London's Pulse: Medical Officer of Health reports 1848-1972

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Greenwich 1971

[Report of the Medical Officer of Health for Greenwich Borough]

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METROPOLITAN WATER BOARD—Water Examination Department Bacteriological Results—Yearly averages, 1971, of Water Supplied to the London Borough of Greenwich

Source of supplyBEFORE TREATMENTAFTER TREATMENT
Number of samplesAgar plate count per ml.Coliform countEscherichia coli countNumber of samplesAgar plate count per ml.Coliform countE. coli count
20-24 hours at 37°C.3 days at 22°C.Per cent. samples negative in 100 ml.Count per 100 ml.Per cent. samples negative in 100 ml.Count per 100 ml.20-24 hours at 37°C.3 days at 22°C.Per cent. samples negative in 100 ml.Per cent. samples negative in 100 ml.
Thames-derived,8,15453.940•3712•254•915•13,9018•4_99•5199-97
Bexley Well2630•18100•00100•002540•112100•00100•00
(a) Crayford No. 11610•0299•3899•38
(b) Crayford No. 21530•85399•350•199•350•12560•07100•00100•00
(c) Crayford No. 31010•0199•01100•00
Darenth Well2500•01499•20100•002560•04100•00100•00
Deptford Well2143•45299•070•199•532160•118100•00100•00
(a) Wansunt Borehole2490•11499•60--100•00-2541•28100•00100•00
(b) Wansunt Well2326•012999•57-99•57-
Wilmington Well2480•87497•180•2100•002450•31399•18100•00