W1.2 Public water systems
Increase the efficiency of public water systems (Group A and Group B). This includes replacing pumps and other systems that consume large amounts of energy, or repairing/reducing leaks. (Group A water systems have 15 or more service connections or serve 25 or more people 60 or more days per year; Group B systems serve fewer than 15 connections and fewer than 25 people per day.)
The EPA maintains a web page with links to their resources – “Water Efficiency and Conservation Resources for Small Drinking Water Systems”