Boags Rocks water quality data

View weekly data on E. coli and Enterococci bacteria levels in the water at Gunnamatta and St Andrews beaches, on the Mornington Peninsula.

We are required to monitor water quality under the conditions of our EPA Victoria licence for the Eastern Treatment Plant, which permits us to release treated effluent into the ocean at Boags Rocks.

Results meet EPA Victoria's standards for recreational water quality if:

  • E. coli median less than 150 per 100ml
  • Enterococci median less than 35 per 100ml
  • Enterococci 75th percentile less than 150 per 100ml

Since the Eastern Treatment Plant tertiary upgrade was completed in 2012, we've dramatically improved the quality of water discharged to Boags Rocks. We've subsequently reviewed our monitoring program using a thorough set of historical trends and are now changing the way we collect E.coli and Enterococci data.

From 2016/17 onwards we will be monitoring a single site at the end of the outfall pipeline, rather than the six sites along Gunnamatta and St Andrews beaches. We are currently updating our website reporting function and will have all data available shortly.

If you have any concerns or would like to hear from us sooner, please feel free to contact us.

E.Coli

Sampling pointSite numberDate updatedMedian E.coli (orgs/100mL) five samples in 30 days
Boags Rocks east117-Jun-2016 0
Gunnamatta beach - west217-Jun-2016 0
Gunnamatta beach - middle317-Jun-2016 0
Gunnamatta beach - east417-Jun-2016 0
Boags Rocks west517-Jun-2016 0
St Andrews beach617-Jun-2016 0

Enterococci

Sampling pointSite numberDate updatedMedian Enterococci (orgs/100mL) five samples in 30 days75th percentile Enterococci (orgs/100mL) 11 samples in 60 days
Boags Rocks east117-Jun-2016 0 0
Gunnamatta beach - west217-Jun-2016 0 0
Gunnamatta beach - middle317-Jun-2016 0 0
Gunnamatta beach - east417-Jun-2016 0 1
Boags Rocks west517-Jun-2016 0 2.5
St Andrews beach617-Jun-2016 0 0

Results are also published in our Annual Report and our Annual Monitoring Report to the Environment Protection Authority.

What the data shows

Results since 2005 have shown water quality at these beaches meets EPA health standards. The Department of Health has advised that Gunnamatta Beach is safe for recreation.

 
Understanding this data

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