Specialty Irrigation Systems was formed on November 10, 1987 as a sole proprietorship. Specialty Irrigation Systems officially opened its doors for business on February 27, 1988. After fourteen prosperous years in business, Specialty Irrigation Systems became incorporated. Official date: July 01, 2002. SIS, Inc. started very small with a single work van and two employees. Founder Kevin Valentine always envisioned building a company that would cater to a select customer base whose standards required the best in irrigation services.