With winter in full swing, officials at Aquarion Water Co. are warning people not to trespass at local reservoirs for recreational activities.

“Over the last few weeks, we have seen an increase in unlawful winter recreational activities on our reservoir properties, including walking on reservoir ice,” Stephen Stamos, Aquarion’s manager of natural resources, said in a news release. “We want to remind people that not only is it illegal to be on Aquarion reservoir property, but it is also extremely dangerous.”

Locally, Aquarion has a reservoir in Stonington. At this time of year, ice may appear thick enough to walk on, but officials at Aquarion say this thickness is unreliable and can be deceptive due to shifting water levels and thermal undercurrents. In addition to the physical danger, trespassers also face the possibility of fines or arrest if caught on Aquarion reservoir property.

Aquarion encourages residents to contact their local parks and recreation department for alternative winter activities.