[Report of the Medical Officer of Health for Orpington] page 28

Orpington 1953

[Report of the Medical Officer of Health for Orpington]

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Results of the Chemical and Bacteriological Examination of the Water Supplied to Orpington Urban District Council during 1953.

(Parts per million, unless otherwise stated).

Description of Sample.	No. of Samples.	Ammoniacal Nitrogen	Albuminoid Nitrogen	Oxidised Nitrogen Nitrate	Chlorides as C1.	Oxygen abs. from Permanganate 4 hrs. at 27 °C.	Turbidity in terms of Silica	Colour m.m. brown 2ft. tube Burgess's Tintometer.	Hardness (Total)	Non-Carbonate Hardness	pH Value	Magnesium Mg.	Silica SiO 2	Sulphates SO 4	Conductivity
Orpington Well	4	Nil	0.025	6.7	15.4	0.09	Nil	Nil	281	47	7.2	3.1	15	15	500
N. Orpington Well	2	0.003	0.028	4.2	13.3	0.02	Nil	Nil	259	34	7.3	3.0	15	4	500
Jewels Wood Well	3	Nil	0.018	2.8	9.3	0.10	Nil	Nil	241	23	7.3	3.5	11	4	400
Sundridge Well	4	0.013	0.028	2.3	17.3	0.06	Nil	Nil	213	48	7.4	3.3	18	28	475
Eynsford Well	3	0.003	0.022	3.4	14.5	0.07	Nil	Nil	265	41	7.3	3.2	15	13	425
Shortlands Well	8	0.003	0.022	4.7	15.5	0.12	Nil	Nil	283	68	7.2	3.9	16	41	500
Bexley Well	11	0.005	0.021	4.8	16.1	0.06	Nil	Nil	284	54	7.3	3.9	18	30	450

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Bacteriological Results.

	Before Chlorination (Raw Water).					After Clorination (Water passing into Supply). Bact. coli test
	Plate count (average per millilitre) Colonies counted on Agar			Bact. coli test		Bact. coli test
		22°C.	37°C.	Percentage samples neg. 100 ml.	Average No. per 100 ml.	Number of samples.	Percentage samples neg. 100 ml.	Average No. per 100 ml.
		3 days	20-24 hrs.
Orpington Well	249	1825.6	34.4	99.6	0.008	255	100.0	Nil
N. Orpington Well	242	33.2	1.7	33.1	18.000	248	100.0	Nil
Jewels Wood Well	188	4.4	0.4	96.3	0.053	193	100.0	Nil
Sundridge Well	299	8.2	0.2	99.0	0.017	255	100.0	Nil
Eynsford Well	265	162.6	0.7	99.6	0.008	272	99.6	0.019
Shortlands Well	493	1.9	0.1	99.8	0.004	253	100.0	Nil
Bexley Well	581	0.7	0.2	100.0	Nil	309	100.0	Nil