Shrewsbury sits just east of Worcester across Lake Quinsigamond. Homes near the lake and its brooks can see higher groundwater than houses on higher ground, and in a wet spring that shows up as water seeping in along the floor rather than through a single crack.
That pattern is usually solved with interior drainage and a sump pump rather than sealing the walls, since the water is coming from below. If your house is in a low spot or near water, mention it in your request, along with how quickly the water appears after rain and how long it lingers. Massachusetts requires contractors doing most residential remodeling on owner-occupied homes to be registered as home improvement contractors, so ask for the registration number. Any work that needs a building permit will go through the Town of Shrewsbury, and the contractor should pull it, not you.