Open Reservoirs and the Sanitary Control of Tap Samples

The Suitability of Farm Water Supplies for Dairy Purposes

“…Indeed, there is evidence (Taylor, 1951;Kline, 1935) to show that the organisms can persist for some time, in some cases for more than a year, while Bardsley (1948) found that soil which had been heavily contaminated with cow manure three years previously still contained large numbers of Bact. Ewing & Hopkins (1930) reported a seasonal rise in the coli-aerogenes content of surface water from May to September, which was when the water attained a temperature of about 20". The factors governing this persistence are uncertain, but the position has been clarified to some extent by recent work by Allen, Pasley & Pierce (1952), where apparently the concentration of nutrient material was of considerable importance, growth of Bact.…”

“…Taylor stated that the increase occurred usually in June, and that a temperature rise was one of the few common factors involved. Ewing & Hopkins (1930) reported a seasonal rise in the coli-aerogenes content of surface water from May to September, which was when the water attained a temperature of about 20". Taylor (1947) showed an interesting seasonal effect in the frequency of isolation of coli-aerogenes types from water mains.…”