If we know the max. pressure (p) is 2.5 MPa and T = 20 C.
Peak intensity, I = p^2 / rho * c
where rho = density of water: 0.9982E03 kg/m^3 and c = speed of sound in water: 1482.3 m/s at 20 C
I = (2.5E06 [Pa])^2 / 1.4796E06 [kg/m^2/s] = 4.2241E06 W/m^2
Is this correct?