[Report of the Medical Officer of Health for Richmond upon Thames] page 51

Richmond upon Thames 1965

[Report of the Medical Officer of Health for Richmond upon Thames]

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

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 KMn0₄4 hrs. at 27° C.		B.O.D. 5 days at 20° C.	Hardness (total) CaC0₃	Hardness (non-carbonate) CaC0₃		Magnesium as Mg				Chloride as C1	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	52	0.041	0.090		4.3	1.20			258	66		4				41	1.9		10	64	0.20		0.09		0.1		15	7.5		550
Richmond wells	4	0.012	0.040		4.7	0.32			314	134						58					0.45				0.1		2	6.9		730
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Source of supply				BACTERIOLOGICAL RESULTS — YEARLY AVERAGES, 1965
				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																				1,073		7.4				100.0			100.0
Richmond wells				488			1.7		577		64.34			20.		79.51		3.5		189		3.9		38		98.94			99.47