a statewide ban finding. ACWD also serves Newark and Union City. 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 source or distribution results, not a blend we invented.TTHMs highest LRAA 41.8 ppb (range 3.5–84). HAA5 highest LRAA 32.0 ppb (range 2.6–43).2025 Water Quality Report — Alameda County Water District

Fremont drinking water is Alameda County Water District treated surface water, purchased San Francisco water, blended water, and desalinated water. ACWD also serves Newark and Union City; this file is the Fremont route. No ACWD 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 Water Quality Report prints hardness as four labeled columns — treated surface 96 ppm (range 77–120), purchased San Francisco 40 ppm (range 9–120), blended 138 ppm (range 120–160), and desalinated 62 ppm (range 59–65). The report says to divide ppm by 17.1 for grains. We do not invent a citywide blend.

Chloramines 2.1 ppm annual average (range ND–3.4). Kitchen shopping stays the Cloud RO / Waterdrop path already used on other cities if a listing is why you are looking.

Sources

  1. 2025 Water Quality Report — Alameda County Water District. Accessed 2026-09-09.

Updated September 9, 2026. A city file is chemistry we can cite plus the sewer rule. No invented detections.