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WATER SUPPLY.
The major area of the district is supplied with water from the mains
of the Barnet District Water Company, and the remainder is served by the
Colne Valley Water Company.
All water supplied by the Barnet District Water Company is chlorinated.
A pathological staff is maintained and the water is regularly tested at all
stages. During the year, a total of 1 ,918 bacteriological and 255
chemical examinations of the water were made by the Company1 s own staff.
1 ,433 of these samples were representative of the supply, and,for the first
time, 100% were found to be free from B.Coli.
Fifty-nine samples representative of supply were submitted for independent
analysis and all of these were found to be free from B.Coli.
The Colne Valley Water Company exercises similar controls over its
supplies. Five samples of water were taken by the Department, from the
Barnet District Water Company's supply and submitted for analysis with
satisfactory results in every case.
The water supply to the whole district is considered adequate. One
cottage only in the district is known not to be connected to mains water
supply.
DRAINAGE AND SEWERAGE.
The town is drained and sewered on the separate system, excepting the
older portions of the district where it is a combined system. The sewage
is conveyed to a Sewage Disposal works of 56 acres, where it is screened,
grit removed in detritus tanks, thence to primary settlement tanks and
thereafter distributed over three 80 ft. diameter bacteria filters, followed
by humus removal in rectangular tanks before discharge to the Dollis Brook.
Pumping is necessary for three sewers which have their outlets at a low
point on the works. Part of the Totteridge area drains to the Finchley
Borough sewers; in the outlying areas some properties are on cesspool
drainage or domestic sewage disposal plants, and a few only have pail closets.