In many cases, communities simply don’t know the sources of their beach water
pollution. Rain is often a factor contributing to beach water pollution. Heavy rain can
overwhelm sewage systems, forcing overflows directly into coastal waters. As
rainwater washes over land, it picks up pollutants like motor oil, pet waste, pesticides,
fertilizers, animal droppings and anything that washes off land. Other miscellaneous
sources include wildlife, marine traffic discharges and sewage spills.