Sump Pumps & Exterior Drainage

A sump pump is one part of a drainage system, and the guides in this topic work outward from the pit. Size the pump from the water entering the pit and the installed discharge head, not from the maximum flow on the box. Give it a backup on an independent power source, test it, and add a high-water alarm so a failure does not go unnoticed.

More on sump pumps & exterior drainage

The discharge matters as much as the pump. In winter a line freezes when water sits in a cold section of pipe, the outlet is buried, or the pipe has a low spot. In the City of Burlington, the pump must discharge outdoors onto the owner's own property, never into the public sewer, onto a neighbor or into the right of way.

Outside the house, gutters, downspouts, grading, swales, catch basins and French drains each move a different kind of water. The window-well article covers a common weak point, and the fall checklist puts the exterior steps in order while the ground is still workable.

The cost of a sump job is set by what surrounds the pump. Swapping an existing pump into a sound pit with working power and an adequate discharge is a small job. Cutting a new pit through a slab, adding a dedicated circuit, running a discharge to a safe outlet and adding battery backup or an alarm are what move the price, and the installation-cost article breaks those apart.

Window wells are a frequent, overlooked entry point. A well can fill because roof runoff, sloped soil, a low rim, a missing cover, packed sediment or a blocked drain sends water toward the window faster than it can escape. The fix can be raising or replacing the well, correcting grade, extending downspouts or fitting a cover, and the article explains how to tell which.

Do the exterior work in the fall. The fall checklist puts the steps in order while the ground is still workable: extend roof drainage away from the foundation, correct soil that has settled against the wall, clear and cover window wells, confirm the sump discharge will still drain with snow on the ground, then test the pump.

The Burlington rules article is specific to the city but the logic travels. A sump pump has to discharge outdoors, the water has to stay on the owner's property, and the outlet has to keep water from returning to the foundation or freezing across a walkway. Check your own town's rules before you run a discharge line, and read the winter article before you choose where it ends.

The service pages behind this topic cover exterior drainage and grading, French drain installation, window-well drainage and covers, and interior basement drainage. The guides above help you decide which of those is the actual problem before you ask for an estimate.

Read this topic from the pit outward. Start with sizing, backup and alarms, because everything else assumes the pump works. Then read the two discharge articles, freezing and Burlington's rules, which explain where the water goes and what can stop it. The window-well and drainage articles cover the outside water sources, and the fall checklist turns the whole topic into a job list. The installation-cost article is last on purpose: it explains what surrounds a pump and why that, not the pump, sets the price.

Do not wait for a storm to learn what the system does. Lift the float in the pit, listen for the motor and watch the water leave the discharge outlet. Then check the battery backup and the alarm, and note the date. The articles describe why each step matters, and a system tested in spring and fall is much less likely to fail on the night it is needed.

Finally, keep the manuals and the receipts. Note the pump model, the installation date, the battery age and the discharge route on a single page taped near the panel, so that anyone who needs to service the system, including you at two in the morning, can start with the facts.