There are three categories of properties.
•Lots that contain less than 0.25 ERUs of impervious surface area (currently, 575 square feet) are exempt from the stormwater user fee.
•One-, two-, and three-family residences are assumed to contain 1 ERU of impervious surface area, and pay a flat fee of $14.25 per quarterly billing cycle (once very three months). Classification of a property as a one-, two-, or three-family residence is determined by the Tompkins County Department of Assessment.
•All other lots pay a user fee based upon the amount of impervious surface area located on the property. Lots containing 0.25 to 1 ERU pay $21.75 per quarter, and lots containing more than 1 ERU pay $21.75 per quarter per ERU, assessed in 0.25 ERU increments. (For example, a commercial property with 3,700 square feet of impervious surface area would pay $38.06 per quarter (3,700 / 2,300 = 1.60, which is rounded up to 1.75.) Owners of these lots may apply for credits against the stormwater user fee for eligible management practices or structures.