You may have thought that having to pick up your pet's waste was just for aesthetic reasons, but it has an environmental reason too. When it rains on a yard full of pet waste, the minerals in the waste, such as nitrogen and phosphorous, runoff into storm drains. Then, the runoff from the storm drains flows into nearby water sources. The nitrogen and phosphorous remove dissolved oxygen in the water and lead to algal growth which also removes dissolved oxygen. Without enough dissolved oxygen in the water much of the natural life dies. So just remember that waterways are all connected and that anything that you put in your yard may end up in local water. This calls for things other than pet waste, such as motor oil, zinc and copper from worn pipes, and lawn fertilizers.
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