Where does neiwpcc work? In addition to region-wide work at our Lowell, Massachusetts, headquarters, NEIWPCC manages or supports programs and environmental training in its seven member states. Many programs focus on a particular watershed or area. Learn More Additional NEIWPCC employees work in state offices across the region. Learn MoreHow do i update my information in neiwpcc lists? NEIWPCC maintains lists of approved system inspectors and soil evaluators. To update your information in NEIWPCC's lists, please contact them directly:What is the renewal policy for maine depdep and neiwpcc certifications? DEP and NEIWPCC work closely to ensure the Program operates efficiently and effectively. Renewal Policy: Maine certified wastewater operators are due to renew their certificates biennially no later than March 1, as follows: