NOVELTY - Storage stable Pseudomonas composition (I) useful in bioremediation includes an alkali metal nitrate and optionally has monoammonium phosphate as buffer in aqueous solution.    USE - The composition is useful for degrading organic wastes in the environment such as oil or grease.    ADVANTAGE - The composition is stable over long periods at room temperature and is immediately effective for bioremediation. The composition is inexpensive to prepare.    DETAILED DESCRIPTION - An aqueous composition (I) contains a live bacterium of genus Pseudomonas useful for degradation of biodegradable material and comprises water, at least one species of Pseudomonas bacterium at 106-1010 colony forming units (CFU) per ml of water and is selected from P. putida deposited as NRRL-B-18118 and/or NRRL-B-15078 and an alkali metal nitrate in an amount of 0.1-5 wt% of the water and optionally a buffering amount of monoammonium phosphate so that the bacterium is preserved in living form at 25degrees C.    INDEPENDENT CLAIMS are also included for:    (1) a method for degrading a biodegradable material comprising:    (a) holding (I) at 8-35degrees C to provide a preserved bacterium;    (b) inoculating the preserved bacterium into a biodegradable material; and    (c) degrading the biodegradable material with the bacterium;    (2) an aqueous composition containing a live bacterium of genus Pseudomonas useful for degradation of biodegradable material comprising water, at least one species of Pseudomonas bacterium at 106-1010 CFU per ml of water and an alkali metal nitrate in an amount of 0.1-5 wt% of the water and optionally a buffering amount of monoammonium phosphate so that the bacterium is preserved in living form at 25degrees C. The ammonium monophosphate is included in a wt ratio of 1:1 and 125:1 alkali metal nitrate to monoammonium phosphate; and    (3) a method for degradation of a biodegradable material comprising providing the composition as in (2), holding the composition at 8-35degrees C to provide a preserved bacterium, inoculating the preserved bacterium into a biodegradable material and degrading the biodegradable material with the bacterium.