{
 "schema": "pompey-sewage/1",
 "retrieved": "2026-11-10",
 "producedBy": "scripts/counts/pompey/fetch/sewage.py",
 "question": "How often, and for how long, did storm overflows discharge into the waters around Portsmouth each year, from which outfalls, and how complete was the monitoring?",
 "years": [
  2020,
  2021,
  2022,
  2023,
  2024,
  2025
 ],
 "scope": {
  "default": "portsmouth-waters",
  "areas": [
   {
    "id": "portsmouth-harbour",
    "label": "Portsmouth Harbour",
    "description": "The harbour and the creeks, lakes and rivers named as draining to it: Fareham Creek, Frater Lake, Workhouse Lake, Ports Creek and the Wallington.",
    "receivingWaters": [
     "Portsmouth Harbour",
     "The Portsmouth Harbour",
     "Trib Of Portsmouth Harbour",
     "Fareham Creek/Portsmouth Hbr",
     "Frater Lake",
     "Frater Lake, Portsmouth Hbr",
     "Workhouse Lake",
     "Workhouse Lake, Portsmouth Hbr",
     "Ports Creek",
     "River Wallington",
     "Wallington River",
     "Wallington River Via Drain",
     "Tributary Of River Wallington",
     "Unnamed Trib Of R. Wallington"
    ]
   },
   {
    "id": "langstone-harbour",
    "label": "Langstone Harbour",
    "description": "The harbour, its channels and lakes on the Portsea Island side (Broom Channel, Great Salterns Lake), and the Hermitage Stream and Brockhampton Creek in Havant.",
    "receivingWaters": [
     "Langstone Harbour",
     "Broom Channel",
     "Great Salterns Lake",
     "Hermitage Stream",
     "Brockhampton Creek"
    ]
   },
   {
    "id": "southsea-eastney",
    "label": "Southsea and Eastney coast",
    "description": "The Solent off Southsea and Eastney, including the Eastney long sea outfall from the Budds Farm treatment works, which serves Havant and Portsmouth.",
    "receivingWaters": [
     "The Solent/Langstone Harbour",
     "The Solent"
    ],
    "box": {
     "e_min": 462500,
     "e_max": 470000,
     "n_min": 92500,
     "n_max": 99500
    }
   }
  ],
  "wider": {
   "label": "Wider Solent",
   "description": "Every Southern Water storm overflow whose outlet lies between easting 440,000 and 480,000 and northing 90,000 and 112,000: the Solent coast from Southampton Water to Chichester Harbour, the north-east Isle of Wight and the rivers and streams that drain to them.",
   "box": {
    "e_min": 440000,
    "e_max": 480000,
    "n_min": 90000,
    "n_max": 112000
   }
  },
  "notPlaced": [
   "Black Brook",
   "Blackbrook Stream",
   "Ditch To The River Alver",
   "Hayling Bay",
   "Hoeford Lake",
   "Hoeford Stream",
   "Saline Estuary",
   "Sheepwash Tributary",
   "Stoke Lake",
   "The Potwell Tributary"
  ],
  "rule": "An outfall is placed by the receiving water named in its latest return (and, for “The Solent”, by its outlet grid reference). Outfalls whose receiving water does not demonstrably drain to these waters are left out of the Portsmouth totals and listed for review."
 },
 "method": [
  "Counted spills use the Environment Agency’s 12/24-hour counting method, so one long event can count as several spills.",
  "Hours are outfall-hours: durations are added across outfalls, which can spill at the same time, so the total is not clock time.",
  "A missing reading is not zero. Years where an outfall is not listed, or its spill count is blank, are shown as gaps.",
  "Monitoring coverage (share of the year the monitor worked) is shown for each outfall and year; low coverage means spills can be under-counted.",
  "The consistent-site series uses only outfalls with a spill count in every year, so changes in how many outfalls were monitored do not drive the trend.",
  "The returns record how long overflows discharged, not how much. Volume is not published for these outfalls.",
  "A spill and a poor water sample nearby do not by themselves show that one caused the other."
