Usually, your sewage pump has a discharge line that's attached to the sewer or outside of your property. In general, basements have higher humidity than the outside air. If you are building a new home, it is a good idea to check the site plans for drainage. External Sump Pump Installation Montclair: A sump pump can help protect your basement. Perimeter Drain Sump Pump Montclair: The sump pump is a vital part of the basement waterproofing equation. Installation costs can vary, especially in regions that experience a lot of rainfall and humidity. Having a properly installed sump means you can keep the water out and save your floors, walls, and ceilings from getting wet and moldy.