First conviction: If you are convicted of an OWI for the first time, you will be required to serve from two days to one year in jail and pay a fine up to $1,000. You will also lose your license for six months.
Second conviction: If it is your second offense within 12 years, you will lose your license for two years, be given a seven-day to two-year sentence, and be fined $1,500 to $5,000.
Third conviction: A third offense within a 12-year period is a Class D felony that will earn you up to five years in jail and a $2,500 to $7,500 fine. You'll lose your license for six years.
In addition to spending time behind bars, paying a hefty court fine, and losing your driving privileges, you will also need to complete a course for drinking drivers and undergo a substance abuse evaluation or treatment program―whether this is your third offense or your first. Iowa law requires that you pay for these services at your own expense. You'll also be hit with a $200 fine that goes toward the state's victim restitution fund.
http://www.dmv.org/ia-iowa/automotive-law/dui.php