Even if the wastewater is treated somewhere else it is possible that there could be a spill of wastewater if for instance a pipe breaks before the wastewater has left the facility and gotten to the offsite treatment center. In this case, it would be important to have a contingency plan.
Please refer to Guidance under Q6 of the Wastewater Section: https://howtohigg.org/higg-fem/wastewater-2023/
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