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SafetyApril 11, 2026·6 min read
Boil Water Advisory: What to Do, What to Avoid, and How Long It Lasts
Microbiological outbreaks trigger boil notices. Here is the safe playbook — including why you should not use home RO during a boil advisory.
WC
By WaterCheckup · Editorial · NSF/WQA-aligned guidanceIs your water affected?
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A boil water advisory usually means the utility suspects or confirms microbial contamination — or a loss of pressure that can let contaminated water into the system.
Do this: Bring water to a rolling boil for at least one minute (three minutes at high altitude per CDC guidance) for drinking, brushing teeth, washing produce, and making ice. Use bottled water if instructed.
What to avoid
Do not assume your refrigerator filter, pitcher, or shower filter removes bacteria. Home RO systems are not typically certified as microbiological purifiers for boil notices — follow utility guidance.
After it lifts
Flush taps as directed. Replace filters if your utility or manufacturer recommends it after contamination events.
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