 ],
 "portsmouthWaters": {
  "byYear": {
   "2020": {
    "outfallsListed": 48,
    "outfallsWithSpillCount": 31,
    "spills": 561.0,
    "outfallHours": 3339.5,
    "meanCoverage": 96.7,
    "outfallsBelow90Coverage": 3
   },
   "2021": {
    "outfallsListed": 48,
    "outfallsWithSpillCount": 48,
    "spills": 583.0,
    "outfallHours": 2520.0,
    "meanCoverage": 96.8,
    "outfallsBelow90Coverage": 2
   },
   "2022": {
    "outfallsListed": 48,
    "outfallsWithSpillCount": 48,
    "spills": 620.0,
    "outfallHours": 2885.6,
    "meanCoverage": 97.6,
    "outfallsBelow90Coverage": 4
   },
   "2023": {
    "outfallsListed": 48,
    "outfallsWithSpillCount": 48,
    "spills": 840.0,
    "outfallHours": 5291.7,
    "meanCoverage": 96.7,
    "outfallsBelow90Coverage": 2
   },
   "2024": {
    "outfallsListed": 48,
    "outfallsWithSpillCount": 48,
    "spills": 706.0,
    "outfallHours": 4224.0,
    "meanCoverage": 96.1,
    "outfallsBelow90Coverage": 5
   },
   "2025": {
    "outfallsListed": 48,
    "outfallsWithSpillCount": 48,
    "spills": 443.0,
    "outfallHours": 1847.9,
    "meanCoverage": 97.9,
    "outfallsBelow90Coverage": 3
   }
  },
  "consistent": {
   "outfalls": 31,
   "byYear": {
    "2020": {
     "spills": 561.0,
     "outfallHours": 3339.5
    },
    "2021": {
     "spills": 518.0,
     "outfallHours": 2324.1
    },
    "2022": {
     "spills": 505.0,
     "outfallHours": 2420.5
    },
    "2023": {
     "spills": 669.0,
     "outfallHours": 4157.0
    },
    "2024": {
     "spills": 532.0,
     "outfallHours": 3208.1
    },
    "2025": {
     "spills": 378.0,
     "outfallHours": 1706.6
    }
   }
  }
 },
 "areas": {
  "portsmouth-harbour": {
   "byYear": {
    "2020": {
     "outfallsListed": 40,
     "outfallsWithSpillCount": 25,
     "spills": 338.0,
     "outfallHours": 1346.2,
     "meanCoverage": 96.1,
     "outfallsBelow90Coverage": 3
    },
    "2021": {
     "outfallsListed": 40,
     "outfallsWithSpillCount": 40,
     "spills": 394.0,
     "outfallHours": 1051.6,
     "meanCoverage": 96.2,
     "outfallsBelow90Coverage": 2
    },
    "2022": {
     "outfallsListed": 40,
     "outfallsWithSpillCount": 40,
     "spills": 429.0,
     "outfallHours": 1373.3,
     "meanCoverage": 97.9,
     "outfallsBelow90Coverage": 3
    },
    "2023": {
     "outfallsListed": 40,
     "outfallsWithSpillCount": 40,
     "spills": 572.0,
     "outfallHours": 2736.8,
     "meanCoverage": 96.1,
     "outfallsBelow90Coverage": 2
    },
    "2024": {
     "outfallsListed": 40,
     "outfallsWithSpillCount": 40,
     "spills": 458.0,
     "outfallHours": 1977.1,
     "meanCoverage": 95.8,
     "outfallsBelow90Coverage": 4
    },
    "2025": {
     "outfallsListed": 40,
     "outfallsWithSpillCount": 40,
     "spills": 288.0,
     "outfallHours": 686.7,
     "meanCoverage": 97.6,
     "outfallsBelow90Coverage": 3
    }
   },
   "consistent": {
    "outfalls": 25,
    "byYear": {
     "2020": {
      "spills": 338.0,
      "outfallHours": 1346.2
     },
     "2021": {
      "spills": 331.0,
      "outfallHours": 857.8
     },
     "2022": {
      "spills": 316.0,
      "outfallHours": 909.4
     },
     "2023": {
      "spills": 401.0,
      "outfallHours": 1602.0
     },
     "2024": {
      "spills": 285.0,
      "outfallHours": 962.4
     },
     "2025": {
      "spills": 223.0,
      "outfallHours": 545.5
     }
    }
   }
  },
  "langstone-harbour": {
   "byYear": {
    "2020": {
     "outfallsListed": 6,
     "outfallsWithSpillCount": 4,
     "spills": 35.0,
     "outfallHours": 95.2,
     "meanCoverage": 99.7,
     "outfallsBelow90Coverage": 0
    },
    "2021": {
     "outfallsListed": 6,
     "outfallsWithSpillCount": 6,
     "spills": 21.0,
     "outfallHours": 53.5,
     "meanCoverage": 100.0,
     "outfallsBelow90Coverage": 0
