Occoquan Swimming was founded in about 1986 as an attempt to provide a year-round program for the Ridgewood (located in Woodbridge) summer swim team. It was founded by Bryon Snyder and Marty Olsen. It initially started as a one-day per week stroke clinic at the Mount Vernon Recreation Center in Alexandria.

Bob Lindberg was recruited as a coach sometime in 1988 when OCCS was comprised of 60-80 swimmers, swimming primarily on Saturdays at the Mount Vernon site. Dave Tonnesen was recruited by Snyder and Olsen in the spring/summer of 1990 as the head coach and he developed a five-year plan for Occoquan. By the fall of 1990, Occoquan had the program at Mount Vernon, a 5-day a week program at the Dale City Recreation Center, and about 200 swimmers. The Mount Vernon program continued until about 1994, when the Mount Vernon site coach left and OCCS could not find a replacement. By that time, OCCS had started making significant contributions to Potomac Valley Swimming, including meet hosting, officials, etc. Dave Tonnesen served in several capacities in the PVS governing structure.

Occoquan continued to grow and expand, swimming in the 1990s and into 2000 at Dale City, Chinn (after it opened in 1991) and at Freedom Center at George Mason’s Prince William County campus. The program continued to grow and, at a maximum, had about 380 swimmers.

In the early 2000s OCCS hired Joel “Cy” Cyganiewicz and his son (later) to act as head coach.  Although there was some age group competitive success, the team numbers dropped to less than 240 swimmers and the philosophy changed from an all-inclusive team to a selective program swimming at the Dale City Rec Center, Chinn Fitness and Aquatics, and at the Freedom Center.