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Archived water quality assessments

Water quality at Grange Beach is assessed as being in good, moderate or poor condition by interpreting water chemistry and algal data. >> More

Water quality classification for October 2005 - March 2006

Indicator	Ecosystem	Recreation	Aquaculture
Ammonia	Moderate	NA	Good
Oxidised Nitrogen	Moderate	NA	NA
Total Nitrogen	Good	NA	NA
Total Phosphorus	Good	NA	NA
Turbidity	Good	Good	NA
Chlorophyll (a)	Poor	NA	NA
Heavy Metals	Good	NA	Good
Bacteria	NA	Good	NA

Notes NA = not applicable

Chlorophyll (a) was classified as poor at Grange and both ammonia and oxidised nitrogen were both classified as moderate. This is most likely due to effluent from the Glenelg WWTP, urban stormwater and the Torrens River promoting algal growth, particularly during the warmer months.

Heavy metals were classified as good, which is an improvement from the last period where they were classified as poor. This is likely to be due to less runoff from urban areas due to the warmer months.

Water quality classification for April to September 2005

Indicator	Ecosystem	Recreation	Aquaculture
Ammonia	Good	NA	Good
Oxidised Nitrogen	Good	NA	NA
Total Nitrogen	Good	NA	NA
Total Phosphorus	Good	NA	NA
Turbidity	Good	Good	NA
Chlorophyll (a)	Poor	NA	NA
Heavy Metals	Poor	NA	Poor
Bacteria	NA	Good	NA

Notes NA = not applicable

Chlorophyll (a) (an indicator of algae) was classified as poor at Grange. This is most likely due to effluent from the Glenelg WWTP, urban stormwater and the Torrens River promoting algal growth.

Heavy metals were classified as poor, which is most likely due to urban runoff containing heavy metals washed off roads and galvanised iron roofs.

This page was last modified 31-07-2007