The jury stated that Ride the Ducks International, the producer of the duck boat vehicle, was 67-70% responsible for the crash, while Ride the Ducks of Seattle, the duck boat company, was 30-33% wrong.
Duck boat – a vehicle that can run on both land and water – crashed with a bus that brought students and staff from North Seattle College to the city's Aurora Bridge in September 2015. The crash left five people dead and dozens injured.
The verdict handed down on Thursday stated that the manufacturer provided an insecure product and violated product liability laws and said that the tour operator had been negligent.
Victims of victims and families had also sued the city of Seattle and the state of Washington, but were also not found liable.
Following the verdict, Ride the Ducks of Seattle issued a statement saying it has made significant structural changes in parts of its vehicles and initiated regular testing in addition to Washington State and US Coast Guard inspections. The tour operator also said it did a "top-to-bottom review" of its activities and removed the Aurora Bridge from its route.
"Since the tragic accident on September 24, 201
Also riding the Seattle Ducks said it has been trying to repair its relationship with customers.
"We have worked hard to regain the trust of those we serve and will continue to do so in the future," the company said in its statement.
CNN has made several requests for comments on the company owns Ride the Ducks International, but has not yet received a reply.
Karen Koehler, the lawyer representing the duck-cat crash victims and their families, was pleased with the jury's decision, the Seattle Times reported.
Koehler also said she hopes that the decision will cause the company's vehicles to be taken away.
CNN's Marlena Baldacci contributed to this report.