[Report of the Medical Officer of Health for Southwark, Borough of] page 51

Southwark 1968

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

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METROPOUTAN WATER BOARD- WATER EXAMINATION DEPARTMENT

AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE LONDON BOROUGH OF SOUTHWARK

Milligrammes per litre (unless otherwise stated)

Description of the Sample	Number of Samples Day of the month	Ammoniacal Nitrogen	Albuminoid Nitrogen	Nitrate Nitrogen	Oxygen abs. from KMnO₄4 hrs at 27° C.	B.O.D. 5 days at 20°C	Hardness (total) CaC0₃	Hardness non carbonate CaCO₃	Magnesium as Mg	Sodium as Na	Potassium K	Chloride as Cl	Phosphate as PO₄	Silicate as SiO_₂	Sulphate as SO₄,	Natural Fluoride as F	Surface active material as Manoxol OT		Turbidity units	Colour (Burgess units)	pH value	Elec Cond (micr
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)	(12)	(13)	(14)	(15)	(16)	(17)	(18)	(19)	(20)	(21)	(22)	(23)
ames-derived
uth of River†	156	0.023	0.081	4.0	1.22		271	73	4	22.9	5.3	33	2.0	10	62	0.30	0.02		0.1	14	7.9	5
nor Oak	4	0.014	0.019	0.1	0.07		321	67				15				0.60			0.3	3	7.2	5

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BACTERIOLOGICAL RESULTS - YEARLY AVERAGES

Water supplied to London Borough of Southwark

Source of supply	BEFORE TREATMENT							AFTER TREATMENT
	Number of samples	Agar plate count per ml.		Coliform count		Escherichia coli count		Number of samples	Agar plate count per ml.		Coliform count	E. coli count
	Number of samples	20-24 hours at 370C.	3 days at 220C.	Per cent, samples negative in 100 ml.	Count per 100 ml.	Per cent, samples negative in 100 ml.	Count per 100 ml.	Number of samples	20-24 hour? at 370C.	3 days at 22°C.	Per cent, samples negative in 100 ml.	Per cent, samples negative in 100 ml.
Thames-derived, South of River†								1,931	10.8		99.79	100.0
Honor Oak	36	0.3	51	97.22		100.0	-	35	0.0	17	100.0	100.0

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† Hampton, Surbiton & Walton
51 52