New South Wales Consolidated Regulations

PUBLIC HEALTH (MICROBIAL CONTROL) REGULATION 2000 - REG 9

9 General operating requirements

(1) For the purposes of section 46 of the Act, the prescribed operating requirements for a regulated system are that the regulated system must be operated as required by AS/NZS 3666.2:2002Air-handling and water systems of buildings-Microbial control-Operation and maintenance .

(2) For the purposes of section 46 of the Act, the additional prescribed operating requirements for a water cooling system are that the system must be equipped with a process designed to control microbial growth, and that process:

(a) must be in operation at all times, and

(b) must be certified by a competent person annually as being an effective process of disinfection under the range of operating conditions that could ordinarily be expected, and

(c) must be sufficiently effective so that:

(i) no sample taken from the system subjected to a test for total Legionella numbers in accordance with the relevant Australian standard has a level of Legionella of more than 10 colony-forming units per millilitre, or

(ii) no sample taken from the system subjected to a test for heterotrophic plate count in accordance with the relevant Australian Standard has a heterotrophic plate count of more than 100,000 colony forming units per millilitre, and

(d) must be supplemented by remedial action taken by a competent person after any test where a level set out in paragraph (c) (i) or (ii) is exceeded.

(3) For the purposes of subclause (2), a reference to a competent person is a reference to a person who is a tertiary qualified chemist, chemical engineer, engineer or microbiologist and who has expertise in the relevant field.