Record Display for the EPA National Library Catalog

RECORD NUMBER: 29 OF 50

OLS Field Name OLS Field Data
Main Title Nonphotosynthetic Pigmented Bacteria in a Potable Water Treatment and Distribution System.
Author Reasoner, D. J. ; Blannon, J. C. ; Geldreich, E. E. ; Barnick, J. ;
CORP Author Environmental Protection Agency, Cincinnati, OH. Drinking Water Research Div.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/355;
Stock Number PB90-216326
Additional Subjects Microbiology ; Potable water ; Bacteria ; Distribution systems ; Water pollution ; Municipalities ; Growth ; Culture media ; Seasonal variations ; Monitoring ; Temperature ; Correlation ; Reprints ; Standard plate counts ; Heterophic plate count bacteria
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB90-216326 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 08/27/1990
Collation 12p
Abstract
The occurrence of pigmented bacteria in potable water from raw source water through treatment to distribution water, including dead-end locations, was compared at sample sites in a large municipal water system. Media used to enumerate heterotrophic bacteria and differentiate pigmented colonies were standard method plate count (SPC), m-SPC, and R2A agars, incubated up to 7 days at 35C. The predominant pigmented bacteria at most sample locations were yellow and orange, with a small incidence of pink organisms at the flowing distribution site. Seasonal variations were seen, with the yellow and orange organisms shifting in dominance. SPC agar was the lease productive medium for both heterotroph counts and pigmented bacteria differentiation. High levels of pigmented bacteria could pose an increased health risk to immunologically compromised individuals. Therefore, the bacterial quality of the distribution water should be controlled to prevent the development of high concentrations of heterotrophic plate count bacteria, including the pigmented forms.