Organism/ Test
Holding Time
Legionella 
≤2 days
Pseudomonas aeruginosa
≤30 hours
Stenotrophomonas maltophilia, Acinetobacter spp., Burkholderia cepacia
≤1 day
Nontuberculous Mycobacteria (NTM)
≤2 days
Heterotrophic Plate Count (HPC)
≤30 hours
Coliforms: E. coli & Total presence-absence
≤30 hours
BARTS: Iron Related Bacteria, Sulfate Reducing Bacteria, Slime Forming Bacteria, Nitrifying Bacteria, Denitrifying Bacteria 
≤30 hours
Chemistry
≤6 months