You turn on the hot water one morning and notice something unusual — the water coming out of the faucet looks slightly brown, orange, or rusty. It can be surprising (and a little alarming), especially if your water normally runs clear. This is a common issue, especially in spring, and there are several underlying factors.
Sediment Buildup in the Water Heater
One of the most common reasons for rusty hot water is sediment buildup inside the water heater tank. Over time, minerals naturally found in water settle to the bottom of the tank. During winter, when hot water demand is often higher due to showers, laundry, and dishwashing, the water heater works harder. That increased activity can stir up sediment that has settled inside the tank.
When the sediment mixes with the hot water, it can temporarily discolor the water.
Corrosion Inside the Tank
Traditional water heaters contain a large metal storage tank with an internal lining designed to protect it from rust. Over time, however, that lining can begin to wear down. If corrosion begins to develop inside the tank, it may cause the hot water to appear rusty.
Water heaters are designed with a sacrificial anode rod that helps prevent this type of corrosion, but those rods eventually wear out. When they do, the tank becomes more vulnerable to rust forming inside.
Temperature Changes During Winter
Cold weather can also play a role. During winter, the temperature of water coming inside your home and pipes is colder than during the rest of the year. When this colder water enters the water heater, it can cause the tank to expand and contract more frequently as it heats up. That movement can loosen mineral deposits or rust particles that were previously settled inside the system. Once those particles enter the water supply, they may cause temporary discoloration.
Plumbing Pipes and Older Homes
Older homes with aging galvanized steel pipes can develop internal corrosion over time. During the winter months, changes in water flow or pressure can dislodge rust particles inside those pipes which may then show up when you turn on the hot water. If discoloration appears only when the hot water is running, the water heater is usually the most probable cause.
When to Call a Professional
If rusty water appears briefly and then clears up after running the tap for a few minutes, it may simply mean sediment has been stirred up. However, if the problem continues or keeps recurring, it’s a good idea to have your water heater inspected. A professional technician can determine whether the tank needs to be flushed, the anode rod replaced, or if the unit is nearing the end of its lifespan.
If your hot water is starting to look funny to you, whether it’s rust-colored or not, and the problem persists, we invite you to contact the home plumbing pros at Blau Sudden Service. With your approval, we’ll figure out what’s causing the problem and recommend the best way to solve it. Call to schedule service at a time convenient for you.