[Report of the Medical Officer of Health for Tottenham] page 32

Tottenham 1953

[Report of the Medical Officer of Health for Tottenham]

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Average Results of the Chemical and Bacteriological Examinations of the Water Supplied to the Borough of Tottenham for the Year 1953

Parts per Million (Unless otherwise stated)

Description of the Sample	No. of Samples	Ammoniacal Nitrogen		Albuminoid Nitrogen	Oxidised Nitrogen (Nitrate)	Chlorides as Cl	Oxygen abs. from Permanganate 4 hrs. at 27° C	Turbidity in Terms of Silica	Colour, m. m. brown 2ft. Tube Burgess's Tintometer		Hardness (Total)	Hardness (Non-carconate)	PH. Value	Phosphate as P.O. 111 4		Silica as sio₂	Conductivity
New River water filtered at Hornsey works	235	0.008		0.059	5. 5	37.5	0. 59	0. 1	7		305	74	7.8	0. 72		14	600
New River water filtered at Stoke Newington works	235	0.008		0.062	5.3	37.4	0.61	0.1	7		304	73	7.9	0.69		13	575
River Thames water filtered at Walton works	236	0.010		0.079	3.8	27.1	1.09	0.3	13		250	64	7.8	0.65		11	500
*Bacteriological Results
Description of Sample			No, of Samples		No. of microbes per ml„ Colonies counted on agar after 20-24 hrs. at 37°C.					Bact. coli Test
Description of Sample			No, of Samples							Percentage of samples negative to Bact. coli in 100 ml.					Bact. coli per 100 ml.
New River water filtered at Hornsey works			256		12.0					100.0					Nil
New River water filtered at Stoke Newington works			258		33. 3					100.0					Nil
River Thames water filtered at Walton works			256		19.7					100.0					Nil