When you replace a toilet, install a low-consumption model or a water saver. Standard toilets use 5 to 7 gallons per flush; "water-savers" use 3 to 4 gallons per flush; and new low-consumption models use 1.6 gallons, or less per flush. Until you replace your toilet, put a plastic bottle filled with water in the tank to cut down on water needed for a flush.
Sump pits are intended to collect water from foundation perimeter drains. If there is a pump installed in the pit and no water is collecting in the pit, be sure to check the pump to be sure it is working. The easiest way to test your pump is to fill the sump pit to the point it will activate the pump, if the pump does not work replace it.