May 23, 2021 18:32 Updated Follow Call at least two full business days in advance. Remember that the call and service are free, and are required by law. Related articles What are the rules about tree trimming? Who do I contact before I dig? Who do I contact to get information about a sick tree? If I'm a NIPSCO customer and I switch to a different natural gas service provider, will I save money? How can I encourage renewable energy development in Indiana?