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This layer contains the location of properties in Waitaha Canterbury with consented and estimated (i.e. previously unknown permitted or unconsented) onsite wastewater management systems (OWMS). The estimates were generated in 2025 by PHF Science. |
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This layer contains the location of properties in Waitaha Canterbury with consented and estimated (i.e. previously unknown permitted or unconsented) onsite wastewater management systems (OWMS). The estimates were generated in 2025 by PHF Science. |
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PHF Science and Environment Canterbury |
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5000 |
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<DIV STYLE="text-align:Left;"><DIV><DIV><DIV STYLE="font-size:12pt"><P><SPAN>Consented OWMS were captured from Environment Canterbury Consents records as at 2025. Estimated OWMS were derived by PHF Science from analysis of properties with buildings larger than 10 square metres which had no consented OWMS and were not connected to a centralised wastewater reticulation network from a territorial authority. A full description of the methodology is provided in the </SPAN><A href="https://62397185-821a-4cdf-b4f7-8cc2999495c6.usrfiles.com/ugd/623971_ce14494a8f824505aab3f66ca0e41b71.pdf" STYLE="text-decoration:underline;"><SPAN>Journal of Hydrology New Zealand</SPAN></A><SPAN> and further details are documented in the PHF Science Report "report "</SPAN><SPAN STYLE="font-style:italic;">Estimating onsite wastewater densities and their associated Total Nitrogen and Total Phosphorus mass loading rates across Waitaha Canterbury</SPAN><SPAN>" by Qui and Humphries, February 2026. </SPAN></P></DIV></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><DIV STYLE="font-size:12pt"><P><SPAN>This is a static layer and is not updated when OWMS are consented, installed or decommissioned. Estimated OWMS points are indicated in the centre of the property, not where the actual treatment system or discharge field is located. Data were generated by a desktop analysis and have not been verified in the field. Please see the full reports for further assumptions and limitations. </SPAN></P></DIV></DIV></DIV></DIV> |
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Estimated and consented OWMS in Canterbury |
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["OWMS","onsite wastewater management systems","onsite wastewater"] |
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en-NZ |
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5000000 |
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