When discolored or brown water is isolated exclusively to a single bathroom while all other faucets in the house run completely clear, the contamination source is localized entirely to that room's branch lines or fixtures. Common causes include heavy mineral scale and rust accumulation inside that specific bathroom's supply pipes, a rusting toilet tank or flushing mechanism, or debris trapped behind the single-handle mixing cartridge of that specific sink or shower. Because the rest of your home's plumbing network delivers clean water, municipal mains and main water heaters are operating normally. Verification: Remove the faucet aerator and check the water stream directly from the valve body to isolate the restriction.
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