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01-27-15
NEW Added 100 question practice test which shows answers immediately, instead of at the end.
11-10-14
Complete redesign of website to match our Water Distribution Certification website. Also, working on new content to be added soon.

Aeration - The process of adding air to water either by passing water through air or passing air through water.

There are more than 56,000 community water systems providing water to the public in the United States.