[Report of the Medical Officer of Health for Tottenham] page 27

Tottenham 1956

[Report of the Medical Officer of Health for Tottenham]

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Table: Average Results of the Chemical and Bacteriological Examinations of the Water Supplied to the Borough of Tottenham for the Year 1936 Parts per Million (Unless otherwise stated)

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Average Results of the Chemical and Bacteriological Examinations of the Water Supplied to the Borough of Tottenham for the Year 1936 Parts per Million (Unless otherwise stated)

Description of the Sample	No. of Samples	Ammoniacal Nitrogen	Albuminoid Nitrogen	Oxidised Nitrogen (Nitrate)	Chlorides as CI	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-carbonate)	PH. Value	Phosphate as P.0. 111 4		Silica as Si0₂	Sulphate as S0₄	Conductivity
New River water filtered at Hornsey works	215	0.021	0.068	6.0	36	0.76	0.2	7	304	84	7.7	1.00		13	-	600
New River water filtered at Stoke Newington works	213	0.017	0.069	5.8	36	0.80	0.1	8	302	82	7.8	0.95		13	62	575
River Blames derived filtered water	1598	0.036	0.086	4.3	30	1.16	0.3	13	258	72	7.7	0.90		10	58	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			251	21.7				99.6					0.032
New River water filtered at Stoke Newington works			260	15.2				100.0					Nil
River Thames derived filtered water			3,736	5.0				99.9					0.002