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UST rule implementation

Resources to help you implement the new UST regulations

On July 18, 2018, we repealed Chapter 173-360 WAC and adopted new Chapter 173-360A WAC, Underground Storage Tank (UST) Regulations. The new chapter modifies and replaces the repealed chapter. The effective date of the adopted rule was October 1, 2018.

The documents on the page have been created or updated to correspond with the updated language in the WA UST regulation.

Guidance documents on the UST rule changes: