Collecting rainwater is a simple, eco-friendly way to save money on your water bill when it comes to watering your lawn or garden. To make matters even more complicated, Michigan, Indiana, and Ohio all have different rules when it comes to rainwater collection. U.S. Department of Energy U.S. Department of Energy loading...READ MORE: The Most Beautiful Places In Michigan For Fall FoliageREAD MORE: The Most Beautiful Places In Michigan For Fall FoliageMichigan Rainwater Collection RegulationsTechnically, Michigan has no laws against collecting rainwater. Indiana Rainwater Collection RegulationsAccording to the information provided by the U.S. Department of Energy and other sources, Indiana has absolutely no regulations or restrictions on rainwater collecting. Ohio Rainwater Collection RegulationsOhio regulations are similar to Michigan's, but maybe a little more strict.