Three groundwater samples collected near two underground coal gasification (UCG) sites 15 mo after the end of gasification were analyzed for dissolved organic contaminants. The contaminants consisted of phenols, automatic carboxylic acids, aromatic hydrocarbons, ketones, aldehydes, pyridines, quinolines, isoquinolines, and aromatic amines. Concentrations ranged up to about 50 ppm with large variations both in the relative concentrations of acidic, neutral, and basic constituents and in the concentrations of individual compounds. Naphthalene, o-xylene, 2-methylpyridine, and o-cresol were consistently present in high concentrations and were identified as UCG contaminant-indicator compounds that appear to be particularly useful for monitoring purposes. A simplified method of analysis for these compounds was developed.