Mammoth Lakes, California
Mammoth Community Water District 2024 Consumer Confidence Report. Hardness 14 / 360 / 14 / 360 on a labeled hardness row in the 2024 tables. The row is not labeled as CaCO3 in the extracted text, so this file does not assign a hardness class from it. Chlorine residual 0.89 / 0.48 / 1.33 on the labeled 2024 columns, MRDL 4. No Measure S-style ban turned up — check the sewer agency on the bill.
- Hardness (printed row)14 / 360 / 14 / 360
- Chlorine residual0.89 / 0.48 / 1.33
Best match for Mammoth Lakes
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
Confirm hardness on the current CCR before buying
Open the current CCR for grains. This file does not invent a number from a ranking site. A salt softener needs a drain if it is legal at the address.
Shop salt-based softenersShop salt-free conditionersShop water test kits
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
- Mammoth Community Water District
- Hardness
- Hardness 14 / 360 / 14 / 360 on a labeled hardness row in the 2024 tables. The row is not labeled as CaCO3 in the extracted text, so this file does not assign a hardness class from it. — Mammoth Community Water District 2024 Consumer Confidence Report
- Disinfectant
- Chlorine residual 0.89 / 0.48 / 1.33 on the labeled 2024 columns, MRDL 4. — Mammoth Community Water District 2024 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
Mammoth Lakes drinking water on this file is Mammoth Community Water District, PWS CA2610001. 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 Hardness 14 / 360 / 14 / 360 on a labeled hardness row in the 2024 tables. The row is not labeled as CaCO3 in the extracted text, so this file does not assign a hardness class from it. Chlorine residual 0.89 / 0.48 / 1.33 on the labeled 2024 columns, MRDL 4. 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 CA2610001) — Mammoth Community Water District / 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.