    },
    "2022": {
     "outfallsListed": 6,
     "outfallsWithSpillCount": 6,
     "spills": 37.0,
     "outfallHours": 72.5,
     "meanCoverage": 94.8,
     "outfallsBelow90Coverage": 1
    },
    "2023": {
     "outfallsListed": 6,
     "outfallsWithSpillCount": 6,
     "spills": 44.0,
     "outfallHours": 143.4,
     "meanCoverage": 99.9,
     "outfallsBelow90Coverage": 0
    },
    "2024": {
     "outfallsListed": 6,
     "outfallsWithSpillCount": 6,
     "spills": 30.0,
     "outfallHours": 71.0,
     "meanCoverage": 97.0,
     "outfallsBelow90Coverage": 1
    },
    "2025": {
     "outfallsListed": 6,
     "outfallsWithSpillCount": 6,
     "spills": 17.0,
     "outfallHours": 33.2,
     "meanCoverage": 99.8,
     "outfallsBelow90Coverage": 0
    }
   },
   "consistent": {
    "outfalls": 4,
    "byYear": {
     "2020": {
      "spills": 35.0,
      "outfallHours": 95.2
     },
     "2021": {
      "spills": 19.0,
      "outfallHours": 51.5
     },
     "2022": {
      "spills": 35.0,
      "outfallHours": 71.3
     },
     "2023": {
      "spills": 44.0,
      "outfallHours": 143.4
     },
     "2024": {
      "spills": 29.0,
      "outfallHours": 69.8
     },
     "2025": {
      "spills": 17.0,
      "outfallHours": 33.2
     }
    }
   }
  },
  "southsea-eastney": {
   "byYear": {
    "2020": {
     "outfallsListed": 2,
     "outfallsWithSpillCount": 2,
     "spills": 188.0,
     "outfallHours": 1898.1,
     "meanCoverage": 99.8,
     "outfallsBelow90Coverage": 0
    },
    "2021": {
     "outfallsListed": 2,
     "outfallsWithSpillCount": 2,
     "spills": 168.0,
     "outfallHours": 1414.9,
     "meanCoverage": 98.5,
     "outfallsBelow90Coverage": 0
    },
    "2022": {
     "outfallsListed": 2,
     "outfallsWithSpillCount": 2,
     "spills": 154.0,
     "outfallHours": 1439.8,
     "meanCoverage": 100.0,
     "outfallsBelow90Coverage": 0
    },
    "2023": {
     "outfallsListed": 2,
     "outfallsWithSpillCount": 2,
     "spills": 224.0,
     "outfallHours": 2411.6,
     "meanCoverage": 100.0,
     "outfallsBelow90Coverage": 0
    },
    "2024": {
     "outfallsListed": 2,
     "outfallsWithSpillCount": 2,
     "spills": 218.0,
     "outfallHours": 2175.9,
     "meanCoverage": 99.8,
     "outfallsBelow90Coverage": 0
    },
    "2025": {
     "outfallsListed": 2,
     "outfallsWithSpillCount": 2,
     "spills": 138.0,
     "outfallHours": 1127.9,
     "meanCoverage": 98.5,
     "outfallsBelow90Coverage": 0
    }
   },
   "consistent": {
    "outfalls": 2,
    "byYear": {
     "2020": {
      "spills": 188.0,
      "outfallHours": 1898.1
     },
     "2021": {
      "spills": 168.0,
      "outfallHours": 1414.9
     },
     "2022": {
      "spills": 154.0,
      "outfallHours": 1439.8
     },
     "2023": {
      "spills": 224.0,
      "outfallHours": 2411.6
     },
     "2024": {
      "spills": 218.0,
      "outfallHours": 2175.9
     },
     "2025": {
      "spills": 138.0,
      "outfallHours": 1127.9
     }
    }
   }
  }
 },
 "wider": {
  "byYear": {
   "2020": {
    "outfallsListed": 138,
    "outfallsWithSpillCount": 94,
    "spills": 2185.0,
    "outfallHours": 16791.2,
    "meanCoverage": 97.0,
    "outfallsBelow90Coverage": 5
   },
   "2021": {
    "outfallsListed": 138,
    "outfallsWithSpillCount": 137,
    "spills": 2335.41,
    "outfallHours": 13739.4,
    "meanCoverage": 96.1,
    "outfallsBelow90Coverage": 8
   },
   "2022": {
    "outfallsListed": 138,
    "outfallsWithSpillCount": 135,
    "spills": 2238.0,
    "outfallHours": 15280.4,
    "meanCoverage": 96.2,
    "outfallsBelow90Coverage": 9
   },
   "2023": {
    "outfallsListed": 138,
    "outfallsWithSpillCount": 138,
    "spills": 3826.0,
    "outfallHours": 35289.9,
    "meanCoverage": 96.5,
    "outfallsBelow90Coverage": 13
   },
   "2024": {
