When your tap water turns brown, follow a safe diagnostic and flushing sequence. Step 1: Ask your neighbors if their water is discolored to check for municipal main flushing or emergency main breaks. Step 2: Go to your lowest household plumbing fixture (such as a basement bathtub or utility sink) and let cold water run steadily for 10 to 15 minutes to flush out loose sediment. Step 3: Check whether brown water appears only on hot taps, which indicates a rusty water heater needing a flush. Step 4: Avoid drinking or showering in discolored water until it runs completely clear. Verification: Inspect the water stream in a clear glass to confirm all sediment has cleared.
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