Signs you need basement waterproofing include a white line along the basement wall or on the floor (efflorescence), moisture noted in the basement, wet wall, and puddles of water on the floor that are not coming from any plumbing/etc above. A plumber will need to evaluate water from above a pipe. Water coming over the top of the wall is most likely due to poor grading outside of the home or grading that comes above the foundation wall (this can be evaluated and fixed by a landscaping company).