How Much Water Can a Burst Pipe Release per Hour?

The amount of water a burst pipe releases per hour depends mostly on the pipe's diameter and the water pressure in your home's plumbing. A small 1/2-inch pipe with standard household pressure of around 40 psi can release roughly 50 gallons per hour. That is enough to fill a standard bathtub in about a quarter of an hour.

A 3/4-inch pipe can push out nearly twice that amount, around 100 gallons per hour. A 1-inch pipe, often used for main supply lines, can spill 200 gallons or more in the same time. If the pressure is higher, such as near a water heater or in a multi-story home, the flow increases further.

• 1/2-inch pipe: about 50 gallons per hour
• 3/4-inch pipe: about 100 gallons per hour
• 1-inch pipe: 200 gallons or more per hour
• Higher pressure raises these numbers
• A pinhole leak is much slower than a full burst

To get a rough idea of how much water you are dealing with, you can time how long it takes to fill a bucket. Place a 5-gallon bucket under the leak and use a stopwatch. If it fills in 10 seconds, that is about 1,800 gallons per hour, which is a major rupture.

If the leak is small, the bucket might take several minutes to fill. That still adds up over a day. Even a slow drip of 1 gallon per minute amounts to 60 gallons per hour, which can soak drywall, flooring, and furniture before you notice.

If the burst pipe has soaked carpets, drywall, or ceilings, professional help is often needed to prevent mold and structural issues. Local water damage pros have equipment to extract water from floors and walls, and they can dry out hidden spaces. They can also inspect for damage that you might miss.

For a burst pipe, you might need services like emergency water extraction, water damage inspection, or drywall repair. The cost varies depending on the extent of the damage, the size of the affected area, and how quickly you respond. Policies vary, and your insurer decides what is covered.