PHI Plumbing is a master licensed and insured plumbing business that has served residents in the Denver Metro area since 1995. We pride ourselves on timely, quality and reasonably-priced plumbing services with integrity at the forefront of all of our business operations. We serve residential, commercial and industrial customers in Denver, Thornton and surrounding cities. Find out more about our plumbing services! Professional, timely work PHI Plumbing arrived on-time and finished the work promptly at our house in the Denver / Thornton area.