Type of project Institution responsible Description Objective Methodology and assumptions FT 53. Increase in municipal wastewater treatment in WWTP Increase in municipal wastewater treatment in WWTP. CONACUA in coordination with state water commissions, operating agencies and concessionaires. In the base year 2013 in Mexico, the volume of municipal wastewater was 230,235 lps, of which 46% was treated and 54% did not receive treatment, this led to the CH and NO emissions reported in the INEGYCEI (INECC, 2021) as COeq: 3.36 of the treated water and 4.028 MtCOe of the untreated, for a total of 7.38 MtCOe. As of that year, the volume of treated water increased to reach 141,479 lps in 2019, while the volume of untreated water decreased from 124,300 lps in 2013 to 109,001 lps in 2019. Said scenario involves the reduction of CH emissions, and NO per unit volume of treated and untreated water. CONACUA has a sector goal for the year 2030 to achieve the treatment of 100% of municipal wastewater (National Water Commission, 2018). The mitigation is estimated based on the increase in the volumes in the treatment of municipal wastewater collected and the decrease in the untreated volumes disposed of in the sewerage system or other receiving bodies in accordance with the IPCC methodology applied in the INECYCEL results. In the case of treated water, indirect emissions implicit in electricity consumption are subtracted. The calculation of reduced emissions is described below: Emissions from wastewater treatment in municipal WWTPs in relation to the base year 2013 EAQE 2013 FI 2013 = LBQ ER = Qt x FI2013 = LB-EAges = (Q, X FGE) X FE, Elyti Where: FI2013-Carbon intensity factor for municipal wastewater treatment in the base year COCO 2013 EAQt2013- Current scenario municipal wastewater treated in the base year 2013 (GgCO,0) Qt2013- Flow treated in the base year 2013 (m /year) LBQti-Baseline for municipal wastewater treated in the year / [CgCOe]. Qti-Flow treated in year / [m/year) ERQUI- Emissions reduced by municipal wastewater treated in year i [GgCOe]. EA