Metropolitan Council Environmental Services, the regional wastewater utility in Minnesota’s Twin Cities metropolitan area, uses a website (www.metrocouncil.org/iandi) as part of its public outreach to educate residents on the cause and effect of inflow and infiltration and the property owner’s role in mitigation.

I&I has become a critical issue as sewer pipes age and the population grows. Although MCES has had an I&I reduction program in place since 2006, its communities...