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101
Environmental Health

Swimming Pools
In addition to Ruislip Lido, part of which is used for bathing purposes, there are twenty swimming
pools in the borough situated at schools, hotels and clubs, etc. Two indoor public pools, one
indoor club pool and one school pool are in use throughout the year the remainder during the summer
months only. Routine checks are carried out on the chlorine content of the pools and, where necessary,
samples are submitted for bacteriological examination.
Concern was felt at the level of supervision and maintenance at some of the smaller pools and
a leaflet was prepared setting out essential points with regard to water purification and pool hygiene
for distribution to all persons concerned with these matters.
41 samples of Mains Water were submitted to the Laboratory for Bacteriological examination
and all were found to be satisfactory.
Private Water Supplies
There remain two houses in the Borough without mains water supply. In addition, a number
of industrial premises draw water from deep wells for manufacturing purposes.
32 samples were taken from well supplies, 2 being classed as unsatisfactory.
Water Supply Points
Whilst the safety of mains water is an accepted fact the results of samples taken from indirect
supplies, water dispensers and samples of ice cubes illustrate a very real danger of contamination.
49 samples were taken from water dispensers 21 from indirect supplies and 18 from ice makers
of which 26 were classed as unsatisfactory calling for further investigations by the Public Health
Inspector who then gave advice on the necessary remedial measures.
Water samples are, in the main, examined by the Public Health Laboratory Service but as there
are certain limitations as to the days on which samples can be taken some additional tests were made
in the department's laboratory and during 1969 these numbered 10. It is proposed to develop these
tests as they will be particularly useful with regard to sampling from aircraft at London Airport.