If a well is used to inject or produce CO₂, it has additional expenses such as corrosion resistant lining and CO 2 -resistant cement. Figure shows the cost of injection and monitoring wells as data points for the Kemper CO 2 storage site in the Southeast USA (Esposito et al., 2019) as well as general CO 2 well cost estimates from EPA (2008; 2010). The genGEO monitoring well relation in Figure is not adjusted for CO₂ use and is a 22 cm diameter water well calculated using Equation S43.