Why would a French drain stop working?

A blocked or buried outlet, sediment or silt in the stone, root intrusion, a crushed or separated pipe, a run that is too flat, or landscaping that changed the yard can all stop flow. Each of those needs a different response. A wet lawn does not identify which one.

My French drain is not working. Does that mean it is clogged?

Not necessarily. Clogged pipe is one possible finding. Sediment in the stone, a damaged outlet, roots, or a system that was never routed correctly can look the same from the lawn. Inspection comes before anyone calls it a clog.

Can you just snake or flush the drain?

Sometimes an accessible pipe can be cleared. Not every clogged French drain can be cleaned. If the stone is packed with sediment, the outlet is gone, or the pipe is crushed, flushing will not restore the system.

How do you decide repair versus a new drain?

If the original trench location and outlet are still right, and the failure is in one section that can be restored, repair may be enough. Replacement is more likely when the layout never had a workable outlet, the drain is too flat, the whole trench is badly silted or damaged, or the yard has changed substantially. That call is made after inspection, not from this page.

The yard is wet in a new spot. Is that the old drain?

It might be. A blocked line can push water out somewhere else along the trench. It might also be a new source, such as a downspout change or a grade change. That is why we look at the whole yard, not only the wet patch.

Is this for an existing drain in the yard?

Yes. This page is about exterior French drains already in the landscape that are no longer moving water the way they used to.

French Drain Repair in Portland, ME | Portland French Drains

French Drain Not Working?

If a French drain that used to move water is backing up, barely flowing, or leaving the same part of the yard wet again, the problem may be a blocked outlet, sediment, root intrusion, damaged pipe, or a system that was never routed correctly.

The yard is wet again where the drain used to help
Little or no water comes from the outlet after rain
Water backs up along the old trench line
The drain worked in the past but has gradually become less effective
A section of pipe or outlet is visibly damaged or buried
Landscaping or grading changed after the drain was installed

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Repair or replacement?

Those are different jobs. Inspection has to come first. A description of a wet yard is not enough to promise either one.

Repair may make sense when

The original trench location is still correct
The outlet is viable
The failure is localized
A section of pipe, outlet, or connection can be restored

Replacement may make more sense when

The original layout never had a workable outlet
The drain is too flat or incorrectly routed
The whole trench is badly silted or damaged
The yard has changed substantially
The system was undersized or poorly located from the start

Cleaning is not assumed. Sediment packed into the stone, a crushed pipe, or a missing outlet are not all fixed the same way. If there is no known drain, this is not a repair — start with Do I need a French drain?.

Why a French drain stops draining

These are the conditions an inspection separates. One wet lawn in Portland, Maine can be any of them. None of them, by itself, proves the line can be cleaned. Homeowner warning signs are also listed on drainage repair signs.

A blocked, buried, or no-longer-downhill outlet
Sediment or silt filling the drainage stone
Root intrusion in a section of pipe
Crushed, separated, or otherwise damaged pipe
A run that is too flat, or that was never routed to a workable outlet
Landscaping, hardscape, or grading changes after the original install

How an existing French drain gets inspected

Inspection starts by finding the existing trench, the pipe, and the outlet, and confirming whether water still has a route and a place to leave.

The next look is for restrictions, visible damage, and changes around the system. That can include a blocked outlet, sediment in the stone, roots, or a damaged section of pipe, along with landscaping or grade changes since the drain was installed.

A localized failure is a different finding from a layout or outlet failure. One damaged section or a covered outlet may be restorable. A run that is too flat, or that never had a workable outlet, will not be restored by clearing a single spot.

After that evaluation, the next step is either restoring what can be repaired or choosing a different drainage approach. Replacement work is French drain installation. If roof water or surface runoff is also feeding the area, yard drainage is the broader look. A pond still sitting on the old line is standing water after rain. Soil that stays soft after the surface looks dry is yard stays wet for days.

When repair is not the first answer

Repair is for a drain that already exists. It is not the first tool for a puddle that never had a trench, a downspout still emptying at the wall, or a yard that was graded toward the wet spot after the drain went in.

Flushing a line without finding the restriction can waste the visit. So can digging a new French drain beside a system that only needed its outlet uncovered. The inspection helps determine whether the existing drain can be restored or whether the yard needs a different drainage approach.

If there is no known drain, the question is whether a French drain belongs at all. That is settled on the lot, not from this page.

What to inspect on an existing drain

A repair visit should treat the old system as evidence, not assume a clog and stop there.

Where the outlet is, and whether water still leaves it after rain
Whether the wet area follows the old trench or has moved
What can be seen of pipe, stone, or fabric at any exposed point
Grade, hardscape, or planting changes since the drain was installed
Downspouts or surface water now feeding the same area
Whether a local repair can restore the line, or the layout itself is the problem

French Drain Repair in Portland, ME