Does distilled water go bad?
VERDICT
CONFIDENCE
100%
Direct Answer
Distilled water does not go bad or spoil when unopened and stored properly. Because impurities and microbes are removed during distillation, it remains stable for years. After opening, contamination from air or containers can reduce quality over time.
What the Evidence Shows
All sources agree distilled water itself cannot spoil because distillation removes all organic matter and microbes, preventing bacterial or algal growth under proper conditions. It only becomes compromised by contamination after opening, CO2 absorption altering pH/taste, or chemical leaching from plastic in heat. Expiration dates on bottles reflect container integrity or manufacturer guidelines, not inherent water spoilage. WebMD and multiple water specialists confirm indefinite shelf life when sealed.
How long does distilled water last after opening?
After opening, use within 1-4 weeks for drinking if refrigerated and sealed to prevent contamination; for appliances, it lasts months if stored cleanly. Check for cloudiness, odor, or taste changes before use, as airborne bacteria or dust can compromise purity.
Can you drink expired distilled water?
Yes, if clear, odorless, and tasteless, as expiration dates reflect packaging, not water safety. Discard if contaminated, shown by off smells, particles, or chemical taste from plastic leaching.
How to store distilled water properly?
Store unopened in cool, dark places away from sunlight and heat; refrigerate after opening in clean, sealed glass or food-grade containers to minimize bacteria and maintain purity.
Sources & Methodology
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