No amount of rust in your home's drinking or bathing water is considered ideal or desirable. While trace amounts of harmless iron sediment may occasionally appear in old municipal or well systems, discolored reddish-brown or rusty hot water typically indicates advanced internal corrosion inside your water heater tank or deteriorating galvanized supply pipes. Ingesting or bathing in rust-stained water can cause skin irritation, stain laundry, and signal that your water heater is nearing structural failure. Verification: Flush your water heater tank; if rusty water persists, the tank interior is severely rusted and requires replacement.
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