AWWA JAW21572

Three sampling designs - weekly, monthly, and spatial cluster - are compared to determine their effectiveness in detecting coliform contamination in small community drinking water systems. Water samples were collected over a one-year period from 15 systems in rural Vermont and New Hampshire. Sampling five times a month, regardless of whether samples were collected simultaneously at five different sites within a system (spatial cluster) or once a week at the same site, detected between 50 and 100 percent more incidents of contamination than were found by sampling once a month. The spatial cluster design was slightly more sensitive than the weekly sampling design in its ability to detect coliform contamination. Includes 6 references, tables, figures.

Product Details

Edition:

Vol. 79 - No. 11

Published:

11/01/1987

Number of Pages:

4

File Size:

1 file , 1.1 MB