Protecting a basement from Colorado monsoon storms comes down to three things in order: move roof water far from the foundation, keep the ground sloping away from the house, and confirm the sump pump works before you need it. Grading and downspouts prevent far more water intrusion than any pump can remove.
Why summer storms hit harder than the rain total suggests
Two things make late-summer storms disproportionately dangerous for basements. First, intensity: the water arrives faster than soil can absorb it, so most of it becomes surface runoff. Second, the soil itself. Front Range ground that has been dry and hard since June does not take water readily at first, and much of the region's clay soil swells as it finally does wet, pushing against foundation walls. The result is a lot of water moving across the surface, pooling wherever the grade lets it.
Start outside — it is cheaper and it matters more
- Clean the gutters. A roof is a large catchment area. A blocked gutter dumps all of it in one concentrated spot against the wall.
- Extend the downspouts. A splash block at the base of the wall is not enough. Get the discharge several feet out, and further if the soil is heavy clay.
- Check the grade. Stand at each corner and look. The ground should visibly fall away from the house — roughly six inches of drop over the first ten feet. Settled soil against a foundation is extremely common and easy to correct with fill.
- Look at hardscape. Patios, driveways and walkways that have settled toward the house act as funnels.
- Clear window wells. Debris in a well blocks its drain, the well fills, and water comes through the window. Covers are inexpensive.
- Watch where your neighbor's water goes. On a slope, upstream runoff becomes your problem.
Then test the pump — properly
The test most people do is lifting the float by hand to hear the motor run. That confirms the motor turns. It does not confirm the pump moves water, that the check valve holds, or that the discharge line is clear. Do it this way instead:
- Pour five gallons of water slowly into the pit until the float rises on its own.
- Confirm the pump starts, the water level drops quickly, and the pump shuts off cleanly.
- Go outside and confirm water is actually leaving the discharge point.
- Listen after shutoff. A loud clunk is normal; water audibly running back into the pit means the check valve is failing and the pump is re-pumping the same water.
- Look in the pit for gravel, silt and debris that can jam the float or the impeller.
The failures that show up at the worst time
No power. The storm that overwhelms your drainage is often the storm that drops the power line. A pump without a battery backup is unavailable in precisely the conditions it exists for.
A stuck float. The most common mechanical failure, and usually caused by debris in the pit or a pump that has shifted against the wall.
A frozen or blocked discharge. More of a shoulder-season problem, but a discharge line that ends too close to the house or runs uphill at the end will back water up.
Age. Sump pumps are consumables. A pump that has been in the pit for a long time and has never been tested should not be assumed good.
If water does get in
Deal with electricity first: do not walk into standing water in a basement with powered equipment or outlets in it. Once it is safe, the priority is removing water quickly and then drying thoroughly — material left damp behind drywall or under carpet becomes a mold problem that costs more than the original water did. Then find the entry point while the evidence is fresh, because the stain line tells you exactly where it came in.
Where Smith fits
We install, replace and service sump pumps, including battery backup systems, and we handle the emergency calls when something lets go at ten at night. If you have had repeat water and cannot find the source, a camera inspection is worth doing — sometimes what looks like groundwater is actually a failing sewer lateral or a broken drain line. Our sump pump maintenance guide has the full seasonal routine, and this piece covers pre-season prep.
Frequently asked questions
How do I keep my basement dry during heavy Colorado rain?
Work from the outside in. Clean the gutters, extend downspouts several feet from the foundation, make sure the ground slopes away from the house about six inches over the first ten feet, and keep window wells clear. Then confirm the sump pump actually moves water. Exterior drainage prevents far more intrusion than any pump removes.
How do I test a sump pump the right way?
Pour about five gallons of water slowly into the pit until the float rises on its own, rather than lifting the float by hand. Confirm the pump starts, the level drops quickly, water reaches the outdoor discharge point, and the pump shuts off cleanly without water audibly running back into the pit.
Does a sump pump need a battery backup in Colorado?
It is strongly worth having. The severe storms most likely to overwhelm a home's drainage are also the storms most likely to cause a power outage, which leaves a standard pump unavailable at exactly the moment it is needed. A battery backup keeps the pit under control until utility power returns.
Why is water coming into my basement only during big storms?
Intermittent intrusion that tracks heavy rain points to surface water rather than groundwater. The usual culprits are blocked or short downspouts, soil that has settled so it slopes back toward the house, a debris-filled window well, or hardscape that funnels runoff at the foundation — all correctable without excavation.