Territory Stories

Darwin Harbour in good health



Darwin Harbour in good health


Westra Van Holthe, Willem

Political affiliation

Country Liberals


Media Releases for 12th Assembly 2012 - 2016; Media Releases; ParliamentNT






Made available by via the Publications (Legal Deposit) Act 2004 (NT)




Oceans; Marine life

Publisher name

Northern Territory Government

File type



Issued as a Media Release

Copyright owner

Northern Territory Government

Parent handle


Citation address


Related items

https://hdl.handle.net/10070/528211; https://hdl.handle.net/10070/528213

Page content

40 Outer Harbour 2014 5.9 Outer Harbour The area is a well-mixed system open to coastal exchange. Effluent from the Ludmilla Wastewater Treatment Plant is discharged to this part of the Harbour at the East Point outfall. Figure 18 summarises the results of water quality parameters measured at Outer Harbour monitoring sites. Table 13 reports median values and 20th-80th percentiles (compliance), minimum and maximum values of the data measured. Table 13 - Summary of water quality parameters measured in the Outer Harbour One water quality parameter (total nitrogen) measured did not comply with the WQOs: Water quality at the Outer Harbour monitoring zone is in very good condition. Highest values of ammonia, total nitrogen and filterable reactive phosphorus were measured at sites closest to the East Point outfall site. Indicators Water Quality Objectives Outer Harbour min-max 20th-80th percentiles and (median) pH 7.0-8.5 7.99-8.79 8.0-8.2 (8.1) Dissolved oxygen (% saturation) 80100 47.4-112 88-101 (92) Suspended solids (mg/L) <10 0.5-45 2 Chlorophyll a (g/L) <1 0.13-5.16 0.8 No (g/L) <10 3-40 4 Ammonia (g/L) <20 1-7584 5 Total nitrogen (g/L) <440 60-9180 475 Total phosphorus (g/L) <20 5-4540 20.5 Filterable reactive phosphorus (g/L) <10 1-175 5 2014 rating B 40

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