Top lists / Water for humidifiers
Best water for humidifiers
Distilled water, as the EPA and CPSC advise. These have the lowest published dissolved minerals.
Criterion: Still water with published TDS of 10 mg/L or less (including “not detected”), from the brand’s own verified analysis. Lowest first; ties are ordered by Waterphile Score. These are distilled and purified waters; the EPA notes distillation removes the most minerals.
Follow your humidifier maker’s instructions first; some ask for tap water or their own filters. Empty, clean and dry the tank often whatever water you use.
Why it matters
Ultrasonic and cool-mist humidifiers spray the minerals in tap water into the air as “white dust”, and minerals build up as scale where bacteria and mould can grow. The EPA and CPSC advise distilled or demineralised water (or the maker’s demineralisation cartridge), changing the water daily, cleaning every third day and keeping humidity at 30–50%. Steam (warm-mist) units release far fewer minerals.
| # | Water | TDS | Calcium | Compare |
|---|---|---|---|---|
| 1 | NiagaraUSA | Not detectedTDS | Not detected | Compare |
| 2 | Polar (purified water)USA | Not detectedTDS | 0.1 mg/L | Compare |
| 3 | up&up Distilled WaterUSA | Not detectedTDS | Not detected | Compare |
| 4 | Menehune WaterUSA (Hawaii) | Not detectedTDS | Not detected | Compare |
| 5 | Kroger Purified Drinking WaterUSA | Not detectedTDS | — | Compare |
| 6 | Mayday Emergency Drinking WaterUSA | Not detectedTDS | Not detected | Compare |
| 7 | Market Pantry Purified Water (Target)USA | Not detectedTDS | Not detected | Compare |
| 8 | Boxed Water Is BetterUSA | Not detectedTDS | Not detected | Compare |
| 9 | PentaUSA | Not detectedTDS | — | Compare |
| 10 | Good & Gather Alkaline WaterUSA | Not detectedTDS | 2.2 mg/L | Compare |
| 11 | AquafinaUSA | Not detectedTDS | — | Compare |
| 12 | Le BleuUSA | <10 mg/LTDS | <0.05 mg/L | Compare |
| 13 | RasuwaNepal | 10 mg/LTDS | 2.5 mg/L | Compare |
USA
NepalSources (13)
- Niagara: Niagara Bottling Water Quality Report 2026, Purified Water column · checked 2026-10-25
- Polar (purified water): Polar Beverages annual analysis, Purified Finished Product, Eurofins Eaton Analytical job 380-178780-1, report date 11/06/2025 · checked 2026-10-25
- up&up Distilled Water: Target – Water Quality Analysis 2025 (official, 1 Gal up&up Distilled Water) · checked 2026-11-03
- Menehune Water: Menehune Water quarterly report, Q1 2018, purified finished product (hosted by Consumer Reports) · checked 2026-10-26
- Kroger Purified Drinking Water: Kroger bottled water annual collection test report 2016 (hosted by Consumer Reports) · checked 2026-10-26
- Mayday Emergency Drinking Water: Mayday Industries 2018 Bottled Water Quality Report (hosted by Consumer Reports) · checked 2026-10-26
- Market Pantry Purified Water (Target): Market Pantry (Target) water analysis report 2018, purified water (hosted by Consumer Reports) · checked 2026-10-26
- Boxed Water Is Better: Boxed Water Is Better water quality report, Q4 2018 (hosted by Consumer Reports) · checked 2026-10-25
- Penta: Penta Water Quality Report 2019 (pentawater.com) · checked 2026-10-25
- Good & Gather Alkaline Water: Target – Water Quality Analysis 2025 (official, 1 Gallon Good & Gather Alkaline Water) · checked 2026-11-03
- Aquafina: Aquafina 2026 CA Water Quality Report (pepsico.com) · checked 2026-10-25
- Le Bleu: Le Bleu – Water Purity Test, EMSL Analytical, Ultra Pure, 14/12/2022 (official) · checked 2026-10-29
- Rasuwa: Rasuwa official site, product text (no analysis date given) · checked 2026-10-26
FAQ
Can I use tap water in a humidifier?
You can, but the EPA says ultrasonic and cool-mist humidifiers spray tap-water minerals into the air as white dust and build scale where microbes grow. It recommends distilled water or a demineralisation cartridge.
Is purified water as good as distilled for a humidifier?
Often close. The EPA says distillation removes the most minerals; reverse osmosis and deionisation remove most but are generally less effective. Check the TDS on the label.
Values as published by each brand, per litre. Not medical advice.