City of St. Louis

Water Division
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What is the difference between a “Boil Water Advisory” and a “Boil Water Order”?

Question:  What is the difference between a “Boil Water Advisory” and a “Boil Water Order”?

Answer:  A precautionary notice is issued when there is the potential for contamination whereas a mandatory notice (an “order”) is issued when there is known contamination of the water supply.

Now you know.