In 2009 the City of Greenfield established a Storm Water Utility to help comply with more stringent federal and state regulations regarding storm water management.
Revenues collected by the Storm Water Utility will be used to fund public education and outreach, regulatory compliance and water quality and/or flood control improvements.
Storm Water Utility fees are based upon a calculation of impervious surfaces (i.e. roofs, driveways and other hard surfaces). Greenfield’s average impervious surface per residential unit is 3,630 square feet, or 1 Equivalent Runoff Unit (ERU). Currently, the quarterly equivalency charge is $15.00 per ERU which is applied to all parcels that have impervious surfaces.
Single family properties are charged based on 1 ERU, or $15.00 per quarter. Duplexes are charged based on 1.1 ERUs, or $16.50 per quarter. Three unit and larger residential, school, church, business, and municipal properties will be charged fees based upon a measurement of actual impervious surface divided by 3,630 square feet to determine the number of ERUs. For example, a business property with 10,909 square feet of impervious surface has 3 ERUs. The quarterly charge would be $15.00 X 3 ERUs, or $45.00.