Enterococci testing by Queensland Health

⬤ <41: No observed adverse effects
⬤ 41-200: Above the threshold of illness
⬤ 201-500: Substantial elevation in the probability of adverse health outcomes
⬤ >500: Significant risk of high levels of illness transmission

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Readings refer to Enterococci (ENT) colony-forming units (cfu) per 100ml. National Health and Medical Research Council (NHMRC) guidelines say recreational swimming is safe when ENT cfu/100ml is below 41.

Source: Queensland Health