Nonpoint Source Pollution is water quality's number one threat. Nonpoint source pollution is caused by rainfall or snow melt moving over and through the ground, picking up natural and man-made pollutants.
- Sediment from improperly managed construction sites, crop and forest lands, and eroding stream banks
- Bacteria and nutrients from livestock, pet wastes and faulty septic systems
- Excess fertilizers, herbicides and insecticides from agricultural lands and residential areas
- Oil, grease and toxic chemicals from urban runoff