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November 2025: Chemical, Water Quality and Macroinvertebrate Analysis
- Alison Loxton
- Jan 3
- 2 min read
Hi everyone
Please find attached the results of our Water Quality Monitoring results for November, 2025.
As there hasn’t been heavy rain for some time, water levels in our streams and rivers are less than desirable. The lack of flow can concentrate pollutants yet can also prevent toxic inflows from flood events. The following comments are made for your consideration:
pH levels are tending toward alkalinity which varies from periods when levels are more acidic
Phosphate levels have peaked in some parts of the Coomera River (Heritage Drive, Riverstone Crossing, FG Walker bridge) and also in the Nerang River. One suspects this is primarily due to wastewater from agricultural activities
Ammonia Nitrogen levels are surprisingly low which is good news indicating that septic and sewerage levels are within normal limits
There is toxic algal bloom in Waterhen Lake, which is common this time of year, however this produces a toxic environment for the fish and birds dependent on the lake for their food. If a lack of rain persists, Waterhen Lake will become a toxic bacterial soup.
In fact, this last week at Waterhen Lake, Kim and I found two birds (one dead, one dying) exhibiting symptoms of avian botulism, a virulent disease which is highly contagious. On no account should the birds be approached or touched. Avian botulism is caused by birds eating decaying material in toxic water and feeding by burying their bills into contaminated mud; it is exacerbated by the birds being fed bread which contains yeast harmful to many birds.
There are far less egrets breeding at Waterhen Lake then say three years ago however as they feed in healthy streams and saltwater it probably indicates the lack of small forage fish; this has been noticeable at the Coomera River weir for example.
Many thanks to Helen and Ross, Kim, and Brian for their assistance in undertaking this significant program.
To all of you I trust you will enjoy time with friends and family and return refreshed to face the challenges that 2026 will bring. Remember to remain alert, observant, and ready to do more good for our shared community.
Kindest regards to you all
Steven Gill
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