If needed, water run-off from your pressure washer can be easilycollected and safely disposed of in gardens or lawns.
The cheapest andeasiest way is to place a few shovelfuls of play pit or beach sand in apolypropylene sugar or potato bag and place that in the lowest spotwhere the water will run, like next to the curb or over a sump, forinstance.
Using a 15 Gallon Wet-Vac, and powering it with a small generator,will suck up the water. Dilute it down and dispose of it as ‘graywater’. Ideally, all professional graffiti removal contractors shouldhave this set up available.
Unlike other commercial hard surface cleaning such as pressurewashing pavements, graffiti removal uses very little water.
In fact thepressure washer is used as a quick release rinse only of dissolved orsoftened graffiti. This means there is far less water to worry about incomparison to general power washing chores.