Union City, California
Alameda County Water District (Union City addresses on this table) 2025 Consumer Confidence Report (Water Boards). Union City drinking water on this opened file is the PWS CA0110006 table (ACWD / SFPUC regional numbers). Hardness as CaCO3 **57 ppm** (8.4–106). Chlorine including chloramine **2.9 ppm** (2.2–3.3). Check the bill. No Measure S-style residential softener ban turned up — check the sewer agency on the bill.
- Hardness57 ppm (8.4–106)
- Chlorine / chloramine2.9 ppm (2.2–3.3)
Best match for Union City
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 57 ppm (range 8.4–106), 2025. SFPUC regional-style table on the opened Water Boards file. — Alameda County Water District (Union City addresses on this table) 2025 Consumer Confidence Report
- Disinfectant
- Chlorine (including free chlorine and chloramine) 2.9 ppm (range 2.2–3.3), MRDL 4.0, 2025. — Alameda County Water District (Union City addresses on this table) 2025 Consumer Confidence Report
- Brine / salt to the sewer
- Check the sanitation district before installing. No city or sanitation-district residential self-regenerating softener ban like LACSD Measure S or IEUA Ordinance § 2.6 turned up on the pages we opened. That is not a statewide ban finding. Ask 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
- 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. This file does not invent a detection.Fifth Unregulated Contaminant Monitoring Rule — U.S. Environmental Protection Agency
Union City drinking water on this file is Alameda County Water District (Union City addresses on this table), PWS CA0110006. No city or sanitation-district residential self-regenerating softener ban like LACSD Measure S or IEUA Ordinance § 2.6 turned up on the pages we opened. That is not a statewide ban finding. Ask the agency on the sewer bill before you cut a brine drain. This is not a legal opinion.
Union City drinking water on this opened file is the PWS CA0110006 table (ACWD / SFPUC regional numbers). Hardness as CaCO3 57 ppm (8.4–106). Chlorine including chloramine 2.9 ppm (2.2–3.3). Check the bill. Kitchen shopping stays the Cloud RO / Waterdrop path already used on other cities if a listing is why you are looking.
Sources
- 2025 Consumer Confidence Report (PWS CA0110006) — Alameda County Water District (Union City addresses on this table) / State Water Resources Control Board. Accessed 2026-09-11.
Updated September 11, 2026. A city file is chemistry we can cite plus the sewer rule. No invented detections.