THE SHORT ANSWER
Follow the specific utility or health-department notice. During a boil-water advisory, CDC says to boil tap water even when it has passed through a home filter; a typical household filter does not replace the advisory.
Read the exact type of advisory
A boil-water, do-not-drink and do-not-use notice call for different actions. Find the notice from the utility serving your address and check its start, affected streets and latest update. A social post about another city or another water system may not apply to your home.
If the notice says boil water, use boiled or commercially bottled water for drinking, cooking and brushing teeth as directed. Do not assume that a refrigerator cartridge, countertop pitcher or under-sink unit makes tap water exempt.
Reference: CDC drinking-water advisory overview
Keep filtered water in perspective
CDC explicitly says to boil tap water even after a home filter during a boil-water advisory. A filter’s ordinary certification describes specified reduction claims under test conditions; it is not blanket permission to disregard an emergency instruction.
A chemical-related do-not-drink notice is different: boiling can fail to make the water safe. Read the official instructions rather than applying the boil-water routine to every notice.
After the notice is lifted
Follow the utility’s return-to-use directions for faucets, ice makers and connected appliances. Check your exact filter or RO manufacturer’s instructions for any flushing or cartridge steps. If you cannot identify the equipment, photograph the model label and ask the installer before improvising.
Keep the notice and the manufacturer’s guidance together. That simple record is useful the next time a storm or line break disrupts service.
A PRACTICAL NEXT STEP
Drinking water, explained.
Fresh-tasting water for every glass, pot of coffee, and family recipe.
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