LGOP Wastewater Treatment Facilities

Local governments are often responsible for providing wastewater services to their communities, such as collection, septic system management, primary and secondary treatment, solids handling and effluent discharge. This section focuses only on calculating the fugitive and process CH4 and N2O emissions from septic systems and centralized wastewater treatment (WWT) facilities only. Other sections of the LGOP Protocol should be used to calculate emissions from other activities related to wastewater treatment (e.g., electricity use, stationary combustion, and vehicle fleet).

This protocol applies to local governments that have operational or financial control over a septic system or WWT facility. Local governments served by regional WWT plants have the option of quantifying these emissions and reporting them as Scope 3 emissions. 

Chapter 10 of the LGOP provides guidance on calculating emissions from WWT facilities:

CH4 emissions estimations:

Stationary emissions from incomplete combustion of digester gas.

Process emissions from WWT lagoons.

Fugitive emissions from septic systems.

N2O emissions estimations:

Process emissions from WWT plant with nitrification/denitrification.

Process emissions from WWT plants without nitrification/denitrification.

Process emissions from effluent discharge.