Isleton, California
California American Water — Isleton 2024 Consumer Confidence Report. Total Hardness as CaCO3 20 ppm (20–21) / 1.2 grains, 2023. Chlorine residual 0.78 ppm average, 0.86 ppm result (0.78–0.98), MRDL 4, 2024. No Measure S-style ban turned up — check the sewer agency on the bill.
- Hardness20 ppm as CaCO3 (20–21)
- Chlorine residual0.78 ppm (0.78–0.98)
Best match for Isleton
Whole-house carbon for chlorine
Check the sanitation district before installing a salt system.
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.
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Other options that still fit
Do not buy a softener on this supply
This supply is soft on the published numbers. A salt tank is usually the wrong box unless you are on a well or a different utility. Test the tap before you buy hardness equipment.
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
On the report
- Water utility
- California American Water — Isleton
- Hardness
- Total Hardness as CaCO3 20 ppm (20–21) / 1.2 grains, 2023. — California American Water Isleton 2024 Annual Water Quality Report
- Disinfectant
- Chlorine residual 0.78 ppm average, 0.86 ppm result (0.78–0.98), MRDL 4, 2024. — California American Water Isleton 2024 Annual Water Quality 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
Isleton drinking water on this file is California American Water — Isleton, PWS CA3410012. 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.
The 2024 report prints Total Hardness as CaCO3 20 ppm (20–21) / 1.2 grains, 2023. Chlorine residual 0.78 ppm average, 0.86 ppm result (0.78–0.98), MRDL 4, 2024. Kitchen shopping stays the Cloud RO / Waterdrop path already used on other cities if a listing is why you are looking.
Sources
- 2024 Consumer Confidence Report (PWS CA3410012) — California American Water — Isleton / 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.