Refer to the Lake Pontchartrain Basin Water Pollution Map in Appendix A.
Water pollution comes from either
a POINT or a NONPOINT SOURCE.
Let’s look at some similarities and differences
between the two types.
Point source pollution
because it enters the water directly, can be easily traced from sources such as
factories and chemical plants. But nonpoint source pollution, harder to trace and to
treat, can cause long-term damage before the problem is handled. It can come from
many different sources and travel long distances through a watershed before it is
Nonpoint source pollution
provides a greater chance for chemicals to mix and react together. This is
known as the synergistic effect. A combination of two or more contaminants
can be even more harmful than the original pollutants-and harder to treat.
In fact, nonpoint source pollution is the major cause
of water pollution in the Lake Pontchartrain Basin.
Do you realize that most nonpoint source pollution comes from runoff?
Rainwater or wastewater carries various pollutants along as it flows into our lakes,
streams, and rivers. Urban runoff from the southshore of Lake Pontchartrain and agricultural/ sewage runoff from the northshore are causing serious water pollution problems in the waterways of the Basin.
Here is a chart to help you understand some of the key nonpoint sources:
Some of the same pollutants in urban runoff can also be found in
agricultural runoff. Which ones are they? How do they differ?
Are there any pollutants unique to agricultural runoff?
COMPLETE THE FOLLOWING CHART:
(link to pdf)