Nonpoint Source Pollution

Most people believe that the largest source of water pollution comes from a pipe, such as from factories and sewage treatment plants. But the fact is that the largest source of water pollution in Oregon's rivers, lakes and streams comes not from a pipe - but from surface water runoff. This type of pollution is sometimes called "nonpoint source" pollution because it comes from a wide variety of sources, not from a single discharge pipe.

When it rains, water washes over driveways, roofs, agricultural lands, streets, lawns, construction sites, and logging operations picking up soil, garbage and toxics. The amount of pollution carried by rainwater, snowmelt and irrigation water flowing into streams and lakes, and through the soil into groundwater is much larger than pollution from industry.

Polluted runoff causes damage to fish, wildlife and their habitat; damages drinking water supplies, promotes excessive weed growth and degrades Oregon's scenic beauty and recreational opportunities.

Program Topics

Introduction Program Plan Annual Reports Section 319 Grants Related Information and Links Runoff Reduction Success Stories DEQ Funds Portland Library Eco-roof new Contact Information

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