Public Users of Public Water Supplies

Note: This information supersedes the "Issuing and Rescinding a Boil Water Advisory" portion of the Cryptosporidium and Water Handbook.

During a Boil Water Advisory

Do not serve or consume:

  • water that has not been disinfected,
  • ice or drinks made with water that has not been disinfected, or
  • raw foods rinsed with water that has not been disinfected.

Discontinue service of equipment with water line connections (e.g., water coolers, automatic ice makers, etc.).

Discard ice made prior to the boil water advisory issuance and discontinue making ice. Use commercially-manufactured ice.

When The Boil Water Advisory is Cancelled

  • Flush pipes and faucets. Run cold water faucets continuously for at least 5 minutes.
  • Flush water coolers. Run coolers with direct water connections for 5 minutes.
  • Flush home automatic ice makers. Make three batches of ice cubes and discard all three batches.
  • Run water softeners through a regeneration cycle.
  • Drain and refill hot water heaters set below 113°F.
  • Change all point-of-entry and point-of-use water filters, including those associated with equipment that uses water.
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