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I just wanted to follow up on my query from yesterday and see if there are any updates. Please let me know when you get a chance.</div>
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Regards  </div>
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Business Co-ordinator </div>
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zouhair.aitbenali@controlflow.co.uk</div>
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</b></span><span class="spanWithBackgroundColor" style="font-family: Arial, Helvetica, sans-serif; color: rgb(23, 78, 134); background-color: white;">1c, Hylton Park, Sunderland, England, SR5 3HD</span></div>
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<span class="spanWithBackgroundColor" style="color: rgb(23, 78, 134); background-color: white;"><b>Visit our website -</b> </span><span class="spanWithBackgroundColor" style="color: black; background-color: white;"><a href="https://controlflow.co.uk/" title="Original URL: https://controlflow.co.uk/. Click or tap if you trust this link." originalsrc="https://controlflow.co.uk/" style="margin: 0px;">Controlflow</a></span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Zouhair Ait Benali <zouhair.aitbenali@controlflow.co.uk><br>
<b>Sent:</b> 30 September 2026 10:07 AM<br>
<b>To:</b> qgis-user@lists.osgeo.org <qgis-user@lists.osgeo.org><br>
<b>Subject:</b> Guidance on matching property locations to WwTW catchments in QGIS</font>
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Hello,</div>
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I am currently using QGIS 3.44 to map properties located within the Stodmarsh nutrient neutrality catchment and identify the wastewater treatment works (WwTW) catchment associated with each property.</div>
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The property locations have been imported using British National Grid eastings and northings, and the project is set to EPSG:27700. I have also imported WwTW catchment polygons, fixed their geometries and reprojected them to EPSG:27700.</div>
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I used “Join attributes by location” and “Extract by location” to match property points with WwTW catchment polygons. Most properties have been matched successfully; however, several properties near Charing WwTW fall outside the mapped Charing sewer catchment
 and therefore return no WwTW match. The affected properties include locations around the TN27 0DG , TN27 0DH / TN25 7AA ,TN25 7GR postcode areas.</div>
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Could you please advise:</div>
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<div class="x_elementToProof" role="presentation" style="margin:1em 0px">Whether “Join attributes by location” is the correct method for this assessment</div>
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<div class="x_elementToProof" role="presentation" style="margin:1em 0px">How I can check whether the unmatched properties are caused by coordinate accuracy, invalid geometry, gaps in the polygon data or incorrect CRS transformation</div>
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<div class="x_elementToProof" role="presentation" style="margin:1em 0px">Whether there is a recommended way to identify properties located just outside a WwTW catchment boundary</div>
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<div class="x_elementToProof" role="presentation" style="margin:1em 0px">Whether “Join attributes by nearest” should be used for initial screening while clearly recording that the connection remains unconfirmed</div>
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<div class="x_elementToProof" role="presentation" style="margin:1em 0px">Whether QGIS provides a method for identifying gaps or overlaps within the WwTW catchment layer</div>
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I understand that the final confirmation of the receiving treatment works would need to come from the relevant wastewater company. At this stage, I would like to ensure that the QGIS analysis and spatial matching have been completed correctly.</div>
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I can provide screenshots, sample coordinates and further information about the layers if required.</div>
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Kind regards,</div>
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Zouhair </div>
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Business Co-ordinator </div>
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zouhair.aitbenali@controlflow.co.uk</div>
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</b></span><span class="x_spanWithBackgroundColor" style="font-family:Arial,Helvetica,sans-serif; color:rgb(23,78,134); background-color:white">1c, Hylton Park, Sunderland, England, SR5 3HD</span></div>
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<span class="x_spanWithBackgroundColor" style="color:rgb(23,78,134); background-color:white"><b>Visit our website -</b> </span><span class="x_spanWithBackgroundColor" style="color:black; background-color:white"><a href="https://controlflow.co.uk/" id="OWA260af696-c902-3f7a-243c-594f5427b788" class="x_OWAAutoLink" title="Original URL: https://controlflow.co.uk/. Click or tap if you trust this link." originalsrc="https://controlflow.co.uk/" style="margin:0px">Controlflow</a></span></div>
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