title: Heterotrophic bacteria in drinking water distribution system: a review.
abstract: The microbiological quality of drinking water in municipal water distribution systems (WDS) depends on several factors. Free residual chlorine and/or chloramines are typically used to minimize bacterial recontamination and/or regrowth in WDS. Despite such preventive measures, regrowth of heterotrophic (HPC) and opportunistic bacteria in bulk water and biofilms has yet to be controlled completely. No approach has shown complete success in eliminating biofilms or HPC bacteria from bulk water and pipe surfaces. Biofilms can provide shelter for pathogenic bacteria and protect these bacteria from disinfectants. Some HPC bacteria may be associated with aesthetic and non-life threatening diseases. Research to date has achieved important success in understanding occurrence and regrowth of bacteria in bulk water and biofilms in WDS. To achieve comprehensive understanding and to provide efficient control against bacteria regrowth, future research on bacteria regrowth dynamics and their implications is warranted. In this study, a review was performed on the literature published in this area. The findings and limitations of these papers are summarized. Occurrences of bacteria in WDS, factors affecting bacteria regrowth in bulk water and biofilms, bacteria control strategies, sources of nutrients, human health risks from bacterial exposure, modelling of bacteria regrowth and methods of bacteria sampling and detection and quantification are investigated. Advances to date are noted, and future research needs are identified. Finally, research directions are proposed to effectively control HPC and opportunistic bacteria in bulk water and biofilms in WDS.
authors.affiliation: Department of Civil Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia. SChowdhury@kfupm.edu.sa
authors.forename: Shakhawat
authors.initials: S
authors.lastname: Chowdhury
mesh_terms: D001419:Bacteria / Q000254:growth & development* / Q000302:isolation & purification; D060766:Drinking Water / Q000382:microbiology*; D052836:Heterotrophic Processes; D014871:Water Microbiology; D018508:Water Purification
chemical_list: D060766:Drinking Water
references.citation: Rev Epidemiol Sante Publique. 1986;34(2):89-99
references.pmid: 3738071
references.citation: Water Res. 2003 Jan;37(1):197-205
references.pmid: 12465801
references.citation: Can J Microbiol. 1982 Jun;28(6):667-71
references.pmid: 7116234
references.citation: Water Res. 2002 Feb;36(4):891-8
references.pmid: 11848359
references.citation: Environ Sci Technol. 2004 Nov 15;38(22):5925-31
references.pmid: 15573590
references.citation: Toxicology. 2004 May 20;198(1-3):255-62
references.pmid: 15138049
references.citation: Water Res. 2001 Mar;35(4):1100-5
references.pmid: 11235877
references.citation: J Clin Microbiol. 2003 Jan;41(1):498-9
references.pmid: 12517906
references.citation: Water Res. 2008 Jan;42(1-2):269-77
references.pmid: 17659762
references.citation: Water Res. 2009 Mar;43(4):1075-87
references.pmid: 19070348
references.citation: Water Res. 2001 Mar;35(4):1106-10
references.pmid: 11235878
references.citation: Appl Environ Microbiol. 1990 Feb;56(2):451-62
references.pmid: 2306090
references.citation: Appl Environ Microbiol. 1985 May;49(5):1338-41
references.pmid: 3890748
references.citation: Appl Environ Microbiol. 2002 Jan;68(1):73-81
references.pmid: 11772611
references.citation: Appl Environ Microbiol. 1987 Dec;53(12):2714-24
references.pmid: 3435140
references.citation: Appl Environ Microbiol. 1977 May;33(5):1225-8
references.pmid: 327932
references.citation: Water Res. 2001 Jul;35(10):2554-64
references.pmid: 11394791
references.citation: Can J Microbiol. 2002 Jun;48(6):494-9
references.pmid: 12166676
references.citation: Appl Environ Microbiol. 2010 Mar;76(5):1669-73
references.pmid: 19966018
references.citation: Appl Environ Microbiol. 1981 Jan;41(1):274-87
references.pmid: 7013697
references.citation: Water Res. 2002 Oct;36(17):4319-29
references.pmid: 12420937
references.citation: Int J Food Microbiol. 2004 May 1;92(3):255-63
references.pmid: 15145584
references.citation: Appl Environ Microbiol. 1989 Oct;55(10):2732-4
references.pmid: 16348041
references.citation: Mutat Res. 2007 Nov-Dec;636(1-3):178-242
references.pmid: 17980649
references.citation: Int J Food Microbiol. 2004 May 1;92(3):275-87
references.pmid: 15145586
references.citation: Appl Environ Microbiol. 1997 Apr;63(4):1564-9
references.pmid: 9097452
references.citation: Appl Environ Microbiol. 1982 Nov;44(5):1086-95
references.pmid: 6817710
references.citation: Water Res. 2007 Aug;41(15):3327-36
references.pmid: 17588636
references.citation: Curr Opin Biotechnol. 2004 Jun;15(3):181-6
references.pmid: 15193324
references.citation: Int J Food Microbiol. 2004 May 1;92(3):265-74
references.pmid: 15145585
references.citation: N Engl J Med. 1994 Jul 21;331(3):161-7
references.pmid: 7818640
references.citation: Appl Environ Microbiol. 1985 Dec;50(6):1378-82
references.pmid: 3911903
references.citation: Appl Environ Microbiol. 1982 Oct;44(4):972-87
references.pmid: 7149722