    "outfallsListed": 138,
    "outfallsWithSpillCount": 138,
    "spills": 3162.0,
    "outfallHours": 24082.2,
    "meanCoverage": 96.9,
    "outfallsBelow90Coverage": 10
   },
   "2025": {
    "outfallsListed": 138,
    "outfallsWithSpillCount": 138,
    "spills": 1986.0,
    "outfallHours": 10991.1,
    "meanCoverage": 97.4,
    "outfallsBelow90Coverage": 10
   }
  },
  "consistent": {
   "outfalls": 93,
   "byYear": {
    "2020": {
     "spills": 2135.0,
     "outfallHours": 16354.6
    },
    "2021": {
     "spills": 2095.41,
     "outfallHours": 12510.6
    },
    "2022": {
     "spills": 2027.0,
     "outfallHours": 14167.2
    },
    "2023": {
     "spills": 3316.0,
     "outfallHours": 31094.2
    },
    "2024": {
     "spills": 2693.0,
     "outfallHours": 20872.3
    },
    "2025": {
     "spills": 1732.0,
     "outfallHours": 9679.5
    }
   }
  }
 },
 "sites": [
  {
   "id": "a00753",
   "name": "Budds Farm Havant Wtw",
   "permit": "A00753",
   "activity": "settled storm, storm",
   "receivingWater": "Langstone Harbour",
   "area": "langstone-harbour",
   "outletNgr": "SZ6858099290",
   "easting": 468580,
   "northing": 99290,
   "lat": 50.78912,
   "lon": -1.02844,
   "years": {
    "2020": {
     "spills": 3.0,
     "hours": 4.78,
     "coverage": 100.0,
     "overflows": 1
    },
    "2021": {
     "spills": 10.0,
     "hours": 37.0,
     "coverage": 100.0,
     "overflows": 1
    },
    "2022": {
     "spills": 12.0,
     "hours": 27.78,
     "coverage": 99.69,
     "overflows": 1
    },
    "2023": {
     "spills": 24.0,
     "hours": 107.92,
     "coverage": 99.3,
     "overflows": 1
    },
    "2024": {
     "spills": 13.0,
     "hours": 43.95,
     "coverage": 97.3,
     "overflows": 1
    },
    "2025": {
     "spills": 9.0,
     "hours": 23.53,
     "coverage": 99.81,
     "overflows": 1
    }
   },
   "notListed": [],
   "flags": []
  },
  {
   "id": "a00752",
   "name": "Budds Farm Havant Wtw",
   "permit": "A00752",
   "activity": "storm",
   "receivingWater": "Brockhampton Creek",
   "area": "langstone-harbour",
   "outletNgr": "SU7067005670",
   "easting": 470670,
   "northing": 105670,
   "lat": 50.84624,
   "lon": -0.99757,
   "years": {
    "2020": {
     "spills": 4.0,
     "hours": 6.37,
     "coverage": 100.0,
     "overflows": 1
    },
    "2021": {
     "spills": 1.0,
     "hours": 1.43,
     "coverage": 100.0,
     "overflows": 1
    },
    "2022": {
     "spills": 7.0,
     "hours": 24.12,
     "coverage": 99.99,
     "overflows": 1
    },
    "2023": {
     "spills": 8.0,
     "hours": 20.55,
     "coverage": 100.0,
     "overflows": 1
    },
    "2024": {
     "spills": 5.0,
     "hours": 14.28,
     "coverage": 99.99,
     "overflows": 1
    },
    "2025": {
     "spills": 3.0,
     "hours": 7.5,
     "coverage": 99.5,
     "overflows": 1
    }
   },
   "notListed": [],
   "flags": []
  },
  {
   "id": "a01277",
   "name": "St Andrews Road Portsmouth Cso",
   "permit": "A01277",
   "activity": "storm",
   "receivingWater": "Broom Channel",
   "area": "langstone-harbour",
   "outletNgr": "SU6874005590",
   "easting": 468740,
   "northing": 105590,
   "lat": 50.84575,
   "lon": -1.02499,
   "years": {
    "2020": {
     "spills": 22.0,
     "hours": 54.46,
     "coverage": 99.89,
     "overflows": 1
    },
    "2021": {
     "spills": 2.0,
     "hours": 0.98,
     "coverage": 100.0,
     "overflows": 1
    },
    "2022": {
     "spills": 4.0,
     "hours": 4.66,
     "coverage": 99.97,
     "overflows": 1
    },
    "2023": {
     "spills": 2.0,
     "hours": 0.25,
     "coverage": 100.0,
     "overflows": 1
    },
    "2024": {
     "spills": 5.0,
     "hours": 1.4,
     "coverage": 99.8,
     "overflows": 1
    },
    "2025": {
     "spills": 3.0,
     "hours": 1.72,
     "coverage": 99.94,
