Storm Water Management

Storm Water Management Program

The Ohio Environmental Protection Agency (EPA) requires the City of Troy to administer a Storm Water Management Program to address the quality of storm water runoff.  Storm water is water from rain and melted snow that flows across the ground and pavement that seeps into the ground or drains into a storm drain.  Storm drains are usually located at street corners and are often called “storm water catch basins”. The primary function of a storm water drainage system is to collect rainwater that drains off properties and onto the roadway, and carry the rainwater into a creek, stream, river…etc. Inadequate storm water management can result in flooding, structural and property damage, soil erosion, and polluted water quality that may lead to problems in the public water supply and other bodies of water. For further information regarding the Storm Water Management Program contact the Engineering Office at (937) 339-9481.

Equivalent Residential Unit Program

To fund the Storm Water Management Program, the city established a fee through an Equivalent Residential Unit (ERU).  An ERU is defined as the amount of impervious area on a typical residential lot.  Impervious areas include, but are not limited to, concrete, asphalt, rooftop, blacktop and compacted gravel. The average square footage of impervious area for residential lots in Troy has been determined to be 3,000 square feet. Therefore, one ERU is equal to 3,000 square feet.  This fee applies to all properties within the City of Troy and is placed on monthly utility bills.  The collected fees will only be used to comply with the federal regulations, improve water quality and upgrade storm water infrastructure.

For more information regarding this program, please click on the link to the ERU Brochure. 

Stormwater Education

The City of Troy strives to provide education regarding storm water management for our residents and businesses.  For more information, visit 


Stormwater Diagram