Maryland is ranked fifth highest in population density in the country, according to City-Data, and half of the land that was in farms in Maryland in 1969 has been lost to development. Big yards are the rule, with half of the residential properties in Maryland between one-half acre and 20 acres, according to the Census of Agriculture. The Delaware River, the Susquehanna River and the Potomac River all run through Maryland and drain into the Atlantic Ocean. Over one hundred smaller rivers and creeks run into these bodies of water. What goes onto our yards washes into these creeks and rivers. This means homeowners, not just farmers, are putting a lot of nutrients and chemicals into the rivers and the bay, especially in light of the fact that the U.S. Fish and Wildlife Service says homeowners use up to 10 times more chemical per acre than farmers do.