Based on field trials, Northern Tilth demonstrated that the Kennebunk, Kennebunkport and Wells Water District’s water treatment residual could be successfully used as the mineral component in manufactured topsoil. Northern Tilth obtained the first water treatment residual recycling permit issued by the Maine Department of Environmental Protection. Northern Tilth continues to work with the water district in developing topsoil blends that are used by local contractors to improve the qualities of commercial topsoil.