references.citation: J Appl Microbiol. 1997 Apr;82(4):455-61
references.pmid: 9134720
references.citation: Int J Food Microbiol. 2004 May 1;92(3):347-53
references.pmid: 15145593
references.citation: Water Res. 2005 May;39(9):1896-906
references.pmid: 15899288
references.citation: Chemosphere. 2004 May;55(6):915-25
references.pmid: 15041296
references.citation: Environ Health Perspect. 2000 Apr;108(4):315-21
references.pmid: 10753089
references.citation: Water Res. 2003 Mar;37(6):1351-61
references.pmid: 12598197
references.citation: Water Res. 2001 Dec;35(17):4063-71
references.pmid: 11791835
references.citation: Environ Sci Technol. 2008 Nov 15;42(22):8330-8
references.pmid: 19068814
references.citation: J Hazard Mater. 2011 Mar 15;187(1-3):574-84
references.pmid: 21292392
references.citation: Lancet. 1984 Jan 28;1(8370):210-3
references.pmid: 6141347
references.citation: Environ Health Perspect. 2010 Nov;118(11):1523-30
references.pmid: 20833605
references.citation: Water Res. 2009 Mar;43(4):971-8
references.pmid: 19070347
references.citation: Int J Food Microbiol. 2004 May 1;92(3):307-15
references.pmid: 15145589
references.citation: Water Res. 2007 Feb;41(3):551-62
references.pmid: 17184812
references.citation: Water Res. 2002 Mar;36(6):1469-82
references.pmid: 11996337
references.citation: Sci Total Environ. 1985 Sep;44(3):201-14
references.pmid: 4048928
references.citation: Appl Environ Microbiol. 1999 May;65(5):2032-4
references.pmid: 10223996
references.citation: Appl Environ Microbiol. 1992 Aug;58(8):2649-53
references.pmid: 1514811
references.citation: Water Res. 2004 Jul;38(13):3083-91
references.pmid: 15261547
references.citation: Int J Hyg Environ Health. 2007 Dec;210(6):725-732
references.pmid: 17223387
references.citation: Sci Total Environ. 2009 Jul 1;407(14):4189-206
references.pmid: 19419751
references.citation: Water Res. 2002 Oct;36(17):4391-405
references.pmid: 12420943
references.citation: Int J Food Microbiol. 2004 May 1;92(3):365-73
references.pmid: 15145595
references.citation: Int J Food Microbiol. 2004 May 1;92(3):355-64
references.pmid: 15145594
references.citation: Appl Environ Microbiol. 1986 Sep;52(3):434-8
references.pmid: 3767356
references.citation: Curr Opin Biotechnol. 2006 Jun;17(3):297-302
references.pmid: 16701992
references.citation: Can J Microbiol. 2004 Mar;50(3):183-91
references.pmid: 15105885
references.citation: J Appl Microbiol. 1998 Dec;85 Suppl 1:29S-38S
references.pmid: 21182690
references.citation: Can J Microbiol. 1989 Apr;35(4):520-3
references.pmid: 2743222
references.citation: Water Res. 2001 Mar;35(3):675-82
references.pmid: 11228964
references.citation: Environ Sci Technol. 2001 Sep 1;35(17):3442-7
references.pmid: 11563644
references.citation: Epidemiol Infect. 2000 Dec;125(3):505-22
references.pmid: 11218201
references.citation: Water Res. 2002 Nov;36(18):4477-86
references.pmid: 12418650
references.citation: Int J Food Microbiol. 2004 May 1;92(3):241-7
references.pmid: 15145582
references.citation: Water Res. 2010 Mar;44(5):1353-60
references.pmid: 19944442
references.citation: Water Res. 2004 Oct;38(17):3769-79
references.pmid: 15350429
references.citation: Appl Environ Microbiol. 1991 Apr;57(4):945-8
references.pmid: 2059052
references.citation: Environ Health Perspect. 2001 Aug;109(8):773-8
references.pmid: 11564611
references.citation: Appl Environ Microbiol. 1988 Mar;54(3):649-54
references.pmid: 3288119
references.citation: Water Res. 2008 Jul;42(13):3393-404
references.pmid: 18541283
references.citation: Water Res. 2004 Mar;38(5):1197-206
references.pmid: 14975653
references.citation: Water Res. 2007 Oct;41(18):4222-32
references.pmid: 17604076
references.citation: Water Res. 2001 May;35(7):1757-65
references.pmid: 11329678
references.citation: Water Res. 2004 Jan;38(1):225-35
references.pmid: 14630121
references.citation: Appl Environ Microbiol. 1993 Jul;59(7):2293-8
references.pmid: 8357261
references.citation: Int J Food Microbiol. 1989 Dec;9(4):295-312
references.pmid: 2701859
references.citation: Appl Environ Microbiol. 2000 Jan;66(1):268-76
references.pmid: 10618235
references.citation: Int J Food Microbiol. 2004 May 1;92(3):249-54
references.pmid: 15145583
references.citation: Water Res. 2007 May;41(10):2127-38
references.pmid: 17408720
references.citation: Appl Environ Microbiol. 1991 Mar;57(3):857-62
references.pmid: 2039235
references.citation: Int J Food Microbiol. 2004 May 1;92(3):289-95
references.pmid: 15145587
references.citation: Int J Food Microbiol. 2004 May 1;92(3):297-306
references.pmid: 15145588
references.citation: Water Res. 2003 Sep;37(15):3689-96
references.pmid: 12867336
references.citation: Appl Environ Microbiol. 1984 Nov;48(5):918-23
references.pmid: 6508306
references.citation: Microb Ecol. 1999 Nov;38(4):330-347
references.pmid: 10758180
references.citation: Water Res. 2003 Apr;37(8):1805-17
references.pmid: 12697225
references.citation: Appl Environ Microbiol. 1985 Jan;49(1):1-7
references.pmid: 3883894
references.citation: Appl Environ Microbiol. 1996 Jul;62(7):2201-11
references.pmid: 8779557
references.citation: Offentl Gesundheitswes. 1987 Oct;49 Suppl 1:14-20
references.pmid: 2962040