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

Tottenham 1950

[Report of the Medical Officer of Health for Tottenham]

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Results of the Chemical and Bacteriological Examinations of the Water Supplied to the Borough of Tottenham

for the Year 1950.

Parts per Million (Unless otherwise stated).

Description of the Sample	No. of Samples	Ammoniacal Nitrogen	Albuminoid Nitrogen	Oxidised Nitrogen		Chlorides as C1	Oxygen abs. from Permanganate 3hrs at 80°E	Turbidity in Terms of Silica	Colour, m.m. brown 2ft. Tube Burgess's Tintometer	Hardness (Total)	Hardness (Permanent)	pH., Value	Phosphate as P-O¹¹¹₄	Silica as Si0₂	Conductivity
Description of the Sample	No. of Samples	Ammoniacal Nitrogen	Albuminoid Nitrogen	Nitrite	Nitrate	Chlorides as C1	Oxygen abs. from Permanganate 3hrs at 80°E	Turbidity in Terms of Silica	Colour, m.m. brown 2ft. Tube Burgess's Tintometer	Hardness (Total)	Hardness (Permanent)	pH., Value	Phosphate as P-O¹¹¹₄	Silica as Si0₂	Conductivity
New River water filtered at Hornsey works.	242	0.037	0.071		8.1	51,6	0.67	0.2	8	315	91	7.7	0.82	15.0	575
New River water filtered at Stoke New-ington works.	244	0.029	0.067		7.8	51,2	0.66	0.1	8	314	92	7.8	0.84	16.0	575
River Thames water filtered at Walton works.	244	0.018	0.097		3.1	27.6	1.32	0.3	17	260	81	7.8	0. 39	11.0	475

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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	257	7.9	100.0	Nil
New River water filtered at Stoke Newington works	257	12.2	100.0	Nil
River Thames water filtered at Walton works	25 3	15.3	100.0	Nil