Plumbers who know how to.
Not sure about other states, but in MA to my knowledge there is no licensing requirement to install a sump pump, so I suppose anyone could. I can tell you from professional experience, It is helpful to know a few things first though. Such as flow rate, and pump “head” pressure, important in calculating
what the pump you install is capable of performing. If you need a Sump Pump or A sump pump system installed in Massachusetts you can contact James N. Zaharias Mechanical Services @ 339-293-2451. Hope this helps.