1 Junkins Avenue, Portsmouth, NH 03801
(603) 610 -7273

Monday 8 AM – 6 PM

Tuesday – Thursday 8 AM – 4:30 PM

Friday 8 AM – 1 PM

(603) 427-1593
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Health Department
Toni McLellan
Toni McLellan
Health Inspector

Portsmouth Mosquito Control and West Nile Virus Program

Portsmouth has a dual-purpose mosquito control program, addressing both "nuisance" mosquitoes and mosquitoes of public health importance. 34% of Portsmouth is wetlands, where mosquitoes breed and develop. Additionally, since Portsmouth is a seacoast community with flat topography, numerous additional temporary, stagnant, shallow water areas develop due to snow melt and rain, adding to mosquito breeding areas. Without mosquito control to reduce the number, there would be many areas that would be inundated with biting mosquitoes.