[Report of the Medical Officer of Health for Richmond] page 60

Richmond upon Thames 1968

[Report of the Medical Officer of Health for Richmond]

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Table: AVERAGE RESULTS OF THE CHEMICAL EXAMINATION of the water supplied to the London Borough of Richmond uponThames during 1968. Milligrammes per litre (unless otherwise stated)

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AVERAGE RESULTS OF THE CHEMICAL EXAMINATION of the water supplied to the London Borough of Richmond upon

Thames during 1968. Milligrammes per litre (unless otherwise stated)

Description of the Sample	Number of Samples	Ammoniacal Nitrogen	Albuminoid Nitrogen	Nitrate Nitrogen	Oxygen abs. from KMnO,4 hrs. at 27° C.	B.O.D 5 days at 20° C.	Hardness (total) CaC0₃	Hardness (non-carbonate) CaC0₃	Magnesium as Mg	Sodium as Na	Potassium as K.	Chloride as CI	Phosphate as P0₄	Silicate as Si0₂	Sulphate as S0₄	Natural Fluoride as F	Surface-active material as Manoxol OT		Turbidity units	Colour (Burgess units)	pH value	Electrical Conductivity (micromhos)
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)	(12)	(13)	(14)	(15)	(16)	(17)	(18)	(19)	(20)	(21)	(22)	(23)
Hampton		0.017	0.087	3.9	1.20		280	76	4	22.9	5.3	32	2.0	10	62	0.30	0.02		0.1	14	7.9	570

Table: AVERAGE RESULTS OF THE CHEMICAL EXAMINATION of the water supplied to the London Borough of Richmond upon Thames during 1968. Milligrammes per litre (unless otherwise stated)

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AVERAGE RESULTS OF THE CHEMICAL EXAMINATION of the water supplied to the London Borough of Richmond upon Thames during 1968. Milligrammes per litre (unless otherwise stated)

Source of supply	BACTERIOLOGICAL RESULTS — YEARLY AVERAGES, 1968
	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 37° C.	3 days at 22° C.	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 hours at 37° C.	3 days at 22° C.	Per cent, samples negative in 100 ml.	Per cent, samples negative in 100 ml.
Hampton								1,156	9.5		99.74	100.0

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Richmond upon Thames 1968

Table: AVERAGE RESULTS OF THE CHEMICAL EXAMINATION of the water supplied to the London Borough of Richmond uponThames during 1968. Milligrammes per litre (unless otherwise stated)

Table: AVERAGE RESULTS OF THE CHEMICAL EXAMINATION of the water supplied to the London Borough of Richmond upon Thames during 1968. Milligrammes per litre (unless otherwise stated)