The Approach: The City identified that Inflow and Infiltration (I&I) was problematic in the region and tested four different approaches to reduce I&I. [...] The Outcome: The City’s study revealed that mainline and lateral sewer rehabilitation contributed to a 60 percent reduction in stormwater inflow and infiltration. [...] The Trigger: In order to find a sustainable way to fund stormwater infrastructure, the cities of Kitchener and Waterloo decided to re-evaluate their stormwater funding system. [...] The Approach: The cities decided to calculate stormwater tax based on the amount of impervious area on each property. [...] The Outcome: The new rate structure established by Kitchener and Waterloo made it possible to have a dedicated and stable funding source to finance both the rehabilitation and improvement of stormwater infrastructure.