Animal waste products or human sewage

Sediment or dirt

Trash

Fertilizers

High levels of sediment in the water

Pathogenic (disease causing) bacteria in the water

Low dissolved oxygen levels in the water

Harmful mutations in fish and frogs

Excess water in storm drains can host alligators and other dangerous animals

The water that goes into storm drains can flood houses and businesses

Water that goes into storm drains isn't usually cleaned before it goes into the watershed

Water flowing into underground storm drain systems can form caves and cause subsidence

The tank or its pipes could crack and leak sewage, which could pollute the groundwater

Harmful chemicals from the concrete can soak into the soil and be washed into creeks

The force of the heavy tank could force water out of the aquifer and cause subsidence

The toxic chemicals in the tank could kill nearby plants and lead to soil erosion

Using fertilizer on lawns and crops

Allowing pet waste to wash into the watershed during rains

New construction of neighborhoods and businesses

All of these choices

Cover bare soil with concrete or bricks

Spray fertilizer on the soil

Plant grasses, shrubs, and trees in the soil

Put fences around all areas of bare soil

A factory releases harmful liquid chemicals

A river has high levels of sediment

A blockage in a sewer system causes an sewage overflow onto the street

A tanker truck spills 800 gallons of chemicals onto the highway

An area in the ocean has high levels of nutrients

A creek has high levels of bacteria

Plastic trash is floating in the river

Waste from a coal mine is leaking into a local creek

Pollution spilled on the surface percolates down through soil and rocks

Underground storage tanks crack and leak

Underground sewer and septic pipes crack and leak

All of these

Runoff

Soil erosion

Pollution in our watershed

All of these

Unusually high activity of gophers and moles

Removing too much oil and coal from underground

Removing, or pumping out, too much water from an aquifer

Water pollution, such as bacteria, nutrients, or sediment