Liquid and solid waste materials left on the ground pose a potential hazard to human health and safety and water resources. Materials that are left on streets, sidewalks, and driveways can be washed into storm drains the next time it rains. Storm drains are directly connected to local streams and rivers; water entering storm drains does not receive treatment. Substances can also soak into the ground with the rain where they can potentially become part of the groundwater that we use for drinking water.