It can be caused by either one. In some cases, the issue comes from the building’s internal plumbing system, especially in older apartments or brownstones with aging pipes. In other situations, municipal water infrastructure is responsible, particularly when maintenance work or flushing operations disturb sediment inside water mains. Sometimes both systems contribute at the same time.
Older buildings often have plumbing systems made from galvanized steel or iron, which can corrode over time. As corrosion builds up inside the pipes, rust particles may break loose and enter the water flow. This is more common in historic apartment buildings, prewar housing, and older residential properties where plumbing systems have not been fully replaced or upgraded.
Yes, rust inside pipes is one of the most common reasons for brown or orange water. When iron pipes corrode, they produce rust that accumulates on the inner walls. If water pressure changes or flow is disturbed, these particles can mix with the water and temporarily change its color. While it may look alarming, it is often related to pipe condition rather than contamination.
Brown water should be investigated if it happens repeatedly, lasts for long periods, or is accompanied by other issues such as low water pressure, visible sediment, or unusual taste or smell. If the problem only happens briefly after construction or maintenance work, it may resolve on its own. However, recurring issues may indicate deeper plumbing or infrastructure problems that require inspection.