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Fix a dry well that backs up

We'll confirm the backup, check the inlet and well, flush sediment, and restore capacity—or tell you when to call a drainage professional.

Troubleshooting · Home maintenance
30–90 min
What you'll need
  • Hose (high pressure)
  • Bucket or wet-dry vacuum (if the well has a lid)
  • Drain snake (if the inlet pipe is clogged)
Step 1 of 7

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Steps

Goal: Confirm the dry well backs up, clear the inlet and well chamber, and restore capacity.

  • Check during or after rain. Water pools at the dry well or backs up from the inlet pipe.
  • Good: Water backs up at the well—proceed to Check inlet.
  • Bad: Backup at the source (gutter, French drain)—see fix-french-drain-is-clogged or fix-gutter-is-clogged.

Check inlet

Goal: Clear blockage at the inlet so water can enter the well.

  • Check where the pipe enters the well. Clear debris and sediment. Run a hose from the source (gutter, downspout, French drain) at full pressure. Water should flow into the well.
  • Good: Inlet clear. Proceed to Clean well chamber.
  • Bad: Inlet pipe clogged—snake it if you have access. If the well is buried with no access, call a drainage professional.

Clean well chamber

Goal: Remove sediment from the well chamber if accessible to restore capacity.

  • If the well has a removable lid, open it. Remove sediment from the bottom with a bucket or wet-dry vacuum. Do not enter the well.
  • Run water through the inlet. Water should absorb into the soil. If water fills and stays high, the soil may be saturated or the well undersized.
  • Good: Water absorbs. No backup during rain.
  • Bad: Well is buried with no access, or cleaning did not restore capacity—call a drainage professional.

When to get help

Call a drainage professional if:

  • The well is buried with no access.
  • The well has collapsed or shifted.
  • Flushing and cleaning did not restore capacity.
  • You need a new or larger dry well.

Verification

  • Water flows through the inlet into the well without backing up.
  • Water absorbs into the soil within a few minutes when you run a hose.
  • No pooling at the well during or after rain.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm backup Verify water pools at the well or backs up from the inlet.
  2. Check inlet Clear blockage at the inlet; flush the pipe.
  3. Clean well chamber If accessible, remove sediment from the well.
  4. Call a pro Well buried, collapsed, or flushing did not work—call a drainage professional.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Inlet condition (blocked or clear)
  • Whether the well chamber is accessible
  • Flow after flushing
  • Steps already tried

Does the dry well back up?

Water pools at the well or backs up from the inlet during or after rain.

Check during or after rain. Backs up: water pools at the well or backs up from the inlet. Clear: if water still pools, the source (gutter, French drain) may be clogged—see fix-french-drain-is-clogged or fix-gutter-is-clogged. Good: well backs up—proceed. Bad: backup at source—check upstream.

Yes No

You can change your answer later.

Is the inlet pipe blocked?

Debris or sediment can block where the pipe enters the well.

Check the dry well inlet pipe. Blocked: clear debris. Flush from the source with a hose. Clear: check if the well chamber is full of sediment. Inaccessible: call a drainage professional.

Yes No

You can change your answer later.

Clear inlet and flush

Clear the inlet. Run a hose from the source (gutter, downspout, French drain) at full pressure. Water should flow into the well. If the well has a lid, remove sediment from the chamber. Test—water should absorb. If not, call a drainage professional.

Done

Is the well chamber accessible?

Some dry wells have a removable lid. Sediment in the chamber reduces capacity.

If the well has a lid, open it. Remove sediment with a bucket or wet-dry vacuum. If the well is buried with no access, call a drainage professional. Accessible: clean and test. Not accessible: call a pro.

Yes No

You can change your answer later.

Clean the well chamber

Remove sediment from the dry well chamber. Run water through the inlet. Water should absorb into the soil. If water still backs up, the well may be undersized or the soil saturated—call a drainage professional.

Done

Call a drainage professional

Call a drainage professional if: the well is buried with no access, the well has collapsed, flushing did not restore capacity, or you need a new or larger dry well.

Done

Check upstream source

The backup may be upstream. If the drain connects to a French drain, see fix-french-drain-is-clogged. If it connects to a gutter or downspout, see fix-gutter-is-clogged or fix-downspout-overflows.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a dry well back up?
Sediment fills the well over time and reduces capacity. The inlet pipe can clog. The well can collapse or shift. If the soil is saturated, the well cannot absorb more water. Heavy rain can overwhelm the well.
Can I fix a backing-up dry well myself?
Yes, for accessible wells. Check and clear the inlet pipe. If the well has a lid, remove sediment from the chamber. Flush with a hose. For buried wells with no access, or if the well has collapsed, call a drainage professional.
When should I call a drainage professional?
Call a drainage professional if: the well is buried with no access, the well has collapsed or shifted, flushing did not restore capacity, or you need to install a new or larger dry well.

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