The goals of this project were to: determine if coliform organisms occur in air as viable bio-aerosols near well-heads; determine if the coliforms recovered from well-head bio-aerosols are similar to those commonly found in contaminated wells; and, determine if coliform bio-aerosols experimentally created near a well head are capable of artificially "infecting" a well. Materials and methods used include: well sites; air sampling; bacterial culture and identification; well preparation for artificial contamination; and, artificial well contamination using bio-aerosols. Includes 16 references, table, figure.