Monitoring water quality around the Southern Landfill

5 months ago

How can the public access the information from the Landfill about water monitoring levels?

What are you monitoring for?

We do specific tests at the Southern Landfill as part of the conditions of our consent for operating the Landfill.

The water tests are taken at points within the Careys Gully stream adjacent to the Southern Landfill itself.

  1. Careys Gully stream upstream of the Landfill

  2. Careys Gully stream downstream of the Landfill

  3. Four boreholes that access the ground water in various locations adjacent to the Landfill.

  4. Leachate collected by our pipes (tested at a manhole)

We do the following tests on ALL the sites monthly.

  • pH
  • BOD5
  • Nitrate-Nitrogen
  • Copper
  • Chromium
  • Conductivity
  • Iron
  • Aluminium
  • Lead
  • Dissolved (Reactive, Phosphorus)
  • NH4-N
  • Manganese
  • Boron
  • Zinc
  • Cadmium
  • Faecal Coliforms
  • Chlorides
  • Arsenic
  • Nickel


On top of this we also conduct Macro Invertebrate Sampling to get a Macroinvertebrate Community Index (MCI) score.

Test are collected by a third party and sent to a laboratory for testing to ensure independence.

Reports are sent to the Southern Landfill and a third party peer reviewer monthly.

If we find issues that could be considered to be a breach of our consent, we alert Greater Wellington Regional Council (GWRC) as well as our Community Liaison Group (CLG). The CLG is made up of representatives from the Greater Regional Wellington Council, Wellington Water, the sludge dewatering plant operators, the Landfill operators, the Greater Brooklyn Residents Association, Owhiro Bay Residents Association and Council’s Waste Operations officers.

At the end of each year, the water quality sampling results are compiled and reviewed by a third party reviewer and sent to the Greater Wellington Regional Council (GWRC) as part of our annual Southern Landfill Compliance report.

GWRC then reviews the information using their own third party experts required and once satisfied provide us with a compliance document.

2018 Extract Southern Landfill Compliance Report.pdf

2019 SLF Aecom Testing for Annual Compliance Report.pdf

Categories: Water Quality
Share on Facebook Share on Twitter Share on Linkedin Email this link