Why is my brand new kitchen sink draining so slowly?
New kitchen sinks often drain very slowly even when the pipes are completely clear of physical clogs. This sluggish drainage prevents normal use and leaves standing water in the basin, persisting despite plumbers dismissing the issue as normal operation.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Calling a professional plumber2 people mentionedDid this help you?
- 2Contacting the home builder to claim warranty repairsDid this help you?
- 3Checking for missing vent caps or test balls left in the plumbing systemDid this help you?
- 4Inspecting under the sink for missing p-traps or venting issuesDid this help you?
- 5Using an accordion pipe as a temporary fixDid this help you?
- 6Using a drain snake past the wallDid this help you?
- 7modifying the rubber flange on the garbage disposalDid this help you?
- 8checking the slope of the pipe or trapDid this help you?
- 9adding an automatic air ventDid this help you?
- 10Checking if the cold water supply valve is fully openDid this help you?
- 11Toggling the water supply valves off and onDid this help you?
- 12Watching YouTube tutorial videos on faucet componentsDid this help you?
- 13Removing the garbage disposal entirelyDid this help you?
- 14Installing a shallower sinkDid this help you?
- 15Cutting into the wall to lower the stack connectionDid this help you?
- 16Leaving it alone and monitoring for smells or bugs if used frequentlyDid this help you?
- 17Spinning a vortex with a hand to force it to drainDid this help you?
- 18Pouring a large amount of water inside the basin to clear it smoothlyDid this help you?
- 19Replacing the drain with a pop-up style for better airflowDid this help you?
- 20pulling the p-trap to check for clogsDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“The kitchen sink has never drained correctly in my mind but I don’t know what the issue is exactly.”source ↗
“the water kept creeping up even with no obstructions. Once I turn the water off, the water starts to drain as normal but it’s incredibly slow and much slower than other sinks/drains in the house.”source ↗
“Plumber came by last week and took a look at it, and told me “everything is fine, you just have to make sure you’re not putting water directly in the hole””source ↗
“I have! This was the first thing I did, and I got the reasoning above…”source ↗
“After install, the sink drains much slower than it used to, especially if I'm using soap.”source ↗
“Could someone please tell me if there's a relatively easy way to fix my issue?”source ↗
“How can I fix this? Is it easy or do I need a professional?”source ↗
“Ive checked and it isnt physically clogged, but it drains very slowly which is kinda gross.”source ↗
“Installed a new sink and disposal. Disposal exit is the same height as the drain exit to wall.”source ↗
“Your disposal will always hold water because the trap arm is too high.”source ↗
“The problem is your drain is higher than your disposal.”source ↗
“This will cause disposal failure early due to standing water in it since it's not properly draining.”source ↗
“As of now I’m getting a glug-glug when the sink is on. It just fills the basin then eventually clears.”source ↗
“I never had issues with drainage before only after I switched to a single sink.”source ↗
“It drains fine when I run the faucet, but when I dump a gallon of water, it drain very slowly and flooded the sink”source ↗
“Thank you for the replies but I don't know how to do any of this stuff lol.”source ↗
“I have no idea what any of this means. Is there a YouTube video?”source ↗
“the island sink is not draining properly. It’s very slow to drain and bubbles up.”source ↗
Where this came up
People with this problem also raised
- 7Why is my double kitchen sink draining so slowly?
- 21Why is a newly installed sink drain leaking above the trap?
- 4Why does water flow drop drastically with normal pressure?
- 15Why is water backing up into the sink when appliances drain?
- 3Why does the kitchen sink splash water everywhere?
- 3Is normal plumbing wear in a new home a leak?