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
Enfield 1972
[Report of the Medical Officer of Health for Enfield]
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ENVIRONMENTAL HEALTH
(26): Water supply - Metropolitan Water Board: chemical and mineral analysis
| Average results in milligrams per litre where applicable | ||||||
|---|---|---|---|---|---|---|
| New River Derived | Copper -mills Derived | Thames Derived | Hoe Lane Well Derived | Hadley Road Well Derived | Waltham Abbey Well Derived | |
| Number of samples | 104 | 52 | 364 | 4 | 4 | 4 |
| Ammoniacal Nitrogen | 0.014 | 0.019 | 0.031 | 0.088 | 0.130 | 0.190 |
| Albuminoid Nitrogen | 0.050 | 0.100 | 0.069 | 0.026 | 0.019 | 0.022 |
| Nitrate Nitrogen | 7.9 | 8.9 | 6.9 | 0.7 | 0.7 | 0.6 |
| Oxygen abs. from KMn04 4 hrs. at 27oC | 0.70 | 1.36 | 1.06 | 0.37 | 0.22 | 0.50 |
| Hardness (total) CaC03 | 308 | 309 | 274 | 454 | 280 | 278 |
| Hardness (non-carbonate) CaCO3 | 80 | 96 | 82 | 186 | 44 | 58 |
| Magnesium as Mg. | 5.5 | 6.0 | 5.0 | 26.0 | 26.5 | 22.0 |
| Sodium as Na. | 28.8 | 34.6 | 24.5 | - | - | |
| Potassium as K | 5.1 | 7.3 | 5.5 | - | - | - |
| Chloride as CI | 42 | 50 | 35 | 33 | 22 | 25 |
| Phosphate as PO4 | 2.1 | 4.0 | 2.8 | - | - | - |
| Silicate as Si02 | 10 | 10 | 10 | - | - | - |
| Sulphate as SO4 | 52 | 72 | 58 | - | - | - |
| Natural Fluoride as F | 0.15 | 0.17 | 0.15 | 0.49 | 0.95 | 0.43 |
| Surface-active materials as Manoxol OT | 0.02 | 0.02 | 0.02 | - | - | - |
| Turbidity units | 0.1 | 0.1 | 0.1 | 0.6 | 0.4 | 0.2 |
| Colour (Burgess units) | 9 | 14 | 13 | 9 | 4 | 9 |
| pH Value | 7.8 | 7.9 | 7.9 | 7.3 | 7.5 | 7.5 |
| Electrical Conductivity (Micromhos) | 640 | 680 | 570 | 810 | 560 | 550 |