During 2014 all homes and businesses connected to Grinnell's sanitary sewer system will need to be inspected for improperly connected sump pumps. Per city code, sump pumps need to discharge to the storm water system or to your yard. To schedule your free inspection call the city office at 641-236-2600, their office hours are Monday - Friday, 7:30 a.m. to 4:30 p.m. More Information