(See also How long does it take for seed to grow). Depending on the conditions, you can expect to see some grass seed mixtures germinate quite quickly. If conditions at the time of sowing are perfect, you may see germination is as little as 2-4 days.
Source: http://ipl.unm.edu/cwl/fedbook/fwpca.html Overview. The Federal Water Pollution Control Act, popularly known as the Clean Water Act, is a comprehensive statute aimed at restoring and maintaining the chemical, physical and biological integrity of the nation's waters.
To date, the water quality goals stated by Congress in the 1972 act have not been achieved by American society:  1 to make all U.S. waters fishable and swimmable by 1983;.  2 to have zero water pollution discharge by 1985;.  3 to prohibit discharge of toxic amounts of toxic pollutants.