At the end of a successful power washing episode, water suddenly began gushing out from the bottom of the machine. We had no problems using it but now I am afraid it is broken. Does anyone know what this means? Is it normal? If not, is it expensive to repair?

Hi,
You need to provide a bit more to go on. They have a dedicated site at:
Husky Home Depot Power washers, Home Depot Husky Powerwasher Accessories, Parts for Husky Powerwasher
But a model is needed. Parts are in Store.
Peace,
Clarke