[Report of the Medical Officer of Health for Southwark, Borough of] page 66

Southwark 1970

[Report of the Medical Officer of Health for Southwark, Borough of]

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METROPOLITAN WATER BOARDER EXAMINATION DEPARTMENT AVERAGE RESULTS OF THE CHEMICAlMINATION OF WATER SUPPLIED TO THE LONDON BOROUGH SOUTHWARK

Milligrammes per litrss otherwise stated)

Description of the Sample	Number of Samples Day of the month	Ammoniac? Nitrogen	Albuminoid Nitrogen	Nitrate Nitrogen	Oxygen abs. from KMnO₄ 4 hrs at 27°C.	B.O.D 5 days at20°C	Hardness (total) CaC0₃	Hardness (non-carbonate) CaO>j	Magm esium as M	Potassium as K	Chloride as CI	Phosphate as P0₄	Silicate as SiO₂	Sulphate as S0₄	Natural Fluoride as F	Surface-active ma terial as Manoxol OT		Turbidity units	Colour (Burgess units	pH value	Electrical Conductivity (micromhos)
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(11 )	(12)	(13)	(14)	(15)	(16)	(17)	(18)	(19)	(20)	(21)	(22)	(23)
River Thames — derived	363	0.026	0.083	4.8	1.02		274	79	5?	5.6	40	2.7	9	70	0.20	0.03		0.1	11	7.9	570
Honor Oak	4	0.045	0.015	0.3	0.07		306	51			15				0.50			0.4	5	7.4	520
Mernot Abbey	3	0.015	0.021	0.8	0.12		244	22			16				0.50			0.3	6	7.3	480

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BACTERIOLOGICAL RESULTARLY AVERAGESWater supplied to Londough of Southwark

Source of Supply	BEFORE TREATMENT							AFTER TREATMENT
	Number of samples	Agar plate count per ml.		Coliform count		E scherichia coli count		Number of samples	Agar plate count per ml.		Coliform count	E. coli count
	Number of samples	20-24 hours at 37° C.	3 days at 22° C.	Per cent, samples negative in 100 ml.	Count per 100 ml	cent. mles gative in 0 ml.	Count per 100 ml.	Number of samples	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.
River Thames — derived	8,259	31.9		37.91	17.3	3 58	4.7	3,710	8.0		99.92	99.97
Honor Oak	60	0.1	4	96.67	0.1	0 0	—	59	0.1	18	100.0	100.0
Merton Abbey	8	0.1	3	100.0	—	0 0	-	8	0.0	3	100.0	100.0

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