Last reviewed on 06-22-2018

Documentation of California's Greenhouse Gas Inventory (11th Edition - Last updated on 11-06-2019)

♦ Category: Waste

IPCC: 4D1 - Wastewater Treatment and Discharge - Domestic Wastewater Treatment and Discharge
Sector: Industrial : Wastewater Treatment : Domestic Wastewater : Plant Emissions

♦ Activity: California population -

♦ Greenhouse gas: Nitrous oxide ( N2O )

► Year 2014 —

● Greenhouse gas emission estimate —

Amount: 141.26 tonnes of N2O Emitted (42,097 tonnes CO2 Eq.)
Basis: Calculation
Calculation: (([CA Population served by biological denitrification] * [Emission factor with nitrification denitrification]) + (([California Population] * [Fraction using wastewater treatment plants]) - [CA Population served by biological denitrification])* [Emission factor w/o nitrification denitrification]) * [Industrial and commercial codischarge factor]
Reference: USEPA (2015). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2013. U.S. Environmental Protection Agency. Chapter 7: Waste. http://www.epa.gov/climatechange/emissions/usinventoryreport.html

● Activity level used in calculations —

Activity: California population = 38,739,800 person
Basis: Data
Reference: CDOF (2016). State of California, Department of Finance, E-6 Population Estimates for Cities, Counties and the State, with 2010 Benchmark. Sacramento, California. Accessed January 2016. http://www.dof.ca.gov/research/demographic/reports/view.php

● Parameters and Constants used in calculations —

Parameter: CA population served by biological denitrification = 379,025 Person
Reference: DATA NOT AVAILABLE - Values were extrapolated from years for which data were available.
Parameter: Emission factor w/o nitrification denitrification = 3.2 g / person
Reference: USEPA (2015). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2013. U.S. Environmental Protection Agency. Chapter 7: Waste. http://www.epa.gov/climatechange/emissions/usinventoryreport.html
Parameter: Emission factor with nitrification denitrification = 7 g / person
Reference: USEPA (2015). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2013. U.S. Environmental Protection Agency. Chapter 7: Waste. http://www.epa.gov/climatechange/emissions/usinventoryreport.html
Parameter: Fraction using wastewater treatment plants = 0.9
Reference: CWTRC, (2003). Status Report: Onsite Wastewater Treatment Systems in California. Jointly presented by: California Wastewater Training & Research Center, California State University Chico and USEPA Region 9 Ground Water Office. August 2003. http://www.csuchico.edu/cwtrc/Pages/InfoandReoprtspage.htm
Parameter: Industrial and commercial codischarge factor = 1.25
Reference: USEPA (2015). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2013. U.S. Environmental Protection Agency. Chapter 7: Waste. http://www.epa.gov/climatechange/emissions/usinventoryreport.html
Constant: Global warming potential of N2O = 298
Reference: IPCC (2007). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Solomon S., Qin D., Manning M., Chen Z., Marquis M., Averyt K.B., Tignor M., and Miller H.L. (eds.). http://www.ipcc.ch/publications_and_data/publications_ipcc_fourth_assessment_report_synthesis_report.htm

● Greenhouse gas emitted per unit activity (derived from values listed above) —

Amount: 3.65 g of N2O per person
1,087 g (i.e. 1.09 kg) of CO2eq. per person
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