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This layer contains information on the total number of consented and estimated (previously unknown permitted and unconsented) on-site wastewater management systems (OWMS) for each district of Waitaha Canterbury (by Territorial Authority), along with estimates of the annual load of Total Phosphorus and Total Nitrogen discharged to land from OWMS. The OWMS counts and nutrient loading estimates were generated in 2025 by PHF Science. |
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This layer contains information on the total number of consented and estimated (previously unknown permitted and unconsented) on-site wastewater management systems (OWMS) for each district of Waitaha Canterbury (by Territorial Authority), along with estimates of the annual load of Total Phosphorus and Total Nitrogen discharged to land from OWMS. The OWMS counts and nutrient loading estimates were generated in 2025 by PHF Science. |
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PHF Science (formerly ESR) |
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50000 |
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[] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><DIV STYLE="font-size:12pt"><P><SPAN>OWMS counts</SPAN><SPAN> were derived from </SPAN><SPAN>Environment Canterbury resource consents records and </SPAN><SPAN>the mapping of </SPAN><SPAN>estimated </SPAN><SPAN>OWMS using a method described 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>.</SPAN><SPAN> PHF Science estimated Total Nitrogen and Total Phosphorus loading from OWMS discharges in each </SPAN><SPAN>D</SPAN><SPAN>istrict</SPAN><SPAN>.</SPAN><SPAN> </SPAN><SPAN>F</SPAN><SPAN>urther</SPAN><SPAN> 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><SPAN>.</SPAN><SPAN> </SPAN></P><P><SPAN /></P></DIV></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-size:12pt">OWMS numbers are estimated values generated by a desktop exercise and have not been verified by field visits or property audits. The layer contains static data from 202</SPAN><SPAN STYLE="font-size:12pt">5</SPAN><SPAN STYLE="font-size:12pt"> and is not updated when OWMS are installed or decommissioned. </SPAN><SPAN STYLE="font-size:12pt"> Districts </SPAN><SPAN STYLE="font-size:12pt">(Territorial Authorit</SPAN><SPAN STYLE="font-size:12pt">ies</SPAN><SPAN STYLE="font-size:12pt">)</SPAN><SPAN STYLE="font-size:12pt"> names and boundaries are valid for 2025. Please </SPAN><SPAN STYLE="font-size:12pt">see the PHF Science reports for further assumptions and limitations of the data.</SPAN></P></DIV></DIV></DIV> |
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Estimated number of OWMS in each district |
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["OWMS","onsite wastewater management systems","onsite wastewater","nitrogen loading","phosphorus loading"] |
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en-NZ |
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20000000 |
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