On the northern coast of Indiana, cooperative neighbors were key to a wastewater solution that serves the needs of adjoining properties on the sandy shore of Lake Michigan.The two homes are only a few hundred feet from the water. The eastern one was built in the 1950s, and the owner wanted to update it. Builders took it apart, reused some of the material, expanded it to eight bedrooms from the original three or four, and put the whole thing back into the same footprint as the original house. (Keeping the same footprint made permitting easier.) The four-bedroom house to the
