Plumbing Problem? Find the Likely Cause and What to Do Next
Troubleshoot leaking toilets, low water pressure, clogged drains, water heater problems, pipe noises, mystery leaks, and other common plumbing symptoms. Start with what you can see, hear, smell, or notice.
What type of plumbing problem are you having?
Select the symptom that best matches the problem. The tool will route you toward the most relevant troubleshooting guide.
Start With the Symptom
Different plumbing symptoms point toward different causes. Choose the group that best matches what is happening in your home.
Toilet Problems
Leaks, running water, bubbling, rocking, and flushing problems often have different causes and repair paths.
Leaks & Drips
Plumbing leaks can come from supply lines, drains, fixtures, pipes, appliances, or hidden connections inside walls and ceilings.
- Faucet dripping after turned off
- Possible pipe leak inside wall
- Water under sink
- Ceiling leaking below bathroom
Water Pressure
Low or inconsistent pressure may involve fixtures, valves, supply lines, pressure regulators, mineral buildup, or municipal supply.
Drains & Backups
Slow drains, gurgling, odors, and multiple fixture backups can help distinguish a local clog from a larger drain or sewer issue.
- Sink draining slowly
- Shower drain slow
- Toilet backing up into shower
- Multiple drains clogged
Water Heater Problems
No hot water, leaks, unusual sounds, fast heat loss, and rusty water can point toward different water-heater components or replacement decisions.
Pipe Noises
Banging, knocking, squealing, humming, and vibration can reveal pressure, valve, mounting, or water-flow problems.
- Pipes bang when water turns off
- Faucet squeals when turned on
- Pipes humming
- Pipes vibrating
What Is the Plumbing System Telling You?
The timing, location, sound, and number of fixtures affected can narrow down a plumbing problem before you start replacing parts.
One slow sink is a different diagnostic problem from every drain in the house backing up at the same time.
Diagnose My Plumbing ProblemHow Urgent Is the Problem?
Minor Fixture Issue
A slowly dripping faucet, simple running toilet, or minor pressure issue may be reasonable to troubleshoot before calling a plumber.
Recurring Leak or Drain Problem
Repeated leaks, slow drains, pressure changes, or water-heater symptoms should generally be diagnosed before they cause additional damage.
Active Leak, Sewage or Major Backup
Significant water flow, sewage backup, rapidly spreading moisture, or plumbing affecting electrical equipment can require immediate professional attention.
Which Plumbing Problems May Be DIY-Friendly?
Simple Fixture Repairs
- Replacing some toilet flappers
- Simple faucet aerator cleaning
- Basic drain trap cleaning
- Replacing some shower heads
Cause Is Not Obvious
- Low water pressure
- Ceiling leak below bathroom
- Recurring drain clogs
- Water-heater noises
Higher-Risk Problems
- Major active leak
- Sewage backup
- Hidden pipe leak
- Damaged main water line
- Complex water-heater issues
Who Should You Call?
Plumbing symptoms can sometimes involve appliances, water damage, HVAC systems, or sewer service rather than a traditional fixture repair.
| Problem | Likely Starting Point |
|---|---|
| Toilet leaking from base | Plumber |
| Water heater leaking | Plumber or qualified water-heater technician |
| Dishwasher leaking underneath | Appliance repair technician or plumber |
| Ceiling leak below bathroom | Plumber |
| Multiple drains backing up | Plumber or drain/sewer specialist |
| Water appearing near HVAC equipment | HVAC technician |
Plumbing Problems Can Cause Problems Elsewhere
A plumbing failure may first show up as a water stain, appliance leak, damaged drywall, or moisture problem somewhere else in the home.
Water Damage
Appliances
- Dishwasher leaking underneath
- Washing machine leaking underneath
- Refrigerator leaking water
Home Repair
- Home Repair Problem Finder
- HVAC Problems
- Electrical Problems
Common Plumbing Searches
What Might the Repair Cost?
Plumbing costs can vary widely based on the cause, access, location, required parts, and whether hidden water damage is involved.
Individual problem pages should eventually show typical DIY material costs, professional repair ranges, and whether replacement may be more economical.
Typical Decision Factors
- Is the leak visible or hidden?
- Does drywall or flooring need removal?
- Is the repair limited to one fixture?
- Are supply or drain lines involved?
- Does the system require replacement?
- Is emergency service required?
Limit Damage While You Diagnose the Problem
A few safe actions can reduce water damage while you determine what is causing the plumbing problem.
- Know where your home’s main water shutoff valve is located.
- Shut off the local fixture supply when an active fixture leak is clearly identified.
- Move belongings away from active water when safe.
- Avoid using fixtures that trigger a leak or backup.
- Photograph visible leaks and damage before cleanup.
- Avoid electrical equipment or outlets exposed to water.
Not Sure What Your Plumbing Problem Is?
Start with the symptom. Tell us where the problem is and what happens when you use the plumbing system, and we’ll point you toward the most relevant guide.
Diagnose My Plumbing ProblemMore plumbing diagnostic tools
- Water Heater Leaking From Bottom
- Low Hot Water Pressure Only
- Pipes Bang When Water Turns Off
- Toilet Leaking When Flushed
- Water Heater Has No Hot Water
- Shower Water Pressure Suddenly Low
- Rusty Hot Water
- Pipe Leaking Inside a Wall
- Toilet Bubbling or Gurgling
- Toilet Rocking on the Floor
- Water Pressure Drops When Two Faucets Run
- Multiple Drains Clogged at Once