2013/17 – Googong Reservoir (Australian Capital Territory) – Cyanobacteria, Lead

2013/17:  Googong Reservoir (Australian Capital Territory) – Cyanobacteria

03/07/13: High risk Cyanobacteria >2000 cells/mL or a total biovolume 0.5mm3/L
High risk cyanobacteria Anabaena and Anabaenopsis were detected at a sample point located upstream of the Googong Storage Reservoir. Googong WTP was not operating at the time of the detection.

23/12/13: Cyanobacteria >2000 cells/mL or a total biovolume 0.5mm3/L
High risk cyanobacteria Anabaena was detected at a sample point within the Googong Storage Reservoir at the surface and 3 m. Anabaena was also detected at a sample point located upstream of the reservoir. At the time of the detection Googong WTP was not operating.

11/4/14: Cyanobacteria >2000 cells/mL or a total biovolume 0.5mm3/L
High risk cyanobacteria Anabaena was detected at a sample point within the Googong Storage Reservoir at a depth of 9 m. At the time of the detection Googong WTP was not operating

7/8/14: Raw water in the storage reservoir. Cyanobacteria High risk cyanobacteria Anabaena was detected at a concentration of 2,697 cells/mL within the Googong storage reservoir, approximately 6 km upstream of the off take tower at a depth of 3 m. Googong WTP was online and water was being selectively abstracted from a depth of 15 m. In response to the detection Icon Water’s blue-green algae response plan was activated. Taste and odour monitoring was conducted on a daily basis at the WTP and the Powdered Activated Carbon (PAC) system was placed on standby. Sampling was increased to twice weekly until the bloom declined. No complaints were received for taste or odour during this period.

11/4/16: Raw water in a storage reservoir
High risk cyanobacteria, Anabaena, was detected at a concentration of 3,081 cells/mL in a surface water sample within the Googong storage reservoir, approximately 2.5 km upstream from the off take tower. Googong Water Treatment Plant was offline at the time of sampling. Water quality monitoring continued at the storage reservoir as per the routine monitoring program. No further action was required.

21/11/16: High risk cyanobacteria, Dolicospermum, was detected in two samples collected within the Googong reservoir. At the offtake tower site 4,352 cells/mL were recorded, whilst there were 2,752 cells/mL detected at a site approximately 2.5 km upstream of the offtake tower. Googong Water Treatment Plant was offline at the time of sampling. Water quality monitoring continued at the storage reservoir as per the routine monitoring program. No further action was required.

28/6/17: High risk cyanobacteria, Dolicospermum, was detected at concentrations of 3,128 cells/mL and 2,476 cells/mL in the surface samples at two sites. Each site is located at an inlet to the Googong reservoir and are upstream from the offtake tower. Googong Water Treatment Plant was offline at the time of sampling. Water quality monitoring continued at the storage reservoir as per the routine monitoring program. Data from the program was used to determine whether additional treatment would be utilised once the plant came online.

Googong Foreshore (Australian Capital Territory) – Lead

15/12/14: Water within the distribution system at customer tap
Inorganic or organic chemicals with a health guideline value
Lead was detected above the ADWG in a tap at the Googong Foreshore. After further investigation it was suspected that the elevated lead concentration was from aged water within the service line that the sample was collected from. Icon Water continued to collect samples from the tap to monitor the water quality.