When it comes to dumping in Lake Mills, Iowa, there are a few options available for RV travelers.Rest Area I-35 NB/SB Northwood offers a convenient dump station for both black water and gray water.If you need to empty your tanks and refill your fresh water, the City Sewage Plant is a reliable choice.Another nearby option is the Owatonna Wastewater Treatment Plant, which provides dumping facilities for RVers passing through.R Campground also offers a dump station along with other amenities, such as an RV trash bin and RV waste disposal services.Some locations listed in this article are the nearest of their kind to the starting point, and the actual drivable distance could exceed 200 miles.