INCI Name
Aqua
Functions
1 Roles
Sustainability
10/10
Category
general
What It Does
Aqua (deionized water) is purified water that has had its mineral ions removed through ion exchange processes, making it the most common cosmetic ingredient and universal solvent. Unlike tap water, deionized water is free from minerals, chlorine, and other impurities that could interfere with formulation stability, product efficacy, or cause unwanted reactions with active ingredients. Formulators choose deionized water as their base because it provides a clean, neutral medium that allows other ingredients to perform optimally without introducing contaminants that could affect color, odor, or preservation.
Technical Properties
pH Range
5.0-8.0
Optimal working range
Ionic Charge
nonionic
Molecular charge type
Viscosity Effect
neutral
Impact on formula thickness
Ingredient Compatibility
Works Well With
Avoid Combining
Sustainability Profile
Sustainability Score
Biodegradability
readily biodegradable
Source
mineral
Feedstock
purified water
Related Ingredients
Similar solvents to explore
Available Variants
30 forms available
100% Liquid
Deionized Water, USP Grade
Deionized, filtered to <1 µS/cm conductivity
Deionized, USP Grade
Deionized/Distilled Water, USP Grade
Distilled Water
Distilled/Deionized Water
Purified Liquid
Purified Water
Purified Water (Conductivity <1 μS/cm)
Purified Water (USP Grade)
Purified Water USP Grade
Purified/Deionized Water
Purified/Deionized Water, USP Grade
Purified/Distilled
Purified/Distilled Water
Standard
Sterile Purified Water
Deionized Water
Deionized Water (USP Grade)
Deionized Water, USP Grade
Deionized/distilled, USP grade, microbiologically tested (<100 CFU/mL)
Filtered municipal or RO water
Filtered municipal or RO water, < 50 ppm TDS
Potable filtered water, < 50 ppm TDS
Potable filtered water, municipal or RO
Potable municipal water, carbon-filtered, < 50 ppm TDS
Purified / deionized water
Purified/Deionized Water
USP purified water, deionized, <10 CFU/mL
Quick Reference
- Full INCI Name
- Aqua
- Common Name
- Deionized Water
- CAS Number
- 7732-18-5
- Category
- general