Pass your wastewater certification exam the first time! This study guide is specially developed to give wastewater operators practice answering questions that a

The Wastewater Operator's Guide to Preparing for the Certification Examination was prepared jointly by the Water Environment Federation, the Association of Boar

Formerly WEF/ABC Certification Study Guide for Wastewater Treatment Personnel, this newly revised and expanded version of the best-selling WEF/ABC publication i