     "overflows": 1
    }
   },
   "notListed": [],
   "flags": [
    "outlet-moved"
   ]
  },
  {
   "id": "a01387",
   "name": "Kirtley Close Drayton Cso",
   "permit": "A01387",
   "activity": "storm",
   "receivingWater": "Langstone Harbour",
   "area": "langstone-harbour",
   "outletNgr": "SU6716004640",
   "easting": 467160,
   "northing": 104640,
   "lat": 50.83739,
   "lon": -1.04761,
   "years": {
    "2020": {
     "spills": 6.0,
     "hours": 29.57,
     "coverage": 98.76,
     "overflows": 1
    },
    "2021": {
     "spills": 6.0,
     "hours": 12.05,
     "coverage": 100.0,
     "overflows": 1
    },
    "2022": {
     "spills": 12.0,
     "hours": 14.71,
     "coverage": 99.98,
     "overflows": 1
    },
    "2023": {
     "spills": 10.0,
     "hours": 14.67,
     "coverage": 100.0,
     "overflows": 1
    },
    "2024": {
     "spills": 6.0,
     "hours": 10.14,
     "coverage": 99.74,
     "overflows": 1
    },
    "2025": {
     "spills": 2.0,
     "hours": 0.49,
     "coverage": 99.95,
     "overflows": 1
    }
   },
   "notListed": [],
   "flags": []
  },
  {
   "id": "a01386",
   "name": "Burrfields Road Portsmouth Cso",
   "permit": "A01386",
   "activity": "storm",
   "receivingWater": "Great Salterns Lake",
   "area": "langstone-harbour",
   "outletNgr": "SU6720002060",
   "easting": 467200,
   "northing": 102060,
   "lat": 50.81419,
   "lon": -1.04751,
   "years": {
    "2020": {
     "spills": null,
     "hours": null,
     "coverage": 99.63,
     "overflows": 1
    },
    "2021": {
     "spills": 2.0,
     "hours": 2.02,
     "coverage": 100.0,
     "overflows": 1
    },
    "2022": {
     "spills": 1.0,
     "hours": 0.83,
     "coverage": 99.98,
     "overflows": 1
    },
    "2023": {
     "spills": 0.0,
     "hours": 0.0,
     "coverage": 100.0,
     "overflows": 1
    },
    "2024": {
     "spills": 0.0,
     "hours": 0.0,
     "coverage": 99.63,
     "overflows": 1
    },
    "2025": {
     "spills": 0.0,
     "hours": 0.0,
     "coverage": 99.99,
     "overflows": 1
    }
   },
   "notListed": [],
   "flags": []
  },
  {
   "id": "a01016",
   "name": "Priorsdean Crescent Havant Cso",
   "permit": "A01016",
   "activity": "storm",
   "receivingWater": "Hermitage Stream",
   "area": "langstone-harbour",
   "outletNgr": "SU7103007430",
   "easting": 471030,
   "northing": 107430,
   "lat": 50.86202,
   "lon": -0.99212,
   "years": {
    "2020": {
     "spills": null,
     "hours": null,
     "coverage": 100.0,
     "overflows": 1
    },
    "2021": {
     "spills": 0.0,
     "hours": 0.0,
     "coverage": 100.0,
     "overflows": 1
    },
    "2022": {
     "spills": 1.0,
     "hours": 0.38,
     "coverage": 69.32,
     "overflows": 1
    },
    "2023": {
     "spills": 0.0,
     "hours": 0.0,
     "coverage": 100.0,
     "overflows": 1
    },
    "2024": {
     "spills": 1.0,
     "hours": 1.2,
     "coverage": 85.55,
     "overflows": 1
    },
    "2025": {
     "spills": 0.0,
     "hours": 0.0,
     "coverage": 99.72,
     "overflows": 1
    }
   },
   "notListed": [],
   "flags": []
  },
  {
   "id": "w00279",
   "name": "Gladys Avenue Portsmouth Cso",
   "permit": "W00279",
   "activity": "storm",
   "receivingWater": "Portsmouth Harbour",
   "area": "portsmouth-harbour",
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   "source": {
    "publisher": "Environment Agency",
    "title": "Bathing water quality: annual compliance classification, Hayling Eastoke",
    "url": "https://environment.data.gov.uk/bwq/profiles/profile.html?site=ukj3307-16300",
    "api": "https://environment.data.gov.uk/doc/bathing-water-quality/compliance-rBWD/point/16300.json?_pageSize=100",
    "sha256": "244b1493f18acc4d43f3c2b8573ec04a5d891b9c30cf1cfce6328f1f2dcfb884",
    "retrieved": "2026-11-10"
   }
  },
  {
