Pagham Lagoon Water Quality Investigations

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    "id": "GB-PPON-PJDG-6588-XDMM",
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  "date": "2026-02-11T12:05:59Z",
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  "language": "en",
  "ocid": "ocds-h6vhtk-06026e",
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        "postalCode": "SW1P 4DF",
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        "streetAddress": "Seacole Building, 2 Marsham Street"
      },
      "contactPoint": {
        "email": "Kelly.Jones@naturalengland.org.uk",
        "name": "Kelly Jones"
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        "id": "PJDG-6588-XDMM",
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      "name": "Natural England",
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      "address": {
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        "streetAddress": "Eastleigh Business Centre Wessex House"
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      "contactPoint": {
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  "tender": {
    "description": "Pagham Lagoon (Unit 1 of Pagham Harbour SSSI) has been reported as having poor water quality by an external stakeholder, who provided water quality data showing significantly elevated levels of E. coli, total coliforms, and Enterococci. While these parameters are not typically assessed by Natural England, the concentrations reported are of potential ecological concern. No other water quality data for the lagoon is currently available.\nFollowing further desk-based investigation, the source of the pollutants is still unknown. Natural England are therefore seeking to obtain a baseline understanding of the water quality condition at Pagham Lagoon and identify the sources of pollutants.\nThis will allow Natural England to determine the best course of action to address the water quality issues within Pagham Lagoon. We will then use this baseline knowledge to implement targeted interventions to ensure SSSI condition improvement.\nThe requirements for the investigation are:\n1. Desk based review of known/mapped outfalls into the lagoon, and any other existing evidence.\n2. Mapping of surface water drainage system that feeds into the lagoon, to identify key potential sources.\n3. Testing of the water quality within the lagoon is expected to include a broad range of parameters to establish baseline conditions and identify potential sources of pollution. The following parameters should be assessed as a minimum:\n\u2022 Dissolved Oxygen\n\u2022 Biochemical Oxygen Demand (BOD)\n\u2022 Turbidity\n\u2022 Nitrogen (likely Dissolved Inorganic Nitrogen due to the saline nature)\n\u2022 Phosphorus (preferably soluble reactive phosphorous)\n\u2022 Ammonia\n\u2022 Conductivity\n\u2022 Temperature\n\u2022 Sulphate\n\u2022 Soluble reactive phosphorous\nAdditional parameters of concern will include:\n\u2022 E. coli\n\u2022 Enterococci\n\u2022 Consideration will also be given to possible sediment sampling, subject to confirmation of lagoon connectivity and sediment deposition processes.\n\u2022 Sampling will be undertaken under various weather conditions to determine whether water quality fluctuations are linked to storm events.\n\u2022 Final written report compiling findings from the desk based and on the ground investigation, identifying and distinguishing sources of pollution, and recommendations for actions to improve water quality review of the information suppliers would need to decide whether they would be interested in an opportunity.\nThis is to be completed by 31st March 2026",
    "id": "NE090126WQI",
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    "title": "Pagham Lagoon Water Quality Investigations"
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}