[2] Howell joined Wanderers in July 2011 and made his senior debut in the St. Catherine Major League, receiving two yellow cards.
He returned to Waterhouse to begin the 2012–13 season, but after only featuring for the under-20 team, he left at the end of January to join Royal Lakes.
[3] Howell again returned to Waterhouse and made his National Premier League debut with the club during the 2013–14 season.
Howell scored in Des Moines' 2–0 defeat of the Michigan Bucks in the first round of the 2017 PDL playoffs.
[7] On 25 June, Howell made his first appearance on loan with FC Tucson, the Rising's reserve team in USL League One, in a 1–0 loss to North Texas SC.