The City of Marshalltown, Iowa, wanted to take advantage of a funding program through the State Revolving Fund that required a watershed assessment of a community’s water quality needs. When funding was approved, the City chose to move forward with the South 1st Street Parking Lot Improvements Project.

The parking lot was transformed using more than 1,130 square yards of permeable pavers that capture stormwater runoff which is then filtered and stored by storage aggregate underneath the pavers. This decreases downstream impacts by greatly reducing pollutant transport discharge rates and preventing flooding.

Other project elements included:

  • 2,100 square yards of concrete pavement
  • More than 8,500 cubic feet of stormwater storage volume
  • Landscaped parking islands
  • A new trash enclosure
  • LED lighting
  • An electric vehicle charging station

The Iowa Chapter of the American Public Works Association (APWA) awarded this project a 2022 Project of the Year Award in the Environment $500K-$1M category.