A Stakeholders Advisory Committee (SAC) was formed in late 2015 to begin addressing the stormwater needs of the Township and determine an equitable fee structure to fund those needs. The SAC identified over $27 million in stormwater improvement needs and determined a Stormwater Program Fee based on impervious area (IA) was the most equitable way to fund the program. Impervious area is any surface which inhibits infiltration of rainfall into the soil. This includes pavement (asphalt, concrete, etc.), rooftops, patios, sidewalks, and compacted graveled surfaces such as parking areas and driveways. Numerous studies have shown that IA is a strong indicator of both the quantity and quality of stormwater.
Once the Stormwater Program Fee method was determined, an analysis of the Township's IA was conducted and this information was used to calculate a fee. The fee is based on an Equivalent Residential Unit (ERU), which was statistically determined to be 3,800 square feet. The DTMA Board set the ERU fee at $6.50/month/ERU. This fee was calculated by taking the monetary costs to run the program and dividing by the number of ERUs in the Township. The DTMA Board set the fee implementation date as January 1, 2017. So beginning in January 2017, property owners in Derry Township with a minimum of 500 square feet of IA will begin receiving a stormwater program fee bill. For those property owners who already receive a sewer bill, the stormwater fee will be a new line item on that bill. Those property owners who aren't connected to the public sewer will receive a stand-alone stormwater bill. For the typical residential home (1 ERU), the stormwater fee will be $6.50/month ($78.00/annually). For non-residential properties, the stormwater fee will be calculated by dividing their total IA by 3,800 square feet to determine the number of ERUs. The number of ERUs will be multiplied by $6.50 to determine the monthly charge. For example, a commercial property with 19,000 square feet would equal 5 ERUs (19,000/3,800 = 5). That property's monthly fee would be 5 x $6.50 = $32.50 ($390.00 annually).