16-001014-02A (Ultimate SCMMP)

    Status                         Guidance level                                        Recommended action

    Red level action mode          Level 1 guideline:                                    Local authority and health
                                                                                         authorities to warn the public that
                                   • 10 —g/L total microcystins                          the water body is considered to be
                                   or                                                    unsuitable for primary contact
                                                                                         recreation.
                                   • 50 000 cells/mL toxic Microcystis
                                   aeruginosa or biovolume equivalent of • 4
                                   mm3/L for the combined total of all
                                   cyanobacteria where a known toxin
                                   producer is dominant in the total biovolume.
                                        b
                                   or
                                   Level 2 guideline:
                                   • 10 mm3/L for total biovolume of all
                                   cyanobacteria material where known toxins
                                   are not present.
                                   or
                                   cyanobacterial scums are consistently
                                   presentc.

    Notes:
    aThe definition of ‘dominant’ is where the known toxin producer comprises 75% or more of the total cyanobacteria in a representative sample.
    bThis applies where high cell densities or scums of ‘nontoxic’ cyanobacteria are present, i.e. where the cyanobacterial population has been
    tested and shown not to contain known toxins (microcystin, nodularin, cylindrospermopsin or saxitoxins).
    cThis refers to the situation where scums occur at the recreation site each day when conditions are calm, particularly in the morning. Note that it
    is not likely that scums are always present and visible when there is a high population, as the cells may mix down with wind and turbulence and
    then reform later when conditions become stable.
    Source: NH&MRC (2008) Guidelines for Managing Risks in Recreational Water. National Health and Medical Research Council, Australian
    Government.


    7.3 Guidelines for drinking water supply storages (South East Queensland
             Water Corporation)
    These guidelines are based on the water quality objectives developed by SEQ Water Corporation for drinking water
    supply storages. They apply specifically to storages in south-east Queensland but would be appropriate for drinking
    water supply storages throughout Queensland. Note that these guidelines are expressed slightly differently to
    normal guidelines. For example, a Cryptosporidium guideline of >0 implies that action must be taken if values >0
    are detected. The approach used and the significance of ‘Level 1’ and ‘Level 2’ are explained in more detail in the
    table footnotes.




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