[Report of the Medical Officer of Health for Enfield] page 83

Enfield 1971

[Report of the Medical Officer of Health for Enfield]

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ENVIRONMENTAL HEALTH

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Table 39 Inspections and ComplaintsSummary of Complaints and Requests for Visits

Accumulation of Refuse	160
Bees	49
Blocked or defective drains	1,851
Dampness in premises	166
Defective water-closets	390
Defective water fittings	26
Defective roofs	86
Disinfection and disinfestation	11
Improvement grants	691
Insanitary or defective conditions of premises	410
Insect infestations	231
Noise nuisance	78
Pigeons	94
Rats or mice	2,244
Scabies	11
Smoke nuisance and Clean Air inquiries	226
Squirrels	36
Unsatisfactory housing conditions including overcrowding	82
Unsound food	111
Verminous premises	125
Wasps	590
Miscellaneous	844
TOTAL	8,512

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Table 40 Water SupplyMetropolitan Water Board Chemical and Mineral Analysis

	Average Results in milligrams per litre where applicable
	Thames Derived	New River Derived	Hoe Lane Well Derived	Hadley Road Well Derived	Waltham Abbey Well Derived
Number of Samples	364	104	4	4	4
Ammoniacal Nitrogen	0.029	0.017	0.089	0.140	0 190
Albuminoid Nitrogen	0.084	0.063	0.027	0.018	0.040
Nitrate Nitrogen	6.1	6.4	0.3	0.3	0.2
Oxygen abs. from KMnO₄ 4 hrs. at 27°C.	1.04	0.60	0.23	0.14	0.33
Hardness (total) CaCO₃	281	302	438	278	273
Hardness (Non-carbonate) CaCO₃	90	84	191	51	66
Magnesium as Mg.	5	5	-	-	-
Sodium as Na.	23.5	30.3	-	-	-
Potassium as K	5.1	5.2	-	-	-
Chloride as CI	34	42	28	22	27
Phosphate as PO₄	2.3	1.8	-	-	-
Silicate as SiO₂	10	9	-	-	-
Sulphate as SO₄	64	62	-	-	-
Natural Fluoride as F.	0.15	0.20	0.40	1.10	0.65
Surface-active materials as Manoxol OT	0.02	0.02	_	_	_
Turbidity units	0.1	0.1	0.6	0.1	0.2
Colour (Burgess units)	13	9	11	6	6
pH Value	7.8	7.8	7.1	7.2	7.4
Electrical Conductivity (Micromhos)	580	630	780	550	550