[Report of the Medical Officer of Health for Enfield] page 147

Enfield 1966

[Report of the Medical Officer of Health for Enfield]

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Table: TABLE 31WATER SUPPLYMetropolitan WaterBoard Average Bacteriological Results

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TABLE 31

WATER SUPPLY

Metropolitan Water

Board Average Bacteriological Results

	Results before Treatment
	* Thames derived North of River	New River derived	Hoe Lane Well derived	Hadley Road Well derived	Waltham Abbey Well derived
	Number of samples	—	—	80	246	249
	Agar Plate Count per ml. 20-24 hrs. at 37°C	-	-	0.0	0.1	0.1
	3 days at 22°C	—	—	4	11	4
Coliform Count % samples neg. in 100 ml.	_.	_	9975	82.52	100
Count per 100 ml.	—	—	02	1.2	—
Escherichia coli Count % samples neg. in 100 ml.	_	_	100	84.55	100
Count per 100 ml.	—	—	—	0.9	—
	Results after Treatment
Number of samples	1,744	513	81	254	253
Agar Plate Count per ml. 20-24 hrs. at 37°C	17.5	9.6	0.1	0.7	0.7
3 days at 22°C	—	—	1	49	5
Coliform Count % samples neg. in 100 ml.	99 71	100	100	99.61	100
Escherichia coli Count % samples neg. in 100 ml.	100	100	100	100	100
* Ashford Common, Kempton Park, Hanworth Road and Barn Elms