Paper carton shortages are forcing some Minnesota school districts to prepare to ration milk. The Burnsville-Eagan-Savage District is the latest to roll out a rationing plan.

The Burnsville-Eagan-Savage District is preparing to ration milk at school lunch amid growing shortages in the paper carton supply chain.

Lisa Rider, the district’s executive director of business services, said the district’s plan would impact secondary schools before the elementary schools.

In a presentation to the school board on Thursday, Rider said milk would be rationed by discontinuing milk service at one or all of the daily meals.

According to Rider, districts in South Washington County, Stillwater, Hastings, Inver Grove Heights and South St. Paul are among local districts that’ve been unable to purchase 8-ounce milk in paper cartons.

A worsening paper carton shortage exacerbates the food and beverage supply chain fluctuations districts have weathered throughout the year.

A rise in e-commerce shipping is among the top drivers of the paper and cardboard shortage, according to a report by The Food Institute.

Minnesota students impacted by milk rationing may find few alternatives during school lunch. According to Rider, popular milk substitutes — such as bottled water and juice —are also limited and cafeterias are even struggling to find cups.

“Cups are also severely depleted in the supply chain so we will be encouraging students to bring water bottles from home,” Rider said on Thursday.