Check the laundry standpipe
Annual · typically September
Why it matters
The laundry standpipe — that open vertical pipe the washer's drain hose hooks into — is the most abused drain in the house. It takes the biggest surges, catches all the lint your dryer's screen never sees, and binds it together with soap scum into a felt that narrows the pipe year over year. The flood it eventually causes is famous for getting the wrong appliance blamed: the "washing machine leak" that was never the machine.
What skipping it costs
$400–$5,000
A washer drains 15–25 gallons in a couple of minutes — the highest-volume dump any household drain takes. A standpipe half-closed with lint and soap scum takes it fine, right up until the week it doesn't, and then the laundry room floods with the machine running innocently in place. Everyone blames the washer; the pipe did it.
Two ways to get it done
Do it yourself
You'll need: Flashlight, Zip ties, Mesh lint trap for the drain hose (~$5 for a multi-pack).
- Fit a mesh lint trap over the end of the drain hose (they slide on and zip-tie in place). Replace it when it's half-full — that fuzz is what's been felting your pipe. Five dollars, once or twice a year.
- Check the hose seating: the drain hose should hook into the standpipe loosely, going down no more than about 8 inches, with air space around it. Jammed in airtight, a clog can siphon dirty water _back_ into the machine. Loose with a gap is correct, not sloppy.
- Height sanity check: the standpipe rim should sit roughly 30–48 inches off the floor — above the washer's water level. If yours is oddly short and the machine has a history of mystery puddles, you've found the mystery.
- The overflow test: run a drain/spin cycle and stand there with a flashlight. Water should drop away rapid and quiet. Rising toward the rim, gurgling, or burping at a nearby sink = the pipe is narrowing — snake it now, on your schedule.
- Secure the hose with a zip tie to the supply hoses or the pipe so a strong spin cycle can't buck it out — a hose on the floor drains the whole load onto it.
Hire it out
$150–$300National fair range — local labor moves this number.
A standpipe-and-branch snaking runs $150–$300 and is the right buy when the overflow test fails or the laundry has flooded once already — lint felt is sticky, and the machine auger reaches the branch line where the buildup actually lives. Have them confirm the air gap and hose depth while it's all apart; a good tech treats that as part of the job.
Keep the diagnosis honest: strong pump + slow pipe = drain problem; weak dribble from the hose into a bucket = machine problem (that's your washer deep-clean card's territory, or its drain pump). Anyone selling appliances or whole-house jetting off one lint clog is solving their quarter, not your laundry.
Ask the tech
- Did you snake the standpipe itself or the branch line beyond it? How far down was the buildup?
- Is the drain hose seated with an air gap, or was it jammed in airtight?
- Anything about the trap or venting here that explains repeat trouble?
Red flags you're being upsold
- A new-washer suggestion for what is a drain problem. If the machine pumps strong into a bucket, the machine is fine.
- Whole-house jetting quoted off one laundry backup — the standpipe is one branch, and lint clogs are famously local.
- Ignoring the air gap: any 'fix' that seals the hose into the pipe guarantees the next backup gets siphoned right back into your machine.
Second opinion time: Any laundry-drain quote over $600.
The call
DIY the lint sock and the look — five dollars of mesh prevents the classic laundry flood. Hire the snake if the overflow test fails.