Identify Essential Functions for Onsite Sewage Systems (OSS) and Large OSS (LOSS) Operation [open pdf - 235KB]
From the Document: "The failure of an onsite sewage system is a serious health threat to the residents near it. This document names essential activities that go along with responding to onsite sewage system failures, repairs, and upkeep."
Washington State Department of Health. Posted here with permission. Documents are for personal use only and not for commercial profit.
Washington State Department of Health: https://www.doh.wa.gov/