Corona, California
City of Corona Utilities 2026 Consumer Confidence Report (2025 data). Hardness prints as labeled source columns — State Project 88, Colorado River 288, a third source column 452, and treated average system water 146 ppm. Chloramines 1.98 RAA. Municipal Code § 13.08.140 is titled water softening restrictions; the operative restriction sentences did not render. Check the district before a brine drain.
- Hardness (State Project)88 (range 82–94)
- Hardness (Colorado River)288 (range 279–298)
- Hardness (third source column)452 (range 290–570)
- Hardness (treated average system)146 (range 7.2–290)
- Chloramines1.98 RAA (range 1.03–2.82)
Best match for Corona
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
- Water utility
- City of Corona Utilities
- Hardness
- Four printed hardness figures, mg/L as CaCO3, 2025. State Project Water 88 average (range 82–94). Colorado River Water 288 (range 279–298). Third source column 452 (range 290–570). Treated average system water 146 (range 7.2–290); FAQ also 146 ppm or 8.5 gpg. Do not blend the source columns. — City of Corona 2026 Consumer Confidence Report (2025 data)
- Disinfectant
- Chloramines 1.98 Max RAA (range 1.03–2.82), MRDL 4 as Cl2. Narrative — ammonium hydroxide plus sodium hypochlorite to chloramines. — City of Corona 2026 Consumer Confidence Report (2025 data)
- Sanitation district
- City of Corona (sewer / Inland Empire Brine Line definitions)
- Brine / salt to the sewer
- Check the sanitation district before installing. Official amlegal TOC lists § 13.08.140 Water softening restrictions. Chapter definitions print an ion-exchange water softener definition and the Inland Empire Brine Line. The § 13.08.140 operative restriction text did not render on the chapter page. Do not invent a ban. Ask Corona Utilities before 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
Corona drinking water is State Project, Colorado River, and other labeled source columns delivered by City of Corona Utilities. Municipal Code § 13.08.140 is titled water softening restrictions; the operative restriction sentences did not render on the opened chapter page. Do not treat the title as a ban we quoted. Ask Corona Utilities before you cut a brine drain. This is not a legal opinion.
The 2026 CCR (2025 data) prints hardness as labeled columns — State Project 88, Colorado River 288, a third source column 452, and treated average system water 146 ppm. Chloramines 1.98 RAA. Kitchen shopping stays the Cloud RO / Waterdrop path already used on other cities if a listing is why you are looking.
Sources
- Consumer Confidence Report 2026 (year 2025) — City of Corona Utilities. Accessed 2026-09-09.
- Municipal Code Chapter 13.08 (TOC / definitions; § 13.08.140 title) — City of Corona (American Legal). Accessed 2026-09-09.
Updated September 9, 2026. A city file is chemistry we can cite plus the sewer rule. No invented detections.