Septic Tank and PTP upgrade: opportunity mapping & modelling

{
  "buyer": {
    "id": "GB-PPON-PJDG-6588-XDMM",
    "name": "Natural England"
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  "date": "2025-06-02T15:17:00+01:00",
  "id": "029212-2025",
  "initiationType": "tender",
  "language": "en",
  "ocid": "ocds-h6vhtk-050bea",
  "parties": [
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      "address": {
        "country": "GB",
        "countryName": "United Kingdom",
        "locality": "London",
        "postalCode": "SW1P 4DF",
        "region": "UKI32",
        "streetAddress": "Seacole Building, 2 Marsham Street"
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      "contactPoint": {
        "email": "max.glasser@naturalengland.org.uk",
        "name": "Max Glasser"
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      "id": "GB-PPON-PJDG-6588-XDMM",
      "identifier": {
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    "amendments": [
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        "description": "updated clarifications to bidders questions document",
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    "description": "Natural England are exploring the use of replacing inefficient septic tanks and package treatment plants (PTPs) with PTPs that have a higher treatment efficiency for phosphorus and nitrogen to improve water quality in up to 27 catchments. The anticipated catchments are detailed in a table in the Annex.\nFor each catchment, we require estimates of the following:\u202f\u202f\nScale of opportunity: The scale of opportunity (in units) of upgrading inefficient septic tanks and PTPs in each catchment. This will need to be mapped using GI software.\u202f\nNutrient reduction: The potential nutrient reduction achieved (in kg/TP and kg/TN) for phosphorus and/or nitrogen depending on the NN catchment from replacing inefficient septic tanks and PTPs with more efficient PTPs.\u202f\nCost: The cost of delivering replacement PTPs and septic tanks at-scale.\u202f\u202f\nIn addition to the estimates above, the following deliverables are required:\u202f\u202f\nMethodologies: Will need to be developed based on Natural England\u0027s existing methods and in consultation with Natural England and created using national datasets.\u202f\u202f\nDatasets \u0026 code: Natural England will need the ability to run the model independently once the commission is complete. Any datasets and code used to create the methodology, estimates and mapping will need to be made available to NE upon completion.\u202f\nTechnical reports: The decided upon methodology will need to be written into a report to ensure it is reproducible by others. This should highlight any uncertainties where they arise.\u202f\u202f\nThese deliverables will need to be managed and administered by Natural England once the project is complete and are likely to be amended and updated over time.\u202f",
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      {
        "datePublished": "2025-06-02T15:17:00+01:00",
        "description": "Tender notice on Find a Tender",
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        "format": "text/html",
        "id": "029212-2025",
        "noticeType": "UK4",
        "url": "https://www.find-tender.service.gov.uk/Notice/029212-2025"
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    ],
    "enquiryPeriod": {
      "endDate": "2025-05-30T17:00:00+01:00"
    },
    "id": "NE020525STAPTP",
    "items": [
      {
        "additionalClassifications": [
          {
            "description": "Environmental services",
            "id": "90700000",
            "scheme": "CPV"
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        ],
        "deliveryAddresses": [
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            "countryName": "United Kingdom",
            "region": "UK"
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        "id": "1",
        "relatedLot": "1"
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    ],
    "legalBasis": {
      "id": "2023/54",
      "scheme": "UKPGA",
      "uri": "https://www.legislation.gov.uk/ukpga/2023/54/contents"
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          "startDate": "2025-06-17T00:00:00+01:00"
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        "value": {
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          "amountGross": 57600,
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    "mainProcurementCategory": "services",
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    "procurementMethod": "open",
    "procurementMethodDetails": "Below threshold - open competition",
    "status": "active",
    "submissionMethodDetails": "To apply for this opportunity you must submit your quotation meeting the requirements detailed in the Request for Quotation (RFQ) attached.\nYour response must be sent to max.glasser@naturalengland.org.uk or Jack Baribeau John.Baribeau@naturalengland.org.uk  by 17:00 on 3rd June 2025.\nIf you have any clarification questions linked to this opportunity or the procurement process please submit these via email to max.glasser@naturalengland.org.uk or Jack Baribeau . Please note that, unless commercially sensitive, both the question and the response will be circulated to all tenderers.",
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    "tenderPeriod": {
      "endDate": "2025-06-03T17:00:00+01:00"
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    "title": "Septic Tank and PTP upgrade: opportunity mapping \u0026 modelling",
    "value": {
      "amount": 48000,
      "amountGross": 57600,
      "currency": "GBP"
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}