The Necessity of Controlling Bacterial Populations in Potable Waters: Community Water Supply

Geldreich, Edwin E.; Nash, Harry D.; Reasoner, Donald J.; Taylor, Raymond H.

doi:10.1002/j.1551-8833.1972.tb02753.x

Cited by 148 publications

(83 citation statements)

References 27 publications

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“…Biological interactions provide another potential mechanism to explain the injury of enteric bacteria within aquatic systems. It is generally appreciated that excessive populations of noncoliform heterotrophic bacteria can suppress the enumeration of coliforms in water (Geldreich et al, 1972), although the precise mechanism is unclear. The possibility of biological interactions causing injury was investigated in our laboratory by examining the influence of pseudomonad populations on the enumeration efficiency and injury of a coliform.…”

Section: Other Stressorsmentioning

confidence: 99%

Enumeration, Occurrence, and Significance of Injured Indicator Bacteria in Drinking Water

McFeters

1990

Drinking Water Microbiology

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Section: Other Stressorsmentioning

confidence: 99%

Enumeration, Occurrence, and Significance of Injured Indicator Bacteria in Drinking Water

McFeters

1990

Drinking Water Microbiology

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“…The determination of the total number of heterotrophic bacteria (HPC) has been known to be a better indicator of water quality than the coliform test because many opportunistic pathogens are not in the coliform group. 3 Furthermore, a high HPC interferes with the determination of the coliforms. 4 The present HPC method using R2A agar is the most sensitive test for enumerating the total number of bacteria in treated water.…”

Section: Introductionmentioning

confidence: 99%

Rapid determination of bacteria in drinking water using an ATP assay

Deininger

Lee

2001

Field Analytical Chem & Tech

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The presently used heterotrophic plate count (HPC) for the evaluation of the total number of bacteria in a sample of drinking water takes 7 days of incubation. When the results are known, the water has been consumed and is ineffective for the protection of the health of the consumers. Operators of water treatment systems need to know the bacterial water quality in near real time. Contamination of the system, whether it is intentional, accidental, or due to an inadequate disinfectant residual needs to be discovered much sooner because intervention can then take place in the form of flushing low quality water and/or raising the disinfectant residual. The purpose of this study was therefore to determine if a rapid ATP assay can estimate the HPC in minutes. Two additional methods were used for some samples. The first method was the acridine orange direct count (AODC) that enumerates both viable and nonviable bacteria. The second method was the direct viable count (DVC) that enumerates only viable bacteria. Water samples were obtained from local, national, and international locations. The sample selection criteria were based on proximity to the laboratory, cooperating water utilities, and the travel of the authors. The results of the study show that the rapid ATP assay is highly correlated with the conventional plate count method and the DVC method. The significance of the ATP assay is that it can determine the bacterial quality of the drinking water in less than 5 min.

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“…The role of saprophytic bacteria in water as a better indicator of water quality than coliform index has been questioned (3,15,16). The bacteriological examination of the 40 sites revealed that during the course of study the saprophytic bacteria ranged A3 A5 A7 A9 A11 S1 S3 S5 S7 S9 S11 S13 R1 R3 R5 R7 R9 R11 A3 A5 A7 A9 A11 S1 S3 S5 S7 S9 S11 S13 R1 R3 R5 R7 R9 R11 R13 July 0 5 10 15 20 25 30 35 40 45 A1 A3 A5 A7 A9 A11 S1 S3 S5 S7 S9 S11 S13 R1 R3 R5 R7 R9 R11 R13 September 0 5 10 15 20 25 30 35 40 45 A1 A3 A5 A7 A9 A11 S1 S3 S5 S7 S9 S11 S13 R1 R3 R5 R7 R9 R11 R13 between 0.8 )/10 3 and 8.4 )/10 6 ; however, STSB ranged from 0.5 )/10 3 to 5.0 )/10 6 cfu/100 ml.…”

Section: Resultsmentioning

confidence: 99%

Spatial and temporal variability of saprophytic and water quality bacteria along the coast of the Aqaba and Suez Gulfs and Red Sea, Egypt

El-Shenawy

Farag

2005

Microbial Ecology in Health and Disease

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Spatial and temporal variability of saprophytic (SB) and salt-tolerant saprophytic (STSB) bacterial counts as well total coliforms (TC), Escherichia coli (EC) and faecal streptococci (FS) were investigated in the Egyptian surface coastal waters of the Aqaba and Suez Gulfs as well as the Red Sea. A total of 200 samples was collected from 40 sites during January, March, May, July and September 2002. Hydrographical parameters including water temperature (8C), salinity (S ), dissolved oxygen (DO) and pH were also measured. According to the European and Egyptian current standards, of 200 samples analysed during 2002, 183 samples (91.5%) were acceptable for marine recreational purposes. The results indicated that the water quality of the investigated coastal areas was generally affected by sewage disposal and/or other anthropogenic influences. However, in bathing and recreational areas, the water quality was mainly affected by the excessive human presence, i.e. tourists/visitors and their recreational activities. In general, the counts of all investigated bacterial groups were found to be correlated with each other.

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The Necessity of Controlling Bacterial Populations in Potable Waters: Community Water Supply

Cited by 148 publications

References 27 publications

Enumeration, Occurrence, and Significance of Injured Indicator Bacteria in Drinking Water

Enumeration, Occurrence, and Significance of Injured Indicator Bacteria in Drinking Water

Rapid determination of bacteria in drinking water using an ATP assay

Spatial and temporal variability of saprophytic and water quality bacteria along the coast of the Aqaba and Suez Gulfs and Red Sea, Egypt

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