Biofilms are provided which are capable of regulating their own thickness, reducing contamination and preventing biofouling. Constructs are introduced into bacteria that comprise nucleic acid molecules encoding an autoinducer synthase polypeptide, a transcriptional regulator and a biofilm dispersal protein. Nucleic acid molecules may also be introduced which encode a nitric oxide synthase, an epoxide hydrolase, or both. Biofilms of the bacteria may be used to reduce biofouling and contamination of a surface.