Improper sampling is one of the most common errors in water quality analysis. This video gives operators approved, step-by-step procedures for taking water samples for coliform testing. Particular attention is paid to the all-important step of selecting sampling sites. The procedures shown comply with the Total Coliform Rule and the Safe Drinking Water Act. This DVD will help utilities avoid false test results and violations, while it helps you maintain public confidence in the quality of the water supply.