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Water Polution

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Water Polution
Introduction to Environmental Science 12:008/159:008
Spring 2002

Water Pollution

July 22, 2005

Water Pollution
Pollutant
Any substance that does not belong in the natural system and disrupts the natural balance Water Pollution
Degradation of water quality in a manner that disrupts/prevents its intended or original use.

Surface Water
Groundwater

MCL and secondary MCL
MCL=Maximum Contaminant Level
The highest concentration of a pollutant allowed in drinking water by law
Concentration above which adverse health affects are believed to occur

Water pollution contaminant types
Infectious agents
Oxygen-demanding Wastes
Plant nutrients and eutrophication
Toxic tides
Inorganic Pollutants
Metals, nonmetallic salts, acids and bases

Organic Chemicals
Sediment
Thermal Pollution and thermal shocks

Contamination of Iowa’s Water
Fertilizer
Pesticides
Sediment

Secondary MCL
Concentration of a pollutant above which the water is unpleasant in odor or taste
May not be hazardous to your health at that level 16. Water Pollution ‹#›

Introduction to Environmental Science 12:008/159:008
Spring 2002

phosphorous

phosphorous

nitrogen

nitrogen

Pollution Sources
Point-source
Smokestack / industrial effluent
Oil Tanker spill

Non point source
Atmospheric
deposition
Farm field runoff

16. Water Pollution ‹#›

Introduction to Environmental Science 12:008/159:008
Spring 2002

Surface Water

Surface Water

Sustains numerous ecosystems that fulfill important roles in biogeochemical cycles and the water cycle.
Source (major?) of food.
Major source of drinking water.
Recreational/aesthetic value

Photosynthetic organisms (light is essential). Phytoplankton - microscopic, floaters. green algae, diatoms, cyanobacteria.

Benthic Plants
Submerged (plant fully under water) pond weed, muskgrass

Emergent (plants partial above water) water lilies, cattails

Surface Water
Non
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