1. Never dump anything down storm drains or into streams and report anyone who does.
2. Replant bare spots in your yard and preserve streamside vegetation.
3. Direct rooftop downspouts away from paved surfaces.
4. Take your car to a car wash or wash it on an unpaved area.
5. Check your car for leaks and recycle your motor oil and antifreeze.
6. Pick up your pet waste; it can carry harmful bacteria and parasites.
7. Have your septic tank pumped and system inspected regularly.
8. Choose low-maintenance, native plants that require fewer chemicals and less watering and sweep up debris from driveways and sidewalks.
9. Consider alternatives to impervious surfaces such as pervious pavement, paving blocks, gravel cobbles, brick and natural stone.
10. Get a rain barrel to collect stormwater and install an approved rain garden or green roof.

http://www.greenglancy.com/10-tips-for-preventing-stormwater-pollution/