the phosphorus concentration must not exceed 1.0 mg/liter; if to a lake via 

 a river, 2.0 mg/liter. Similarly, Illinois has adopted an effluent stand- 

 ard of 1.0 mg/liter phosphorus for discharge to Lake Michigan. 



In Iowa, laws were passed in 1971 that provide for mandatory soil con- 

 servation. Iowa's Conservancy District Act established conservancy dis- 

 tricts and declared soil erosion resulting in siltation damage to be nui- 

 sance. The act also directed the commissioners to establish soil-loss 

 limits for their districts. 



The Wisconsin Shoreland Protection Statute authorizes and requires 

 counties to adopt pollution-control regulations for the shoreland areas. 

 The law sets out zoning, sanitary code provisions, and subdivision regula- 

 tions. 



Indiana, Iowa, and Minnesota have adopted various kinds of farm-animal- 

 waste regulations, aimed chiefly at problems related to large feedlot 

 installations. 



A number of states have acted to limit the phosphorus content of deter- 

 gents. New York and Indiana passed such laws in 1971. The New York law 

 reduced the phosphorus content to 8.7% by January 1972 and to a trace by 

 July 1, 1973. The Indiana law limited phosphorus to approximately 5% after 

 the beginning of 1972, and to 3% after January 1973. The law has changed 

 in 1972 to read 8.7% after January 1, 1972 and to zero after January 1, 

 1973, Indiana thus becoming the first state to completely ban phosphorus in 

 household laundry detergents. 



Laws limiting phosphorus in detergents were also passed in Florida, 

 Maine, Michigan, Minnesota, Connecticut, and Oregon, as well as in Chicago, 

 Illinois, Akron, Ohio, and Dade Country, Florida. 



The Environmental Protection Agency is presently drafting phosphorus 

 criteria for recreational waters. Although the agency does not propose a 

 limit of acceptability for phosphorus, it gives guidelines for the 

 establishment of total phosphorus criteria in receiving waters. These will 

 include both a concentration, which prescribes maximum acceptable levels, 

 and a loading value in the form of an annual allowable specific loading to 

 the receiving water. 



The United States and Canada joined together on April 15, 1972, under 

 the Great Lakes Water Quality Agreement "to restore and enhance water 

 quality in the Great Lakes system" (Great Lakes Water Quality, 1972). 

 Annex 2 of the agreement pertains to control of phosphorus. It specifies 

 effluent requirements for municipal waste treatment plants, goals for in- 

 dustries, and reductions in input from animal husbandry operations. 



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