Williams Plumbing & Heating Billing | 4003 1st Ave S. Billings, MT 59101 | (406) 534-8075 | https://www.willplumb.com/ | Williams is the Northwest's largest plumbing and civil contractor. Founded in 1979, we offer a comprehensive line of quality plumbing, civil construction, HVAC, green energy, consulting, and service solutions to meet the needs of just about any building project.