The site has been a source of nuisance midges for some time.
Earthworks and weed control began in June and a nutrient stripping basin using a solar powered pump was installed in September.
Mayor Logan Howlett said there was an increasing cover of native vegetation and more animal activity in the site.
“Recent monitoring has indicated the nutrient basin is working as desired and it is hoped that improving the water quality will reduce midges as well as improve the overall health of the wetland,” he said.
“The project was recently showcased at the State Wetland Management Conference and received a great response.”
The City will do further analysis using dye tracers – a non-toxic method that helps gauge flow rates in the basin.