The Northeast regional office for the Massachusetts Department of Environmental Research is in Wilmington. MassDEP makes sure the Bay State is clean and safe for all residents. Preserving the state's wetlands and other resources, recycling the state's waste products, ensuring a speedy cleanup of any hazardous materials, and ensuring the state has clean air and water, free of toxins, are just some of the MassDEP's main responsibilities. On Tuesdays and Thursdays from 9am to noon (except on state holidays), the public can review all non-confidential files here.