hpt-vaccine-reopening-houlton-maine-mask-requirements-andys HOULTON, Maine -- May 24, 2021 -- Ed Sanders of Oakfield stands in the checkout line at Andy's IGA grocery store in Houlton, after mask requirements were lifted for vaccinated residents. (Alexander MacDougall | Houlton Pioneer Times) HOULTON, Maine -- May 24, 2021 -- Ed Sanders of Oakfield stands in the checkout line at Andy's IGA grocery store in Houlton, after mask requirements were lifted for vaccinated residents. (Alexander MacDougall | Houlton Pioneer Times) Houlton grocery stores begin welcoming maskless, vaccinated shoppers In another sign of normalcy beginning to slowly return, Houlton area grocery stores began welcoming vaccinated shoppers who no longer need to wear a mask on Monday, May 24.