   "id": "ukj3307-16350",
   "name": "Hayling Beachlands Central",
   "classifications": [
    {
     "year": 2015,
     "class": "Excellent",
     "firstSample": "2012-05-08",
     "lastSample": "2015-09-22"
    },
    {
     "year": 2016,
     "class": "Excellent",
     "firstSample": "2013-05-07",
     "lastSample": "2016-09-18"
    },
    {
     "year": 2017,
     "class": "Excellent",
     "firstSample": "2014-05-06",
     "lastSample": "2017-09-01"
    },
    {
     "year": 2018,
     "class": "Excellent",
     "firstSample": "2015-05-08",
     "lastSample": "2018-09-02"
    },
    {
     "year": 2019,
     "class": "Excellent",
     "firstSample": "2016-05-04",
     "lastSample": "2019-09-18"
    },
    {
     "year": 2021,
     "class": "Excellent",
     "firstSample": "2017-05-08",
     "lastSample": "2021-09-22"
    },
    {
     "year": 2022,
     "class": "Excellent",
     "firstSample": "2018-05-11",
     "lastSample": "2022-09-12"
    },
    {
     "year": 2023,
     "class": "Excellent",
     "firstSample": "2019-05-03",
     "lastSample": "2023-09-11"
    },
    {
     "year": 2024,
     "class": "Excellent",
     "firstSample": "2021-05-06",
     "lastSample": "2024-09-11"
    },
    {
     "year": 2025,
     "class": "Excellent",
     "firstSample": "2022-05-03",
     "lastSample": "2025-09-08"
    }
   ],
   "source": {
    "publisher": "Environment Agency",
    "title": "Bathing water quality: annual compliance classification, Hayling Beachlands Central",
    "url": "https://environment.data.gov.uk/bwq/profiles/profile.html?site=ukj3307-16350",
    "api": "https://environment.data.gov.uk/doc/bathing-water-quality/compliance-rBWD/point/16350.json?_pageSize=100",
    "sha256": "c103700033bff5d932d5136a5e6eba3c8a7e26f9d3b04a851435f75fbe55ec1b",
    "retrieved": "2026-11-10"
   }
  },
  {
   "id": "ukj3307-16400",
   "name": "Hayling Beachlands West",
   "classifications": [
    {
     "year": 2015,
     "class": "Excellent",
     "firstSample": "2012-05-08",
     "lastSample": "2015-09-22"
    },
    {
     "year": 2016,
     "class": "Excellent",
     "firstSample": "2013-05-07",
     "lastSample": "2016-09-18"
    },
    {
     "year": 2017,
     "class": "Excellent",
     "firstSample": "2014-05-06",
     "lastSample": "2017-09-01"
    },
    {
     "year": 2018,
     "class": "Excellent",
     "firstSample": "2015-05-08",
     "lastSample": "2018-09-02"
    },
    {
     "year": 2019,
     "class": "Excellent",
     "firstSample": "2016-05-04",
     "lastSample": "2019-09-18"
    },
    {
     "year": 2021,
     "class": "Excellent",
     "firstSample": "2017-05-08",
     "lastSample": "2021-09-22"
    },
    {
     "year": 2022,
     "class": "Excellent",
     "firstSample": "2018-05-11",
     "lastSample": "2022-09-12"
    },
    {
     "year": 2023,
     "class": "Excellent",
     "firstSample": "2019-05-01",
     "lastSample": "2023-09-11"
    },
    {
     "year": 2024,
     "class": "Excellent",
     "firstSample": "2021-05-06",
     "lastSample": "2024-09-11"
    },
    {
     "year": 2025,
     "class": "Excellent",
     "firstSample": "2022-05-03",
     "lastSample": "2025-09-08"
    }
   ],
   "source": {
    "publisher": "Environment Agency",
    "title": "Bathing water quality: annual compliance classification, Hayling Beachlands West",
    "url": "https://environment.data.gov.uk/bwq/profiles/profile.html?site=ukj3307-16400",
    "api": "https://environment.data.gov.uk/doc/bathing-water-quality/compliance-rBWD/point/16400.json?_pageSize=100",
    "sha256": "fd0045338e433bb0bd62f7dca5fe1bfc494ab30d05cfc723b8606ea3736427e4",
    "retrieved": "2026-11-10"
   }
  }
 ],
 "shellfish": {
  "beds": [
   {
    "area": "Langstone Harbour",
    "zone": "Langstone Channel",
    "species": "Native oysters",
    "class": "B",
