[Report of the Medical Officer of Health for Finchley] page 62

Finchley 1964

[Report of the Medical Officer of Health for Finchley]

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WATER SUPPLY TO FINCHLEY(1) Chemical Samples Examined

	No. of Samples Examined	Raw Water mg/1.		No. of Samples Examined	Treated Water mg/1.
	No. of Samples Examined	Lead	Fluoride	No. of Samples Examined	Lead	Fluoride
Essendon Pumping Station	10	Absent	Less than 0.2	11	Absent	Less than 0.2
Hatfield Pumping Station	11	Absent	Less than 0.2	11	Absent	Less than 0.2
Northaw Pumping Station	2	Absent	0.7	2	Absent	0.7
North Mimms Pumping Station	12	Absent	Less than 0.2	12	Absent	Less than 0.2
Roestock Pumping Station	1	Absent	Less than 0.2	3	Absent	Less than 0.2
Tyttenhanger Pumping Station	—	—	—	2	Absent	Less than 0.2
Cecil Road (20" main)	—	—	—	4	Absent	Less than 0.2
Arkley Reservoir	—	—	—	5	Absent	Less than 0.2
Total	36			50

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(2) Bacteriological Analysis of Pumping Station Raw Waters

Pumping Stations	No. of Samples Examined	E. Coli ABS/100 Mis.	E. Coli Present in Mis.
Pumping Stations	No. of Samples Examined	E. Coli ABS/100 Mis.	100	50	10	1.0	0.1	0.01
Essendon	50	4	2	7	21	13	3	—
Hatfield	50	22	4	2	13	8	1	—
Northaw	22	17	3	2	—	—	—	—
North Mimms	51	—	—	3	20	13	15	—
Roestock	9	4	2	2	1	—	—	—
Tyttenhanger	5	5	—	—	—	—	—	—
Total	187	52	11	16	55	34	19	—

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(3 ) Bacteriological Analysis of Pumping Station Treated Waters

Pumping Stations	Number of Samples Examined	Number of Samples E. Coli— Absent/ 100ml.	% Purity Treated Water Samples
Essendon	50	50	100
Hatfield	52	52	100
Northaw	22	22	100
North Mimms	366	366	100
Roestock	23	23	100
Tyttenhanger	23	23	100
Total	536	536