A method has been developed for the analysis of nerve agent degradation products using capillary ion electrophoresis. Analysis of the primary degradation products isopropyl methylphosphonic acid, ethyl methylphosphonic acid, pinacolyl methylphosphonic acid and methylphosphonic acid was accomplished with run times of less than 5 min. Detection of low mg/l levels of degradation products in spiked water samples was possible. Little sample preparation was required for the analysis of the alkyl methylphosphonic acids.