Darwin Harbour report card 2019

Zone 6: Outer Harbour

The 2019 report card overview

Water quality in the Outer Harbour was excellent.

All indicators complied with Water Quality Objectives.

Zone 6 Outer Harbour grade wheel

About the Outer Harbour

The Outer Harbour is a well-mixed system open to coastal exchange.

It receives urban stormwater from Darwin’s northern suburbs and effluent from the Ludmilla Wastewater Treatment Plant is discharged to this part of the Harbour at the East Point outfall.

Seagrass beds occur off Casuarina Coastal Reserve where dugongs can be spotted regularly.


The distribution of the data for all parameters is shown here as box and whisker plots.

For report card grades the median of the data (solid line in the box) is compared to the Water Quality Objective (dotted line) for each parameter.

Zone 6 Outer Harbour turbidity
Zone 6 Outer Harbour dissolved oxygen
Zone 6 Outer Harbour chlorophyll-a
Zone 6 Outer Harbour phosphorusZone 6 Outer Harbour ammoniaZone 6 Outer Harbour nitrogen oxide

Supplementary parameters

Zone 6 Outer Harbour salinity Zone 6 Outer Harbour temperature Zone 6 Outer Harbour pH levels

Last updated: 07 April 2020

Share this page:

Was this page useful?

Describe your experience

More feedback options

To provide comments or suggestions about the NT.GOV.AU website, complete our feedback form.

For all other feedback or enquiries, you must contact the relevant government agency.