    "meaning": "Must be purified, relaid or cooked before sale",
    "note": "",
    "monitoringPoint": "Langstone Channel",
    "rmp": "B019L"
   },
   {
    "area": "Langstone Harbour",
    "zone": "Langstone Channel",
    "species": "Pacific oysters",
    "class": "B",
    "meaning": "Must be purified, relaid or cooked before sale",
    "note": "",
    "monitoringPoint": "Langstone Channel",
    "rmp": "B019L"
   },
   {
    "area": "Langstone Harbour",
    "zone": "South East Langstone Harbour",
    "species": "Hard clams",
    "class": "B-LT",
    "meaning": "Class B, long-term (designation being phased out from October 2026)",
    "note": "",
    "monitoringPoint": "Stoke Common Lake",
    "rmp": "B019I"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "East Harbour",
    "species": "Hard clams",
    "class": "B-LT",
    "meaning": "Class B, long-term (designation being phased out from October 2026)",
    "note": "",
    "monitoringPoint": "Paulsgrove",
    "rmp": "B020H"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "East Harbour",
    "species": "Native oysters",
    "class": "B-LT",
    "meaning": "Class B, long-term (designation being phased out from October 2026)",
    "note": "",
    "monitoringPoint": "Paulsgrove",
    "rmp": "B020W"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "East Harbour",
    "species": "Pacific oysters",
    "class": "B-LT",
    "meaning": "Class B, long-term (designation being phased out from October 2026)",
    "note": "",
    "monitoringPoint": "Paulsgrove",
    "rmp": "B020W"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "Fareham Lake",
    "species": "Hard clams",
    "class": "B-LT",
    "meaning": "Class B, long-term (designation being phased out from October 2026)",
    "note": "",
    "monitoringPoint": "Fareham Lake North",
    "rmp": "B020S"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "Fareham Lake",
    "species": "Native oysters",
    "class": "C/Time Limited Prohibition",
    "meaning": "Class C, with harvesting prohibited for a set period",
    "note": "Prohibited 1-30 September, Class C from 1 November - 31 August (subject to additional sampling in October)",
    "monitoringPoint": "Fareham Lake North",
    "rmp": "B020U"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "Fareham Lake",
    "species": "Pacific oysters",
    "class": "C/Time Limited Prohibition",
    "meaning": "Class C, with harvesting prohibited for a set period",
    "note": "Prohibited 1-30 September, Class C from 1 November - 31 August (subject to additional sampling in October)",
    "monitoringPoint": "Fareham Lake North",
    "rmp": "B020U"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "Fareham Lake Middle",
    "species": "Native oysters",
    "class": "B",
    "meaning": "Must be purified, relaid or cooked before sale",
    "note": "",
    "monitoringPoint": "Fareham Lake Middle",
    "rmp": "B020V"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "Fareham Lake Middle",
    "species": "Pacific oysters",
    "class": "B",
    "meaning": "Must be purified, relaid or cooked before sale",
    "note": "",
    "monitoringPoint": "Fareham Lake Middle",
    "rmp": "B020V"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "Paulsgrove and Portchester",
    "species": "Carpet clams",
    "class": "C",
    "meaning": "Must be relaid for a long period or cooked before sale",
    "note": "",
    "monitoringPoint": "Paulsgrove",
    "rmp": "B020J"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "Paulsgrove and Portchester",
    "species": "Cockles",
    "class": "C",
    "meaning": "Must be relaid for a long period or cooked before sale",
    "note": "",
    "monitoringPoint": "Paulsgrove",
    "rmp": "B020J"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "West Harbour",
