The web Browser you are currently using is unsupported, and some features of this site may not work as intended. Please update to a modern browser such as Chrome, Firefox or Edge to experience all features Michigan.gov has to offer.
Riveridge Sewage Lagoon (Grant, Newaygo County)
Web content may not routinely be updated on this page. Please contact the Site Lead for the most up-to-date status of the site.
Content posted April 2023.
EGLE Site Lead
Kent Walters, WaltersK7@Michigan.gov or 616-278-4350.
Riveridge Sewage Lagoon, located at 12624 South Ferris Avenue, is small sewage lagoon system authorized by EGLE to discharge 2,600 gallons of treated wastewater per day to groundwater. When the lagoons no longer met the standards for operation, the site elected to close the lagoons in favor of an underground drain field. In order to achieve lagoon closure, the site had to remove leftover lagoon residuals and demonstrate that native soils and groundwater had not been impacted by the operation of the lagoons. Lagoons sludges were removed and disposed of at a licensed landfill. Native soils and groundwater were tested for impacts. PFAS groundwater sampling was requested by EGLE, due to the presence of PFAS in everyday household products that may end up in a sewage lagoon. The site installed four groundwater monitoring wells to determine if groundwater had been impacted. The well installed underneath the lagoons exceeded PFOS criteria at 21 ppt (compared to 16 ppt). Two additional wells immediately downgradient of the lagoons were below criteria.
Groundwater onsite flows to the southwest. There are no nearby surface water bodies, so impacts are limited to groundwater located immediately beneath the lagoon.