West Mifflin police say 20-year-old Grace Brown is facing multiple charges including criminal mischief, open lewdness and public drunkenness. It wasn't known if she has retained an attorney.
Brown turned herself in Tuesday after learning that authorities were looking for her.
Authorities had posted surveillance photos of the incident on Twitter. But they haven't said when the incident took place or why she allegedly relieved herself on the potatoes.
A Walmart representative has said an employee saw what Brown was doing. The company "immediately disposed of the affected products and sanitized the area."
In Porter, Texas, a 15-year-old boy was arrested after video was posted on social media of the teen urinating on a shelf at a Walmart store there. The Montgomery County Sheriff's Office said due to his age, his name cannot be released. They say charges for tampering with a consumer product have been sent to the county attorney's office.
These incidents come weeks after video posted on social media showed people licking ice cream from Walmart freezers in Texas and Louisiana.
RELATED STORIES
Man caught on video licking Blue Bell ice cream in Louisiana
Woman licks inside of Blue Bell Ice Cream tub before returning it to store freezer
Blue Bell licking: Teen will not face adult charges in viral ice cream stunt
The Associated Press contributed to this report.