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

27 5.5 Myrmidon Creek Myrmidon Creek receives discharge from a sewage treatment plant which services Palmerston and surrounding areas. The influence of the discharge entering the creek appears to be largely confined with no discernable impact to water quality detected downstream at the mouth. Pollutant loads from rural and urban areas during the wet season enter the estuary from the upper reaches where mixed land uses prevail. Figure 11 summarises the results of water quality parameters measured at the Myrmidon Creek monitoring sites. Much of this data has been provided by the Power Water Corporation. Table 9 reports median values and 20th-80th percentiles (compliance), minimum and maximum values of the data measured. Table 9 - Summary of water quality parameters measured in Myrmidon Creek. Two water quality parameters (nutrients total phosphorus and nitrogen) measured did not comply with the WQOs: Water quality at the Myrmidon Creek monitoring zone is in good condition. The highest values of ammonia, total nitrogen and total phosphorus were measured at sites closest to the Myrmidon Creek outfall. Indicators Water Quality Objectives Myrmidon Creek min-max 20th-80th percentiles and (median) pH 6.5-8.5 7.59-8.2 7.8-8 (7.9) Dissolved oxygen (% saturation) 80-100 46.2-114 78-91 (83) Suspended solids (mg/L) <10 1.3-51 3.9 Chlorophyll a (g/L) <4 0.17-15.3 2.04 NO (g/L <20 1.5-352 1.5 Ammonia (g/L) <20 1-18680 7 Total nitrogen (g/L) <300 30-24600 400 Total phosphorus (g/L) <30 2.5-4360 24 Filterable reactive phosphorus (g/L) <10 1.5-3460 6 2014 rating C 27

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