"Upon further investigation of a single rat found in a farm yard south of Highway 41A, several rats were spotted in the Medicine Hat landfill," city officials said in a press release.
"These rats were found as a result of this monitoring, which shows that our monitoring program is working. Additional bait stations have been put out to poison rats, and staff are checking sites daily."
Officials have monitored a "three mile buffer zone" around the landfill for rat activity since 2012, when an infestation of rats was discovered.
"Thanks to Albertans’ vigilance, and the quick response of provincial and municipal inspectors, rats have been unable to make a permanent home in this province," the release said.