London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Greenwich 1969
[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 1969
Milligrammes per litre (unless otherwise stated)
| Description of the Sample | No. of Samples Day of the month | Ammoniacal Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Oxygen abs. from KMnO4 4 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 | 371 | 0.024 | 0.083 | 4.4 | 1.05 | 282 | 79 | 5 | 24.0 | 5.4 | 32 | 2. 1 | 9 | 58 | 0.25 | 0.02 | 0.1 | 11 | 7.9 | 550 | ||
| Bexley Well | 4 | 0.008 | 0.017 | 5.4 | 0.30 | 335 | 90 | 20 | 0.15 | 0.0 | 4 | 7.2 | 600 | |||||||||
| (a) Crayford No. 1 | 4 | 0. 013 | 0. 048 | 9. 3 | 0.38 | 416 | 159 | 33 | 0.25 | 0.1 | 3 | 7.1 | 750 | |||||||||
| (b) Crayford No. 2 | 4 | 0 .004 | 0.022 | 6.9 | 0.08 | 305 | 79 | 28 | 0.20 | 0.1 | 1 | 7.4 | 580 | |||||||||
| (c) Crayford No. 3 | 4 | 0. 005 | 0.033 | 7.2 | 0.22 | 356 | 118 | 29 | 0.20 | 0.0 | 2 | 7.3 | 660 | |||||||||
| Darenth Well | 4 | 0. 006 | 0.016 | 4.6 | 0.12 | 276 | 54 | 18 | 0.15 | 0.0 | 2 | 7.4 | 490 | |||||||||
| Deptford Well | 4 | 0. 009 | 0.025 | 5.9 | 0.12 | 380 | 150 | 42 | 0.25 | 0.0 | 4 | 7.2 | 730 | |||||||||
| Wansunt Well | 32 | 0.086 | 0.037 | 6.6 | 0.23 | 356 | 107 | 29 | 0.20 | 0.4 | 3 | 7.2 | 650 | |||||||||
| Wilmington Well | 3 | 0.011 | 0033 | 7.6 | 0. 12 | 295 | 70 | 27 | 0.15 | 0.0 | 0 | 7.3 | 560 |