If someone comes knocking on George and Doris Stewart’s 35-foot camper after midnight, they’ll both answer, but it had better be something urgent, like a gang of raccoons pilfering hot dogs or a broken black water line on an RV, according to The Philadelphia Inquirer

“That’s the toilet water,” Doris, 65, explained at a picnic table beside their camper last week at Colonel Denning State Park in Cumberland County, Pa.

The Stewarts are part of a small army of volunteers, most of them retirees, who live rent-free at the dozens of Pennsylvania state parks that offer camping. They are called campground hosts and are given their own campsite by the Department of Conservation and Natural Resources (DCNR), free of charge, for a month at a time or longer during the season, as long as they perform a variety of duties.

Campground hosts collect fees, offer directions to sites, clean out fire rings, and generally act as friendly faces for visitors to meet when they get there. Cricket, their blind Shih Tzu mix, is the official campground host dog.

The gig, the Stewarts said, feels a little bit like camping and a little bit like work, and that’s the way they like it.

So far in 2019, DCNR officials said 35 campground hosts have volunteered 9,700 hours of service at state parks. Some have been doing it for 25 years. Bureau of State Parks Director John Hallas said hosts were an “invaluable and necessary component” to the system.

“They are our very talented ambassadors of our parks for our overnight guests,” Hallas said in a statement.

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