(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.
The U.S. Environmental Protection Agency, which is ultimately responsible for enforcing the Clean Water Act, has handed over that responsibility to 46 of the 50 states, including Washington and Oregon. In Idaho, the EPA handles that job. (Ashley Ahearn from EarthFix/KUOW reports from the Duwamish River.)