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

Tottenham 1951

[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 195a

Parts per Million (Unless otherwise stated)

Description of the Sample	No, of Samples	Ammoniacal Nitrogen		Albuminoid Nitrogen		Oxidised Nitrogen		Chlorides as CI.	Oxygen, abs. from Permanganate 3hrs at 80°F	Turbidity in Terms of Silica	Colour. m.m. brown 2ft. Tube Burgess's Tintometer	Hardness (Total)	Hardness (Non- carbonate)	PH. Value	Phosphate as P.O. ¹¹¹4	Silica as si0 ₂	Conductivity
Description of the Sample	No, of Samples	Ammoniacal Nitrogen		Albuminoid Nitrogen		Nitrite	Nitrate	Chlorides as CI.	Oxygen, abs. from Permanganate 3hrs at 80°F	Turbidity in Terms of Silica	Colour. m.m. brown 2ft. Tube Burgess's Tintometer	Hardness (Total)	Hardness (Non- carbonate)	PH. Value	Phosphate as P.O. ¹¹¹4	Silica as si0 ₂	Conductivity
New River water filtered at Hornsey works	250	0.033		0.074			7. 4	40. 8	0.80	0.1	9	308	80	7. 7	0. 51	15	550
New River water filtered at Stoke New- Winston works	250	0.041		0.075			6. 8	40.8	0.78	0.1	9	305	80	7.8	0.48	13	550
River Thames water filtered at Walton works	249	0.021		0.088			4. 5	23.0	1.35	0.2	16	258	63	7.8	0.33	13	450
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		36.0					100.0				Nil
New River water filtered at Stoke Newington works			256		35.6					99.6				0.012
River Thames water filtered at Walton works			255		22.7					99.6				0.004