Short answer: If water is spreading in a condo or apartment, shut off the unit's water valve (and the water heater if it is the source), tell management or your association right away, move belongings and take photos and video before cleaning up. A plumber can find the true source, which often decides who is responsible. Your lease or association documents decide who pays; a renter's policy may cover belongings damaged by a neighbor's leak, so ask your insurer.

Why stacked housing is different
In a building where units sit above and beside each other, water does not stay put. A failed supply line, toilet seal or shower pan upstairs can show up as a stain or a drip downstairs. The person who sees the damage is often not the person whose plumbing caused it, so finding the true source quickly limits damage and helps settle responsibility.
Shared drain stacks add another twist. Kitchen drains from several units can feed the same vertical stack, so grease from one unit can slow the line for everyone below, and a backup can show up first in the lowest unit.
If water is spreading: the first 10 minutes
- Shut off your unit's water valve. It may be in a closet, behind an access panel or at the water heater.
- Turn off the water heater if it is the source: breaker off for electric, pilot or gas control off for gas.
- Call management or maintenance right away, and your association if you own. If it is after hours, use the emergency maintenance line.
- Move belongings and electronics out of the wet area.
- Call a plumber if the leak is not stopped. See emergency plumbing.
Document before you clean up
- Photos and video of the wet areas, the source if visible, and damaged items
- The time you noticed it and when you shut the water off
- Names of anyone you spoke to at management or the association
- Written notice to management or the association, even if you phoned first
- A plumber's written note on where the leak started and what was repaired, plus the invoice
Moisture readings and a plumber's inspection help show where water started, which matters to owners, the association and insurers. Our leak detection page explains how a source is found without opening more wall than necessary.
A real person answers 24 hours a day and tells you what to do first, before anyone comes out.
Who handles what
- Renters: your lease and property manager decide who calls the plumber. Report problems in writing, and for an active leak, shut off the water if you can and tell management right away.
- Owners: your association documents decide which pipes are common elements and which belong to the unit owner.
- Public system problems: for concerns with the public water and sewer system, Cobb County Water System Emergency Dispatch is 770-419-6201. For a leak inside a building, start with management and a plumber.
Cobb County says property owners are responsible for repairs outside the public water system, including internal plumbing. Our who fixes what guide explains the split.
Prevent the next one
- Find your unit shutoff on move-in day, and make sure everyone in the home knows where it is.
- Keep grease out of the sink, since shared stacks clog for everyone.
- Use strainers in showers and kitchen sinks.
- Check under sinks monthly for drips and swollen cabinet floors.
- Replace rubber washing machine hoses with braided stainless ones.
- Consider leak sensors. See our guide on leak sensors and shutoff valves.
- Know your water heater's age. Angi gives 8 to 12 years for a tank heater.
The EPA says the average household's leaks can waste nearly 10,000 gallons of water a year, so even small drips are worth fixing.
A word on insurance
Ask your insurer what a policy covers before you need it. A renter's policy may cover your belongings if a neighbor's leak damages them, and an owner's policy may respond to damage inside the unit. What is covered depends on the policy, so call your insurer or agent after a leak and ask what documents they need. This is general information, not insurance advice.
Game days and plumbing access
Traffic near The Battery on game and event days is real. If you need a plumber, tell us about parking, building access and the best time, and we will plan the route around it. See our Cumberland and The Battery page for more.

Water heaters in townhome closets