Rancho Cucamonga, California
Inland Empire Utilities Agency Ordinance § 2.6 prohibits installing, replacing, or enlarging a self-regenerating water softening appliance that discharges to a community sewer tributary to the IEUA regional sewerage system. Cucamonga Valley Water District is the IEUA contracting agency for Rancho Cucamonga. That is an IEUA / CVWD sewer rule — not a statewide ban. The 2024 report prints total hardness 137.10 ppm (range 89–191).
- Hardness137 ppm (range 89–191)
- Chlorine (free)0.59 ppm (range 0.2–1.39)
- TTHMs30.53 ppb (range 0–110)
- HAA54.39 ppb (range 0–33)
- Chromium-62.56 ppb (range 1.8–5.3)
Best match for Rancho Cucamonga
Portable-exchange softening — not a brine tank
A self-regenerating salt softener that drains to the sewer is prohibited here.
Portable-exchange tanks, if that exception applies at your address. The resin still removes hardness. The salt work happens off site. Do not install a self-regenerating unit to the sewer here.
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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 carbon for chlorine
That is chlorine. A whole-house carbon filter with an NSF/ANSI 42 chlorine claim is the usual match. A softener will not take chlorine out.
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
- Cucamonga Valley Water District
- Hardness
- Total hardness as CaCO3 average 137.10 ppm (range 89–191) on the 2024 secondary table. One printed row, not an imported / groundwater / canyon blend we invented. — Cucamonga Valley Water District 2024 Water Quality Report
- Disinfectant
- Chlorine residual (free) average 0.59 ppm (range 0.2–1.39), MRDL 4. 2024 report. Printed as free chlorine residual. — Cucamonga Valley Water District 2024 Water Quality Report
- Sanitation district
- Cucamonga Valley Water District / Inland Empire Utilities Agency
- Brine / salt to the sewer
- Self-regenerating salt softeners prohibited (district rule). IEUA Ordinance § 2.6 says the installation, replacement, or enlargement of any self-regenerating water softening appliance which discharges into the Community Sewer System that is tributary to the Regional Sewerage System shall not be allowed. The section does not apply to a portable-exchange water softener regenerated off-site at a lawfully regulated location. CVWD’s water-softeners page says softeners that discharge salt or brine to the sewer during a self-regenerating cycle are prohibited, and that portable-exchange bottles regenerated off-site are acceptable. Cucamonga Valley Water District is the IEUA contracting agency for Rancho Cucamonga. That is an IEUA / CVWD sewer rule — not a statewide ban. Ask CVWD or the agency on the sewer bill about the address.
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 2024 table numbersThe same 2024 tables print these as detected averages and ranges, not a three-source blend we invented.Nitrate as N average 3.68 ppm (range 0–6.2), MCL 10. Fluoride 0.25 ppm (0.085–0.44). Sodium 18.62 ppm (7.5–39). TDS 214.69 ppm (8.3–380). Lead 90th percentile 0.00 ppb (0 of 50 above AL 15). Copper 90th 0.13 ppm (0 of 50 above AL 1.3).2024 Water Quality Report — Cucamonga Valley Water District
- PFASThe 2024 tables we opened do not print a PFAS detection row. Open a later CVWD report or EPA’s UCMR 5 Data Finder. This file does not invent a detection.2024 Water Quality Report — Cucamonga Valley Water District
Rancho Cucamonga’s sewer rule is an IEUA regional ordinance implemented with Cucamonga Valley Water District, not a statewide salt-softener ban. IEUA Ordinance § 2.6: the installation, replacement, or enlargement of any self-regenerating water softening appliance which discharges into the Community Sewer System that is tributary to the Regional Sewerage System shall not be allowed. The section does not apply to a portable-exchange water softener regenerated off-site at a lawfully regulated location. CVWD’s water-softeners page says units that discharge salt or brine to the sewer during a self-regenerating cycle are prohibited, and that vendor-exchanged bottles regenerated off-site are acceptable. CVWD is the IEUA contracting agency for Rancho Cucamonga. Ask CVWD or the agency on the sewer bill about the address.
Drinking water in 2024 was about 58 percent groundwater (Cucamonga and Chino basins), 31 percent imported State Water Project water treated at the Lloyd W. Michael plant, and 11 percent local canyon and tunnel water. The 2024 Water Quality Report prints total hardness as CaCO3 137.10 ppm (range 89–191) as one secondary-table row. We do not invent a three-source blend.
Chlorine residual (free) 0.59 ppm (range 0.2–1.39). Chromium-6 2.56 ppb (range 1.8–5.3), MCL 10. TTHMs 30.53 ppb (range 0–110). HAA5 4.39 ppb (range 0–33). A 2025 CVWD booklet is listed in the archive; this file uses the 2024 PDF that opened. Kitchen shopping stays the Cloud RO / Waterdrop path already used on other cities if a listing is why you are looking.
Sources
- Water Softeners (self-regenerating units prohibited) — Cucamonga Valley Water District. Accessed 2026-09-09.
- Ordinance regulating the regional sewerage system, § 2.6 Restrictions on self-regenerating water softening appliances — Inland Empire Utilities Agency. Accessed 2026-09-09.
- 2024 Water Quality Report — Cucamonga Valley 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.