Part of our guide to Denver storm drain repair and cleaning.
A storm drain backing up in a Denver yard usually means the grate, catch basin, private storm lateral, or outlet cannot move runoff fast enough. Remove visible leaves only when it is safe. If water stays high or returns during the next storm, inspect the line before choosing cleaning or repair.
Private yard catch basins and area drains collect runoff before sending it through a buried line. When that system backs up, the first task is to find where flow stops. Our Denver storm drain services cover cleaning, camera inspection, repair, and replacement for private property systems.
Denver Sewer and Water is a private, family owned and operated company. We are not Denver Water or the City and County of Denver. Property owners should confirm pipe ownership, discharge rules, and permit requirements with the jurisdiction responsible for their address before authorizing work near a public connection.
Why is the storm drain backing up in your yard?
A yard drain backs up when runoff enters faster than the system can carry it away. Wet leaves and sediment may block the grate or basin. Deeper trouble can include roots, compacted debris, a separated joint, a bellied section that holds water, or a collapsed storm lateral.
The timing offers a useful clue. Water that rises only when leaves cover the grate points toward a surface restriction. A basin that remains full long after rain suggests the restriction is below grade. A backup that returns after cleaning may mean the pipe has a structural defect or poor slope.
| Symptom | Likely cause | Typical next step |
|---|---|---|
| Water pools over a leaf-covered grate | Leaves or surface debris restrict the inlet | Remove accessible debris safely and observe drainage |
| Catch basin stays full after the storm | Sediment or a blockage may be inside the basin or lateral | Clean the basin and inspect the buried line |
| Backup returns soon after cleaning | Roots, a separated joint, a belly, or structural damage may remain | Use a camera to locate and document the defect |
| One part of the yard stays wet | A low area, poor grading, or a damaged pipe may retain water | Compare surface drainage with the condition and pitch of the line |
| Soil settles above the route | A leaking, separated, or collapsed section may be washing soil away | Limit traffic over the area and arrange inspection |
What should you do first when a yard drain overflows?
Start by keeping people away from deep or moving water and by stopping any avoidable runoff into the area. If the grate is visible and safe to reach, remove loose leaves from the surface. Do not reach into a flooded basin or open a buried system without knowing what is below.
Checklist for a backed-up yard drain
- Keep children, pets, and vehicles away from pooled water and softened ground
- Photograph the water level, affected area, and visible grate before conditions change
- Remove only loose surface leaves or trash that can be reached without entering the water
- Note whether nearby downspouts, driveway drains, or other basins feed the same system
- Watch whether the basin drains after rainfall stops or remains full
- Avoid forcing rods or unapproved chemicals into an unknown storm line
- Arrange cleaning and camera inspection if the water remains or the backup repeats
- Confirm ownership, discharge rules, and permits with the applicable jurisdiction
When does a backed-up drain need cleaning instead of repair?
Cleaning fits when the basin and pipe are structurally sound but restricted by leaves, sediment, or other movable debris. Storm drain cleanout service should restore a clear flow path and verify where removed material was holding. Repeated blockage at the same point calls for closer inspection.
A yard may also have a surface drainage problem rather than a failed buried line. The comparison between a drain and a slope correction matters, and our guide to French drains versus regrading explains how those solutions address different water patterns. The French drain installation guide covers what changes that scope.
Why should a camera inspection come before excavation?
A camera can show whether the storm lateral is open, rooted, offset, bellied, or collapsed. It also helps locate the problem before digging. That evidence keeps a cleaning problem from becoming an unnecessary excavation and keeps a structural failure from being mistaken for ordinary debris.
The inspection must have usable access and enough flow control to see the pipe. Standing muddy water can obscure the view, so cleaning may come first. The same diagnostic principle applies to sanitary lines, as explained in our sewer camera inspection cost guide, although storm and sanitary systems serve different purposes.
When is storm drain repair the right next step?
Repair is appropriate when inspection finds a defined defect that cleaning cannot correct. A separated joint, root entry point, damaged basin connection, bellied segment, or collapsed pipe may require targeted excavation or a larger replacement. The method depends on access, depth, pipe condition, and the approved discharge path.
A proper storm drain repair plan should identify the failed section, explain why it failed, and describe how flow will be restored. It should also account for utility locating, safe excavation, soil conditions, surface restoration, and any inspection required by the local jurisdiction.
Where does owner responsibility end and city responsibility begin?
Responsibility depends on the property, the drainage system, and the jurisdiction. A private catch basin and its lateral may remain the owner's responsibility until an approved connection point. Public inlets and mains are different assets. Do not assume the boundary from the nearest curb or property line.
Ask the jurisdiction to confirm available records, the accepted discharge point, and permit or inspection requirements. A contractor can document the private system and its condition, but cannot redefine a public agency's ownership boundary. That distinction is important before work approaches a street, alley, easement, or public storm facility.
What should a useful storm drain diagnosis include?
A useful diagnosis connects the visible symptom to a specific restriction or defect. It should identify where water enters, where it should discharge, whether the basin is sound, and what the camera shows inside the lateral. It should separate surface grading concerns from pipe conditions rather than treating every puddle alike.
- The location and condition of each visible inlet or catch basin
- The direction of flow and known discharge point
- The depth and accessible route of the private lateral
- Camera findings with the defect location documented
- Whether cleaning restored flow or exposed structural damage
- The proposed repair area and expected surface restoration
- Jurisdiction questions that still need confirmation before work
Final takeaway
A storm drain backing up in a Denver yard needs diagnosis before excavation. Clear safe surface debris, document the water pattern, and inspect a line that stays full or backs up again. For help locating the defect and planning the right correction, request storm drain repair in Denver.