The answer to 'hydro jetting making noise' is that a noisy hydro jetting system is often caused by a problem with the equipment or the way it's being operated. Common issues include a clogged or damaged nozzle, a malfunctioning pump, or air in the line. The noise can range from a high-pitched whine to a loud rumbling sound.
If the noise is coming from the nozzle, it may be due to a blockage or worn-out parts. This is usually a relatively simple DIY fix, as you can disassemble the nozzle and clear any debris or replace the worn components. However, if the noise is coming from the pump or other internal components, it's best to call in a professional plumber. Trying to repair these parts yourself could be dangerous and may end up causing more damage.