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...The clean water act and challenge of agricultural pollution jan g laitos heidi ruckriegle i introduction one last great intractable problems environmental law is america s waterways caused by agriculture there are many sources including fertilizers pesticides applied to row fields animal waste from livestock operations sediment loading tree farms these pollutants can devastate downstream watercourses adding ammonium nitrates nitrites phosphorous ambient quality lakes reservoirs experience eutrophication algae blooms depleted oxygen while rivers be impacted excessive salinity turbidity toxicity resulting in forever altered marine ecosystems although was intended restore maintain chemical physical biological integrity nation waters this goal never achieved if continues contaminate perversely itself part responsible for remaining outside scope reach requires protection agency epa issue limiting technology based permits discharge any pollutant but then explicitly exempts all return flows i...