This study was carried out to identify and compare the efficiency levels of maize growers using surface water irrigation (SWI) and groundwater irrigation (GWI) in Khyber Pakhtunkhwa, Pakistan. The variance inflation factor and Koenker Bassett test were used to check multicollinearity and heteroscedasticity that mostly occur in the primary data. The empirical findings obtained from the stochastic frontier analysis show that irr...