Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Greenwich Borough]
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METROPOLITAN WATER BOARD—Water Examination Department Average Results of the Chemical Examination of the Water Supply to the London Borough of Greenwich - Year 1971 Milligrammes per litre (unless otherwise stated)
Description of the Sample | No. of Samples | Ammonical Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Oxygen abs. from KMnO44 hrs. at 27°C. | B.O.D. 5 days at 20° C | Hardness (total) CaCO3 | Hardness (non-carbonate) CaC03 | 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 (micro-ohms) | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) | (15) | (16) | (17) | (18) | (19) | (20) | (21) | (22) | (23) |
Thames-derived | 364 | 0•029 | 0•084 | 6•1 | 1•04 | 281 | 90 | 5 | 23•5 | 5•1 | 34 | 2•3 | 10 | 64 | 0•15 | 0•02 | 0•1 | 13 | 7•8 | 580 | ||
Bexley Well | 5 | 0•011 | 0•019 | 6•0 | 0•09 | 308 | 74 | 23 | 0•10 | 0•0 | 3 | 7•2 | 570 | |||||||||
(a) Crayford No. 1 | 4 | 0•007 | 0•033 | 8•8 | 0•23 | 288 | 143 | 35 | 0•10 | 0•0 | 2 | 7•1 | 790 | |||||||||
(b) Crayford No. 2 | 4 | 0•010 | 0•020 | 7•3 | 0•09 | 292 | 70 | 30 | 0•15 | 0•0 | 1 | 7•2 | 590 | |||||||||
(c) Crayford No. 3 | 4 | 0•007 | 0•023 | 8•5 | 0•24 | 347 | 110 | 31 | 0•10 | 0•0 | 2 | 7•1 | 670 | |||||||||
Darenth Well | 4 | 0•009 | 0•021 | 6•2 | 0•11 | 285 | 60 | 21 | 0•10 | 0•0 | 1 | 7•2 | 550 | |||||||||
Deptford Well | 4 | 0•009 | 0•020 | 6•5 | 0•11 | 367 | 128 | 42 | 0•15 | 0•1 | 2 | 7•2 | 740 | |||||||||
Wansunt Well | 53 | 0•160 | 0•038 | 7•6 | 0•19 | 340 | 99 | 31 | 0•10 | 0•1 | 3 | 7•1 | 690 | |||||||||
Wilmington Well | 4 | 0•020 | 0•029 | 9•0 | 0•19 | 295 | 74 | 28 | 0•14 | 0•0 | 1 | 7•4 | 560 |