The WQA Glossary of Terms

This Glossary is published by the Water Quality Association (WQA) as a service to members and leaders in education, government, and industry.

© Copyright 2013 by Water Quality Association


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P Purified Water
Wednesday,Sep 1, 1999
Water produced from water meeting the USEPA standards for safe drinking water through treatment by distillation, reverse osmosis, deionization, or other processes and which meets United States Pharmacopoeia (USP) purity standards for "purified water" can be labeled as "purified."

These standards regulate pH, chloride, sulfate, ammonia, calcium, carbon dioxide, heavy metals, oxidizable substances, total solids, and bacteria.

If water meeting the USP standard has been distilled, it can alternatively be labeled "distilled water."