Well, yes, and by the time those eventually arrive at the scene, you would hope for a decent amount of power!
Well depends on your geography

our fire ships aren't far from the canal locks, the power station, the navy, the shipyard, the cruise terminals, the central train station, the airport, ... though to be fair they can't reach the actual runway from the water, only the disused navy helicopter base.
All the water ?
As for power... the red one has more than 500kW in pumps, for over 1000m³ per hour of wet. I like how airport firetrucks specify in "per minute" because they run out of tank too quickly to think about hours ? that tugboat will only do 700m³ an hour ?
If you pay attention on boats you'll notice lots of boats actually have watercannons, I've seen them on every Norwegian fjord ferry for example. SAR ships too, coast guard, etc... the next watercannon is closer than you might think, if you're near a large body of water.