NORTH PORT — A sewage odor that has come and gone — and come back again — at Lamarque Elementary is worrying staff, students and parents who have to smell it, and frustrating administrators and Sarasota County School District officials who want to end the olfactory problem.

In a notice dated Oct. 31, the Occupational Safety and Health Administration sent a notice of alleged safety or health hazards to Lamarque, citing an “Area of 19 classrooms, 5 resources classrooms/offices, 1 custodial office, 1 cafeteria and food service kitchen and 1 teachers lounge” where a sewage smell was detected. The notice also stated employees complained of headaches, dizziness, nausea and other symptoms. It was prompted by an anonymous letter from a Lamarque teacher, claiming the smell has been intermittent, returning more strongly each time, since the school opened as North Port’s fourth elementary school in 2006.