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New Taps Reduce False–Positive Coliform Samples
Author(s) -
Ball Douglas B.,
Bischop Gary D.,
DiPrimio Robert J.,
Heyer William M.,
MacLeod Chris M.,
Maruoka Richard K.,
Uemura Keith E.
Publication year - 1993
Publication title -
opflow
Language(s) - English
Resource type - Journals
eISSN - 1551-8701
pISSN - 0149-8029
DOI - 10.1002/j.1551-8701.1993.tb01249.x
Subject(s) - tap water , sample (material) , sampling (signal processing) , coliform bacteria , environmental science , computer science , environmental engineering , telecommunications , biology , chromatography , bacteria , chemistry , detector , genetics
The tap design described in the article is part of LADWP's overall plan to revise and improve the utility's water‐quality monitoring system. There was concern that sampling at customer's taps was allowing false positive or falsely high bacterial readings because of conditions at the tap rather than the actual water quality. The sample taps were installed to avoid having to sample at the customer's tap. Following installation of the taps for sampling, bacteriological test results indicated that detectable levels of coliform bacteria declined nearly 70 percent. The new sample taps ensure that reliable representative samples are collected and the number of required follow‐up samples is minimized.