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snippet: This layer contains information on the density of onsite wastewater management systems in 1 ha grid cells in Waitaha Canterbury. The OWMS estimates were generated in 2025 by PHF Science.
summary: This layer contains information on the density of onsite wastewater management systems in 1 ha grid cells in Waitaha Canterbury. The OWMS estimates were generated in 2025 by PHF Science.
accessInformation: PHF Science and Environment Canterbury
thumbnail:
maxScale: 5000
typeKeywords: []
description: <DIV STYLE="text-align:Left;"><DIV><DIV><DIV STYLE="font-size:12pt"><P><SPAN>Estimated OWMS in Canterbury were mapped </SPAN><SPAN>in 2025 </SPAN><SPAN>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> by PHF Science. The layer shows one-hectare grid cells where one or more consented or estimated OWMS are located within the cell. Full details are given in the PHF Science 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>
licenseInfo: <DIV STYLE="text-align:Left;"><DIV><DIV><DIV STYLE="font-size:12pt"><P><SPAN>This layer is not updated automatically when OWMS are consented, installed or decommissioned. Densities are based on consented and estimated OWMS locations which were generated by a desktop analysis in 2025 and have not been verified in the field. Please see the full PHF Science report for further assumptions and limitations. </SPAN></P></DIV></DIV></DIV></DIV>
catalogPath:
title: OWMS density by 1 ha grid
type:
url:
tags: ["OWMS","onsite wastewater management systems","onsite wastewater","densities"]
culture: en-NZ
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name:
guid:
minScale: 50000
spatialReference: