An official website of the United States government.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Polluted Runoff: Nonpoint Source Pollution

Nonpoint Source Pollution: Darby Duck, the Aquatic Crusader

Become an Aquatic Crusader and join Darby Duck in the fight against water pollution!

What is the Crusaders' weapon?


Understanding the characteristics of water, that precious resource we are trying to protect. And understanding how it interacts with other elements in the environment, some of which pollute it and cause problems for people and animals.

How do you become an Aquatic Crusader?

There are seven experiments for you to try that will teach you the characteristics of water. When you complete all seven of the Aquatic Crusader tasks, consider yourself one of Darby's Crusaders too!

Experiment 1: Critter Scope

Experiment 2: What is Surface Tension?

Experiment 3: Shake it up Baby!

Experiment 4: Speedboats

Experiment 5: Exploding Colors

Experiment 6: Sink or Swim?

Experiment 7: No Water off a Duck's Back