[Report of the Medical Officer of Health for Chislehurst] page 56

Chislehurst 1951

[Report of the Medical Officer of Health for Chislehurst]

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Table: TABLE V.WATER SUPPLY.Average Results of the Chemical and Bacteriological Examination of the Water Supply to Chislehurst andSidcup during 1951.

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TABLE V.

WATER SUPPLY.

Average Results of the Chemical and Bacteriological Examination of the Water Supply to Chislehurst andSidcup during 1951.

	Orpington Well	North Orpington Well	Short-lands Well	Eynsford Well	Bexley Well	Wilmington Well	Darenth Well	Thames derived filtered water
Number of samples	2	2	6	⁴	6	6	3	1,749
Ammoniacal Nitrogen	0.000	0.004	0.005	0.014	0.009	0.015	0.007	0.022
Albuminoid Nitrogen	0.016	0.020	0.022	0.032	0.053	0.033	0.023	0.085
Oxidised Nitrogen—Nitrate	8.5	5.3	5.1	4.2	5.8	7.9	5.2	4.0
Chlorides as C1	16.0	13.8	16.3	14.3	17.3	19.8	15.8	22.5
Oxygen abs. from Permanganate 3 hrs. at 80° F.	0.09	0.10	0.05	0.06	0.16	0.12	0.12	1.34
Turbidity in terms of Silica	—	—	—	—	—	-	—	0.2
Colour, M.M. brown 2 ft. tube, Burgess's Tintometer	0	0	0	2	0	2	0	14
Hardness (Total)	292	269	295	264	295	291	264	264
Hardness Non-carbonate	52	34	77	35	61	54	32	63
pH Value	7.3	7.4	7.3	7.3	7.3	7.2	7.4	7.8
Phosphate as P.O. 111/4	—	—	—	—	—	-	-	0.33
Silica as SiO₂	13	15	17	15	17	19	15	11
Conductivity	475	425	450	425	450	475	400	450