Antioch, California
City of Antioch tables in the Contra Costa Water District 2024 Annual Water Quality Report. Hardness 76 mg/L (range 49–145). Chloramines 2.6 mg/L highest quarterly RAA. No Measure S-style residential softener ban turned up — check the sewer agency on the bill.
- Hardness76 mg/L (range 49–145)
- Chloramines as Cl22.6 mg/L (range 0.1–4.0)
- Nitrate as N0.5 mg/L (range ND–0.9)
Best match for Antioch
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.
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.
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
- Water utility
- City of Antioch
- Hardness
- CITY OF ANTIOCH general parameters, 2024. Hardness 76 mg/L average (range 49–145). One city table, not blended with Martinez, Pittsburg, or CCWD plant columns on the same booklet. — Contra Costa Water District 2024 Annual Water Quality Report (City of Antioch tables)
- Disinfectant
- Chloramines as Cl2 2.6 mg/L highest quarterly RAA (range 0.1–4.0), MRDL 4.0. Printed as chloramines. — Contra Costa Water District 2024 Annual Water Quality Report (City of Antioch tables)
- Brine / salt to the sewer
- Check the sanitation district before installing. No Measure S-style residential self-regenerating install 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
- 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
Antioch drinking water tables sit in the 2024 Contra Costa Water District regional booklet. No Measure S-style residential self-regenerating install ban turned up. Ask Antioch Public Works or the agency on the sewer bill before you cut a brine drain. This is not a legal opinion.
The City of Antioch table prints hardness 76 mg/L (range 49–145). Chloramines 2.6 mg/L highest quarterly RAA (range 0.1–4.0). Those are the Antioch columns, not a blend with Pittsburg or CCWD plant tables. Kitchen shopping stays the Cloud RO / Waterdrop path already used on other cities if a listing is why you are looking.
Sources
- 2024 Annual Water Quality Report (City of Antioch tables) — Contra Costa Water District / City of Antioch. Accessed 2026-09-09.
Updated September 9, 2026. A city file is chemistry we can cite plus the sewer rule. No invented detections.