Sump Pump and Foundation Underdrain Problems in Colorado Springs

Updated October 10, 2026 · 5 min read

How the system works

Expansive clay soils and seasonal groundwater are common in the region, so builders put a perforated drain pipe in gravel around the bottom of many foundations. That foundation drain collects water before it can press against the walls and floor. The water has to go somewhere, and in the Colorado Springs area it usually goes one of two ways.

Sump pit and pump

The foundation drain empties into a pit in the basement floor, often in a mechanical room or under a lid in a closet. When the water rises, a float switch turns on a pump that pushes it up a discharge pipe and out of the house.

Gravity underdrain

In many subdivisions, the foundation drain on each lot connects to a shared underdrain pipe that runs under the street and carries groundwater away by gravity. No pump is involved for the homeowner. Communities like Gold Hill Mesa and Falcon Highlands have metro districts responsible for maintaining their underdrains, and homeowners there are told to report problems rather than work on the line themselves. Some homes have both an underdrain connection and a sump as a backup.

If you are not sure which you have, look for a pit with a lid in the basement floor. Your plat notes, HOA documents or metro district can tell you about an underdrain.

Simple sump checks

Do these a couple of times a year, especially before spring snowmelt and before monsoon season.

1. Look in the pit. Clear out gravel, sediment and debris. Make sure nothing can jam the float.
2. Test the float. Slowly pour a bucket of water into the pit. The pump should start, empty the pit and shut off on its own.
3. Listen. A smooth hum is normal. Grinding or rattling, or a hum with no water moving, means trouble.
4. Check the check valve. After the pump shuts off, water should not flow back into the pit from the discharge pipe.
5. Go outside. Find where the discharge comes out. It should be clear, unfrozen and pointed away from the house, onto ground that drains away.
6. Check the plug. The pump should be plugged into a working GFCI outlet, ideally one not shared with other appliances.

Winter discharge problems

A discharge line that runs across the yard can freeze in a cold snap. When it does, the pump runs against a blocked pipe and the pit can overflow. Some homeowners add a freeze relief fitting near the house so water can escape if the line ices up. Keep snow from piling over the outlet as well.

Where the water must not go

Do not run the sump discharge into a laundry sink, floor drain or cleanout. Those usually connect to the sanitary sewer. Colorado Springs city code lists sump discharges among the kinds of water that need approval before they enter the wastewater system. Also avoid pointing the outlet at a neighbor's yard, a sidewalk that freezes, or right back toward your own foundation.

Backup power

A sump pump is most needed during heavy storms, and those are often the same storms that knock out power. A pump without power is just a pipe in a hole.

Homes on private wells, common in Black Forest and parts of the eastern county, cannot use a water powered backup, since the well pump also needs electricity.

Signs your underdrain is not keeping up

If your home ties into a shared underdrain, you cannot test it like a pump, but you can watch for signs:

• Dampness along the bottom of basement walls after storms, when the basement used to stay dry.
• Water coming up through the slab or around the edges of the floor.
• A sump that runs much more often than it used to, if you have one as backup.
• Neighbors on the same street reporting the same thing.

Report problems to your metro district or HOA in writing, and keep photos with dates. A KRDO report on Falcon Highlands showed how confusing underdrain responsibility can be for homeowners, so it helps to know who maintains yours before you need them. Homeowners in Falcon, Gleneagle and Stetson Hills can usually find this in their community documents.

When the basement floods anyway

Pumps fail. Power goes out. Underdrains clog. If water is on the floor:

1. Do not step in it if outlets, cords or appliances are in the water. Shut power at the panel only if you can reach it from a dry spot.
2. If the pump has stopped, check the breaker and GFCI before assuming it has died.
3. Move what you can off the floor and take photos.
4. Get water out quickly. Finished basements hold water in carpet pad, the bottom of the drywall and the insulation behind it. Our emergency water extraction and basement flooding pages explain what happens on the first visit.

Our post on basement flood cleanup cost factors covers how the source of the water affects the scope, and expansive soil and basement water explains why so many local homes need these drains in the first place.

Insurance and sump failures

Basement water from a failed sump pump or a backed up drain is often excluded from a standard homeowners policy. Many insurers sell a water backup endorsement that covers sump overflow and drain backup up to a set limit. If you have a sump and a finished basement, it is worth a call to your agent to see what your policy says. Groundwater seeping through the walls and surface flooding are treated separately and are usually excluded unless you carry flood insurance.

Sources and official resources

• Contractor license lookup (Pikes Peak Regional Building Department)
• Homeowners insurance help (Colorado Division of Insurance)
• IICRC: restoration industry standards body
• Flood insurance basics (FEMA FloodSmart)
• A Brief Guide to Mold, Moisture and Your Home (EPA)
• Colorado Springs weather warnings (National Weather Service, Pueblo)