NOVELTY - A biofilm for treatment of wastewater comprises at least one primary adherer bacteria (500) capable of coupling to a substrate (400); and at least one secondary adherer bacteria (600) capable of coupling to at least a portion of the primary adherers. The primary and/or secondary adherer bacteria are capable of reducing a greater amount of contaminant in wastewater in the sessile state than in the planktonic state.    USE - For treating wastewater by reducing contaminants from wastewater (claimed) e.g. industrial wastewater, municipal wastewater and/or water in septic or sewer systems.    ADVANTAGE - The biofilm is capable of quickly reducing a greater amount of contaminant in wastewater in the sessile state than in planktonic state, e.g., wastewater only have to residue in container with the biofilm for less than 24 hours to significantly reduce amount of contaminants in the wastewater. The biofilm treats wastewater using bacteria to reduce the amount of contaminants in the wastewater. The bacteria reduce and/or degrade pesticides, industrial wastewater, wastewater from septic systems, and/or municipal wastewater. The bacteria reduce and/or degrade metal compounds and/or organic compounds such as alkane, alkenes, aromatic organic compounds, and/or polychlorinated benzenes. Some bacteria cleave long chain biopolymers into monomers, which other bacteria degrade. The bacteria in the genus Bacillus create a biofilm capable of surviving in harsh environments; and produce spores that are highly resistant to stressful environments and/or toxic environments. Bacteria in the genus Bacillus synthesize antibiotics that kill proximate bacteria and cause the dead bacteria to lyse and release their contents; absorb the nutrients released by the ruptured cells; and this process requires less energy than forming spores. Bacteria in the genus Pseudomonas capable of degrading organic compounds, such as trichloroethylene, and organic compounds e.g. toluene, xylene, naphthalene, or polynuclear aromatic organic compounds. Bacteria in the genus Zoogloea are capable of degrading high concentrations of proteins, and produce exo-polysaccharide that contributes to the ability of a biofilm containing bacteria in the genus Zoogloea to tolerate fluctuating, stressful, and/or toxic environments.    DETAILED DESCRIPTION - A biofilm for treatment of wastewater comprises at least one primary adherer bacteria (500) capable of coupling to a substrate (400); and at least one secondary adherer bacteria (600) capable of coupling to at least a portion of the primary adherers. The primary and/or secondary adherer bacteria are capable of reducing a greater amount of contaminant in wastewater in the sessile state than in the planktonic state. The primary adherer bacteria comprise a stalk (700) capable of coupling with the substrate; filaments (750) capable of coupling with other bacteria and/or the substrate; or bacteria capable of binding with a hydrophobic substrate such that the bacteria is inhibited from being dislodged from the substrate during use. The secondary adherer bacteria comprise filaments. INDEPENDENT CLAIMS are included for the following: (1) treating wastewater involving allowing primary adherer bacteria to reproduce in bacteria generators, where the primary bacteria is capable of coupling to a substrate; allowing secondary adherer bacteria to reproduce bacteria generators, where the secondary bacteria is capable of coupling to the primary adherer bacteria, and reducing contaminants in water during use; allowing a biofilm comprising primary and secondary adherer bacteria to form in a container; and #reducing foaming in a wastewater treatment system involving introducing hydrophobic substrates in containers, where containers comprise bacteria including bacteria in the order Actinomycetales and/or Thiotrichales for reducing contaminants in water; and (2) reducing foaming in the containers by allowing at least a portion of the bacteria to couple to the hydrophobic substrates.    DESCRIPTION OF DRAWING(S) - The figure shows a representation of the biofilm of bacteria coupled to substrate.    substrate (400)    primary adherer bacteria (500)    secondary adherer bacteria (600)    stalk (700)    filament. (750)