Public Water Supply Distribution Systems Assessing and Reducing Risks: First Report (2005) / Chapter Skim
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2 Trends Relevant to the Deterioration of Drinking Water in Distribution Systems
2 Trends Relevant to the Deterioration of Drinking Water in Distribution Systems
Pages 4-9
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From page 4... ...
Furthermore, for many of these factors, there are limited data on recent trends such that additional research is needed to better understand current practices. DISTRIBUTION PIPE AGE AND REPLACEMENT RATES There is a large range in the type and age of the pipes that make up American water distribution systems, depending on the population and economic booms of the previous century.
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From page 5... ...
. The trends of aging pipe and increasing numbers of main breaks are of concern because of the potential relationship between waterborne disease outbreaks and main breaks (see the subsequent section on New and Repaired Water Mains)
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From page 6... ...
While the current waterborne disease surveillance summary states that the data are useful "for identifying major deficiencies in providing safe drinking water" (Blackburn et al., 2004) , caution in the interpretation of these data is important, in that the proportion of outbreaks reported may vary with time, location, and the size of the water supply.
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From page 7... ...
. The CDC and EPA have recently completed a series of epidemiologic studies designed to assess the magnitude of endemic waterborne illness associated with consumption of municipal drinking water; a joint report on the results of these studies is forthcoming (Blackburn et al., 2004)
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From page 8... ...
Because of more effective treatments, AIDS patients are living longer but are still at increased risk of enteric infections. Cancer patients and transplant patients often require immunosuppressive therapy that puts them at greater risk of infection during the course of their treatment.
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From page 9... ...
population that may be more susceptible to waterborne disease is growing, fewer Americans are drinking tap water. These trends need to be investigated to determine if they are important factors that should be taken into account when developing a distribution system rule.
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