is it safe/practical to control this 30A+ motor with mosfet?
Yes, those transistors could be used to control your water pumps.  But it's probably going to be a lot of work.
The problem is that while the Vds is rated to 600V, the Vgs is only rated to 30V max.  So, you're going to have some fairly complex drive circuitry to make that work.  And your load is both inductive and beefy--so heat sinking is going to be required.
The other solid-state way of dealing with AC switching like this is called a Triac.  Those might be more cost effective and possibly easier to deal with.
However, you're probably going to be better off getting something like a Crydom D2450 Solid State Switch.  http://www.crydom.com/en/products/panel-mount/perfect-fit/ac-output/series-1/d2450/
Those are about $40 each and Crydom already did the nasty engineering work to deal with mains voltages.
Or, you could just get a relay for $10 (about the price of your original transistor):
https://www.digikey.com/en/products/detail/panasonic-electric-works/ADJH22005/7537064
Good luck.