[Report of the Medical Officer of Health for Lewisham Borough] page 92

Lewisham 1969

[Report of the Medical Officer of Health for Lewisham Borough]

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Table 77

Average results of the chemical examination of the water supplied to the Borough of Lewisham during 1969

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 KMnO4 4 hrs. at 27° C.	Hardness (total) CaCO3	Hardness (non-carbonate) CaCO3	Magnesium as Mg	Sodium as Na	Potassium as K	Chloride as CI	Phosphate as PO4	Silicate as SiO2	Sulphate as SO4	Natural Fluoride as F	Surface-active material as Manoxol OT	Turbidity units	Colour (Burgess units)	pH value	Electrical Conductivity (micromhos)
River Thames-derived 371		0.024	0.083	4.4	1.05	282	79	5	24.0	5.4	32	2.1	9	58	0.25	002	0.1	11	7.9	550
Deptford	4	0.009	0.025	5.9	0.12	380	150	—	—	—	42	—	—	—	0.25	—	0.0	4	7.2	730
Wilmington	3	0.011	0.033	7.6	0.12	295	70	—	—	—	27	—	—	—	0.15	—	0.0	0	7.3	560
Darenth	4	0.006	0.016	4.6	0.12	276	54	—	—	—	18	—	—	—	0.15	—	0.0	2	7.4	490
Bexley	4	0.008	0.017	5.4	0.30	335	90	—	—	—	20	—	—	—	0.15	—	0.0	4	7.2	600
Merton	4	0.005	0.017	0.2	0.08	252	38	—	—	—	13	—	—	—	0.50	—	0.4	4	7.4	430