03. Scope and application

Question 1

This Approved Code of Practice applies to

Answer 1

control of legionella bacteria, in any undertaking involving a work activity

and

where there is a means of creating and transmitting water droplets (aerosols) which may be inhaled

Question 2

There is a reasonably foreseeable risk of exposure to legionella bacteria in:

Answer 2

(a) cooling systems with cooling towers, evaporative condensers or dry/wet
cooling systems;
(b) hot and cold water systems;
(c) spa pools (see paragraph 24);
(d) other plant and systems containing water that can create and increase the risk
from legionella during operation or when being maintained (see paragraphs
13, 14 and 27).

Question 3

An example of a low risk situation may be found:

Answer 3

(a) in a small building without individuals especially ‘at risk’ from legionella
bacteria;
(b) where daily water usage is inevitable and sufficient to turn over the entire
system;
(c) where cold water is directly from a wholesome mains supply (no stored
water tanks);
(d) where hot water is fed from instantaneous heaters or local volume water
heaters (supplying outlets at 50 °C);
(e) where the only outlets are toilets and wash hand basins (no showers).

Question 4

A water system includes

Answer 4

all plant/equipment and components associated with
that system, eg all associated pipework, pumps, feed tanks, valves, showers, heat
exchangers, quench tanks, water softeners, chillers etc.