The ordinance orders that county retailers who sell any keg of alcohol, or two gallons or more, for off-site drinking stick a numbered label on each keg. When people purchase a keg, they must provide a current government-issued ID and a minimum deposit of $30.
The retailer has to log the keg-tag number, the date of sale, the purchaser's name, address and ID number, and the initials of the retail employee for each keg sale.
Retailers have to keep that log for 90 days and give it to law enforcement officers on request so they can track the buyer.
If officers find a keg without a sticker or with a damaged sticker, the purchaser can be fined up to $500 and serve up to 30 days in jail.
"And these are real hard to peel off," said Chief Deputy Craig Bartolozzi.
The county supervisors reviewed a draft of the rule on Tuesday. Now it simply awaits public hearings and publication before it will be officially made law.
Supervisor John Schneider pointed out that people could still buy kegs in other counties and bring them across county lines, and Bartolozzi said that they're hoping to see a statewide ordinance to unite the 99 counties.
"A lot of counties are jumping on board," he said. "Woodbury County has adopted theirs and it's in effect already, Sioux County is looking at one, but I don't believe Cherokee County has one."
As for crossing state lines, carrying kegs is illegal.
"You can only bring so much alcohol across a state line, and obviously a keg would be too much," Bartolozzi said.
County Attorney Darin Raymond said he'd check with other county attorneys on how to address that issue.
"Story County has had this ordinance for six years," he said. "Certainly if somebody's figured some way around this, they've experienced it down in Story County."
The keg ID stickers, which cost around 25 cents each, will be provided by the county to retailers.
If this becomes a rule in Plymouth County, it will only be the county's second ordinance.
"We're not an ordinance-heavy county," Raymond said. "I believe we have one other ordinance, and it prohibits parking on K-22."