Carmila Creek estuary was the only estuary where water quality was in poor condition in the 2017 report card. This was driven by high chlorophyll-a concentrations and super-saturated concentrations of dissolved oxygen. Super-saturation can occur through the rapid growth of algae releasing oxygen through photosynthesis. This rapid growth of algae can also lead to the high chlorophyll-a concentrations. This is the second year that high chlorophyll-a has been identified in this estuary, highlighting a need for further investigation, especially if high chlorophyll-a concentrations continue to be detected in future report cards.