For example, changes in the district's ash management system significantly reduced mercury and lead content in sludge and effluent. Further, the district's industrial pretreatment program is guided by some of the most stringent limits for metals content in the nation. Through this program, district employees work closely with industrial customers to help them identify and address problems, with a goal of meeting the required pretreatment limits. Finally, bans have been placed on the disposal of specific materials, such as latex paint and antifreeze, in sewers. The district's HHW program, located in a permanent building since 1993, was the first in Minnesota to accept hazardous wastes from small businesses through its Clean Shop program.
Education programs are another important element of the district's pollution prevention strategy.
MercAlert is a public education program that focuses on mercury and mercury-containing products. The district has established a collection network for button batteries in northeastern Minnesota, conducted teacher workshops on mercury and developed audiovisual and print materials about the management of mercury-containing products, including a guide for dental offices. District staff are continuing these important efforts by developing an outreach program to assist dentists and a project for homeowners that stresses reducing use of lawn pesticides. These programs combine educational efforts with on-site visits and technical assistance for customers. The most recent effort of the district is the development and implementation of a Zero Discharge Pilot Project, focusing on mercury, lead, PCBs, dioxin and hexachlorobenzene.