High Groundwater Level – Controlling Water Seepage
If the seepage is minor, generally it can be controlled by sealing cracks and open joints with a hydraulic cement and coating any porous areas of the slab with a cement-base or epoxy sealant. Still, lowering the level of the water below the floor slab would be a better solution. You can achieve this by installing a sump pump below the slab so subsurface water will flow into the sump pit. The water is then removed by the pump and discharged into a storm drain or at a point far enough from the house so as not to be absorbed by the ground and flow back under the basement floor slab. 
Depending on the quality of the floor slab construction, a single sump pump might or might not be adequate to lower the level of subsurface water. In areas with a seasonal high water table , a concrete floor slab should be installed over a gravel base so that water that accumulates below the slab can flow through the voids between the gravel and drain away or flow into a sump pit.
Unfortunately, in many houses the floor slab has been installed directly over soil or over an inadequate gravel bed, with poor drainage characteristics. The water in the saturated area below the slab will not readily flow into a sump pit and will require installing a series of perforated drainpipes below the flow slab that terminate in the sump pit to control the water buildup. Note that with some slow-draining soils such as silts and clays, some soil can wash out from around the foundation footing and result in unequal settlement, which could crack the walls. Have a professional determine whether a sump pump or drainpipes are needed below the floor slab.
If the area you live in has a high incidence of power failures, make sure you don’t depend solely on an electrically driven sup pump to control groundwater seepage because the power might be knocked out when the water level below the floor slab is rising. The best thing to do is to have backup system, such as an auxiliary backup sump pump in the sump pit. A popular type of backup pump is a water-actuated (non-electrical) ejector pump, connected to the house water supply and activated by a float control. On the other hand, this pump will not be effective if the house is supplied by an electrically driven well pump.
If you install a water-actuated sump pump, make sure you include a backflow preventer on the water supply to eliminate the potential for contamination as a result of the cross connection. Another popular and very effective type of backup system is a battery-operated sump pump, which will take over automatically when the power fails, to protect against flood damage.