0.08 percent In Iowa, the legal limit for OWI for those over age 21 is a blood alcohol content of 0.08 percent. For a person under the age of 21, however, the legal limit is 0.02 percent. Aug 31, 2016
0.08 percent In Iowa, the legal limit for OWI for those over age 21 is a blood alcohol content of 0.08 percent. For a person under the age of 21, however, the legal limit is 0.02 percent. Aug 31, 2016