In general it is very hard to say how long a virus can survive. Some virusses can withstand a lot, others not.
Personally I would not worry too much, because on the one hand the virus did come froms somewhere, indicating you most likely had a source somehere near your house, and on the other hand virusses tend to be highly specific. As no Loricaris does life around your house

chanses of contaminating the local wildstock are very slim - at most.
However, if you do prefer to do something before dieposing of the water, virusses are vulnerable towards UV radiation, but less than bacteria. Hence a fairly large doses would be required.
Perhaps another option could be to add some hypochlorite (commonly sold as bleach) to the water, but I do think the cure would be worse than the problem