Lake Albert Water Quality

Current Readings

Most recent samples recorded on: 4th December 2017

 

Blue Green Algae

Bacterial Content

Alert Level

GREENMEDIUM

Blue Green Algae readings and what they mean

No Alert Level Triggered GREEN LEVEL
Surveillance Mode
AMBER LEVEL
Alert Mode 
RED LEVEL
Action Mode 
Action Required   
 No restriction. No restriction.
Routine monitoring to measure cyanobacterial levels.
No restriction.
Increased sampling to enable risks to be more accurately assessed  

WWCC and health authorities to warn the public that the water body is considered to be unsuitable for water contact activities, such as swimming, bathing, sailing, skiing or other direct water-contact sports.

Interpretation of Cyanobacterial alert levels for recreational water (a)

<500 cells/mL M.aeruginosa

Biovolume <0.04 for the combined total of all cyanobacteria.

500 to <5000 cells/mL M.aeruginosa

Biovolume equivalent of >0.04 to <0.4 mm3/L for the combined total of all cyanobacteria.

5000 to <50,000 cells/mL M.aeruginosa

Biovolume equivalent of 0.4 to 4mm3/L for the combined total of all cyanobacteria where a toxic producer is dominantf in the total biovolume

OR

0.4 to < 10 mm3/L for the combined total of all cyanobacteria where known toxic producers are not present.

Level 1 guidelines

10μg/L total microcystins OR

50,000 cells/mL toxic M.aeruginosa or biovolume equivalent of 4mm3L for the combined total of all cyanobacteria where a known toxin producer is dominate* in the total biovolume

OR
Level 2 guidelines

10mm3/L for total biovolume of all cyanobacteria material where the known toxins are NOT present.

OR
Cyanobacteria scums are consistently present.

Health risks = Skin and eye irritation with prolonged contact. Gastrointestinal complaints (eg. vomiting, diarrhoea) from consumption of water. Boiling water does not remove toxins. Fish may be unsafe to eat due to bioaccumulation of toxins.

Livestock including companion animals can be particularly susceptible to toxins produced by algae.

Bacterial content readings and what they mean

LOW MEDIUM HIGH 
Action Required   
No restrictions of use. Maintain regular monitoring. Advise against primaryc contact. WWCC to erect signs. Maintain regular monitoring.  Advise against ALL use. WWCC to erect signs. Maintain regular monitoring.

Interpretation of Faecal Coliform alert levels for recreational water (b)

<150 cfu/100mLd OR

<35 enterococci organisms/100ml

Mediane of last 5 samples 150 - 1,000 cfu/100mLd

OR

35 - <230 enterococci organisms/100ml (Maximum number in any one sample: 60-100 organisms/100mL)

1,000 cfu/100mLd OR

230 enterococci organisms/100ml (Maximum number in any one sample: 450-700 organisms/100mL)

Health risks = Gastrointestinal complaints (e.g. vomiting, diarrhoea) from consumption of water.

Footnotes

a NHMRC (2008) Guidelines for managing risks in recreational water. National Health and Medical Research Council

b ANZECC & ARMCANZ (2000). Australian and New Zealand guidelines for fresh and marine water quality. National Water Quality Management Strategy Paper no. 4. Australian and New Zealand Environment and Conservation Council / Agriculture and Resource Management Council of Australia and New Zealand.

c Primary contact: water used for primary contact activities, such as swimming, bathing or other direct water-contact sports.

d cfu/100mL = colony forming units per 100mL

e Median = The middle number

f Dominate = the species of interest (i.e. known toxic producer) comprises 75% or more of the total biovolume