A multiple linear regression analysis showed that the hydrolysis rate of carbamate compounds, which depends only on the chemical property, can be estimated from electronic σI values of three substituents. The estimated values of hydrolysis rate of 18 carbamate compounds agreed with experimental literature data within 2 orders of magnitude. In the case where the σI value of a substituent was not available, it was estimated from the correlation between σI and electron density on carboxyl group of a model compound. The electron density was calculated by semiempirical molecular orbital method. The result of this study suggests the feasibility of predicting the fate of organic compounds in the environment from their chemical structures.