-in indusltaizied countires water pollution laws have reduced it
-in developing countires pollution is getting worse but safe drinking water is imporving
-water pollution, any phsyical bioligial or chem change in water qulaity
-classified: point source, not point source
-major types: infectous agents, oxygen demanding wastes, nurtients, inorganic salts metals acids and bases, orgaic chemicals, sediment, and thermal pollution
-eutrophication: nutirient enrichment and warming
invloves rapid palnt growth and resluts in rapid decomp and oxyegn deplet. in aquatic systems
-Clean Water Act: monitor water quality and regulate discharge
-groundwater contaminated by waste from recharge zones. leeking underground storage tanks
-ocean pollution: grabage, sweage, nutrients, and oil spills
-source redustion: cheapest most effective way
-sweage treatment most impritant steps in maintaining clean drinking water.
primeary removes strains soilds
secondary includes areation, digestion, and chlorination
tertiary removes inorgic nutirents and oxidizes remaining organics
- water legislation=contraversial: high costs
