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Pollution from runoff – also known as nonpoint source pollution – comes from many different sources. It’s caused by rainfall or snowmelt moving over and through the ground. As the runoff moves, it picks up and carries away both natural and man-made pollutants, finally depositing them into lakes, rivers, wetlands, coastal waters, and even our underground sources of drinking water. As a homeowner, you can help by controlling the sources of pollution in your own backyard: Have your septic tank pumped and get the system inspected regularly. Use fertilizers sparingly and sweep up any excess from driveways, sidewalks, and roads. Never dump anything down storm drains. Direct roof runoff away from paved surfaces and bare soil. Check your car for fluid leaks, recycle your used motor oil and make sure that you pick up after your pet!