French drain repair
Does my French drain need repair or replacement?
It depends on what failed: an obstructed outlet or a damaged accessible section may justify a targeted repair; a collector without a workable water route needs its design reassessed. As of Nov 2026, inspect the collection area, pipe route and outlet before agreeing to replacement. Wet grass alone does not identify a broken pipe.
Evidence: NDS; Northern Virginia Soil and Water Conservation District / Fairfax County. Researched Nov 2, 2026; original rate-source dates are listed below.
Ask what the inspection actually found
Ask for a located fault, photographs and pipe observations. “The drain is old” does not distinguish debris, a disconnected fitting, changed grading or a backed-up outlet.
The existing French drain failure guide covers whether this system fits the water problem. Use this page once there is an installed system and a repair proposal to judge. A new water source may call for a different intervention.
Separate a repairable defect from a route problem
| Finding to verify | Potential scope | Evidence to request |
|---|---|---|
| Visible outlet obstruction | Remove accessible blockage and check discharge | Photographs before and after; outlet observation. |
| Localized pipe or fitting damage | Expose and replace the affected component | Identified location, product and connection details. |
| Water cannot reach the collector | Reassess collection placement or surface route | Observed water path and proposed interception point. |
| Discharge point cannot accept water | Reassess the receiving route | Elevation and receiving-area assessment, not another pipe sale. |
Repair the identified part without hiding the rest
NDS’s manual describes product-specific assemblies, outlets and local requirements. It does not prescribe a universal patching or flushing method for an unidentified buried system.
Confirm the existing pipe and collection assembly before specifying a replacement section. The quote should state how new and old components join and how disturbed soil or paving will be restored. A repair that leaves an inaccessible connection undocumented makes the next fault harder to locate.
Compare repair and replacement on the same scope
Separate diagnosis, access, excavation, pipe work and restoration. Even a small patch beneath paving can require substantial reinstatement; compare completed scopes rather than headline prices.
This calculator has installation rates, not a measured repair-rate schedule. Use the installation cost guide for replacement context, and the contractor-selection guide to request a written repair scope. Do not present a new-installation estimate as a repair quote.
Clear accessible surface debris and record symptoms. Unknown utilities or unstable excavation need assessment. Require documentation that water reaches the intended outlet after repair.
Frequently asked questions
Does a wet yard prove the drain pipe is broken?
No. Water may be entering elsewhere, missing the collector or backing up at the discharge point. Ask for a located defect before approving a pipe repair.
Should every failed French drain be replaced?
No. A verified local defect may support a targeted repair. A route or collection-design problem needs reassessment rather than an automatic full replacement.
Can I use the calculator to price cleaning or repair?
The calculator models installation components. It does not contain measured cleaning or repair rates; obtain an itemized proposal for that work.
What should I keep after the repair?
Keep the marked route, repaired location, product details and photographs before burial. Record what the contractor checked at the outlet.
Sources
- NDS: EZflow Drainage Systems Design and Installation Manual. Accessed Nov 2, 2026.
- Northern Virginia Soil and Water Conservation District / Fairfax County: Wet Yard — Solving Drainage Problems. Accessed Nov 2, 2026.
Source scope and rate limitations: drainage sources and methodology.