Why Is There Rust In My Tap Water?
Water from the tap has an unusual orange or reddish tint, especially noticeable in a glass of water or a filled bathtub. This color almost always has an explanation tied to corrosion somewhere in the system.
Where the rust usually comes from
In the vast majority of residential cases, rust comes from internal corrosion of the water heater tank, especially if the unit is nearing or past 10-15 years old. The inside of the tank gradually corrodes over time, releasing rust particles into the water flowing through it.
How to tell the source apart
| Observation | Likely source |
|---|---|
| Rust only from hot water | Water heater, the most common cause |
| Rust from both hot and cold water | Aging galvanized piping in the home |
| Rust only after recent municipal repair work | Municipal water main, usually temporary |
| Rust that shows up only after an extended absence | Stagnant water in aging pipes |
What it means for the water heater
If the rust really is coming from the water heater, it generally indicates advanced tank corrosion, significantly raising the risk of an eventual leak — the tank weakens from the inside before it ever springs a leak. A water heater regularly producing rust is generally nearing end of life rather than having a repairable problem.
Is it safe to drink this water?
Small amounts of rust generally don't pose a serious health risk, but rusty water isn't pleasant to drink and can stain clothing or plumbing. For a property on a well, rusty water still warrants a test to rule out other possible causes tied to the source itself.
What to do
If the rust is coming from the water heater and the unit is past 10-12 years old, replacement is generally the more sensible fix rather than repair. If it's coming from galvanized piping, a gradual replacement with copper or PEX fixes the problem permanently, though it's a bigger project.
Frequently asked questions
How long does a water heater last before it starts rusting?+
Generally 10-15 years, though water quality and maintenance can speed up or slow down this process.
Can rust damage appliances?+
Yes, particularly washing machines and dishwashers, where rust particles can stain laundry or dishes over time.
Does a sediment filter fix the problem?+
It reduces visible particles, but doesn't fix the underlying cause — a corroded water heater will keep degrading until it's replaced.
How do I know if my pipes are galvanized?+
A galvanized pipe generally has a dull gray tint and can be identified with a magnet, which sticks to it unlike copper.
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By Julien Fortin — RBQ-licensed plumber, 10 years of experience in residential plumbing
Updated on July 22, 2026