[Report of the Medical Officer of Health for Orpington] page 31

Orpington 1960

[Report of the Medical Officer of Health for Orpington]

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Average Results of the Chemical Examination of the Water supplied to Orpington during the Year 1960.

Milligrammes per litre (unless otherwise stated)

Description of the Sample	No. of Samples		Ammonia Nitrogen		Albuminoid Nitrogen	Oxidised Nitrogen	Chlorides as CL		Oxygen abs. from Permanganate 4 hrs. at 27°C.			Turbidity units		Colour, mm. brown 2 ft. Tube Burgess's Tintometer
						Nitrate
						Eynsford well									7	0.013	0.020	4.1	16	0.06	Nil	Nil
						Horton Kirby well									6	0.012	0.022	4.5	17	0.04	Nil	Nil
Lullingstone well	5		0.014		0.023	3.8	15		Nil			Nil		Nil
Orpington well	4		0.015		0.021	6.6	15		0.04			Nil		Nil
N. Orpington well	4		0.013		0.023	5.0	14		0.04			0.1		Nil
Shortlands well	12		0.016		0.026	5.3	18		0.04			Nil		Nil
Sundridge well	4		0013		0.017	3.0	18		0.04			Nil		Nil
Thames derived	156		0.038		0.080	4.0	28		1.26			0.3		14
(Southern Group)
Description of the Sample	Hardness (Total)	Hardness (non-carbonate)		pH. Value	Phosphate as po4	Silicate as SiO2	Sulphate as sO4	Fluoride as F		Magnesium as Mg.	Surface Active Material as Manoxol		Free CO2	Electrical Conductivity (Gemmhos)
Eynsford well	258	32		7.3			16	0.2					32	475
Horton Kirby	258	38		7.2			20	0.15					30	475
Lullingstone well	246	30		7.2			14	0.15					29	450
Orpington well	278	42		7.1			16	0.1					38	500
N. Orpington well	266	30		7.1			12	0.1					36	475
Shortlands well	282	64		7.2			44	0.15					31	525
Sundridge well	210	42		7.4			28	0.1					15	400
Thames derived	254	68		7.8	1.00	9	58	0.25		4	0.12			525
(Southern Group)