    "species": "Hard clams",
    "class": "B-LT",
    "meaning": "Class B, long-term (designation being phased out from October 2026)",
    "note": "",
    "monitoringPoint": "Fareham Lake",
    "rmp": "B020R"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "West Harbour",
    "species": "Native oysters",
    "class": "B-LT",
    "meaning": "Class B, long-term (designation being phased out from October 2026)",
    "note": "",
    "monitoringPoint": "Fareham Lake",
    "rmp": "B020R"
   },
   {
    "area": "Portsmouth Harbour",
    "zone": "West Harbour",
    "species": "Pacific oysters",
    "class": "B-LT",
    "meaning": "Class B, long-term (designation being phased out from October 2026)",
    "note": "",
    "monitoringPoint": "Fareham Lake",
    "rmp": "B020R"
   }
  ],
  "source": {
   "publisher": "Food Standards Agency",
   "title": "Shellfish classification list and sampling plans",
   "url": "https://www.gov.uk/government/publications/shellfish-classification",
   "file": "https://assets.publishing.service.gov.uk/media/6abd053f26660e5f62a7f14a/Classification_List_and_sampling_plans_-_01_October_2026.xlsx",
   "release": "Updated: 01 October 2026",
   "sha256": "6ce8f2fbd901f2631a7f23c3973c9b0d31f74ed8c21b16c41391d1d3e795291c",
   "retrieved": "2026-11-10"
  },
  "note": "Classes describe how shellfish must be treated before sale, based on E. coli monitoring by Portsmouth Port Health Authority. Classifications run 1 December to 30 November and can change during the year."
 },
 "sources": [
  {
   "id": "edm-2020",
   "publisher": "Environment Agency (data supplied by water companies)",
   "title": "Event Duration Monitoring storm overflow annual return 2020",
   "url": "https://www.data.gov.uk/dataset/19f6064d-7356-466f-844e-d20ea10ae9fd/event-duration-monitoring-storm-overflows-annual-returns",
   "file": "https://environment.data.gov.uk/api/file/download?fileDataSetId=c55e170e-3c75-49a5-8026-a961ff94c8e0&fileName=EDM_2020_Storm_Overflow_Annual_Return.zip",
   "sheet": "Event_Duration_Monitoring_-_Storm_Overflows_-2020/EAv EDM_Return_Southern_Water_Annual_2020.xlsx",
   "sha256": "6d776abaa76a49390e1f133d76e23960d15af90df7871afe2283ab186da09b67",
   "retrieved": "2026-11-10"
  },
  {
   "id": "edm-2021",
   "publisher": "Environment Agency (data supplied by water companies)",
   "title": "Event Duration Monitoring storm overflow annual return 2021",
   "url": "https://www.data.gov.uk/dataset/19f6064d-7356-466f-844e-d20ea10ae9fd/event-duration-monitoring-storm-overflows-annual-returns",
   "file": "https://environment.data.gov.uk/api/file/download?fileDataSetId=c55e170e-3c75-49a5-8026-a961ff94c8e0&fileName=EDM_2021_Storm_Overflow_Annual_Return.zip",
   "sheet": "EDM_2021_Storm_Overflow_Annual_Return/EDM 2021 Storm Overflow Annual Return - all water and sewerage companies.xlsx",
   "sha256": "8a66d32e4694931189dd283b86f026e258a5d284984173adec51b29451891fbe",
   "retrieved": "2026-11-10"
  },
  {
   "id": "edm-2022",
   "publisher": "Environment Agency (data supplied by water companies)",
   "title": "Event Duration Monitoring storm overflow annual return 2022",
   "url": "https://www.data.gov.uk/dataset/19f6064d-7356-466f-844e-d20ea10ae9fd/event-duration-monitoring-storm-overflows-annual-returns",
   "file": "https://environment.data.gov.uk/api/file/download?fileDataSetId=c55e170e-3c75-49a5-8026-a961ff94c8e0&fileName=EDM_2022_Storm_Overflow_Annual_Return.zip",
   "sheet": "EDM_2022_Storm_Overflow_Annual_Return/EDM 2022 Storm Overflow Annual Return - all water and sewerage companies.xlsx",
   "sha256": "fe6fe99de9c8b7488ba71e4303354691fa996e241a238b5eccd28ec8df240fbf",
   "retrieved": "2026-11-10"
  },
  {
   "id": "edm-2023",
   "publisher": "Environment Agency (data supplied by water companies)",
   "title": "Event Duration Monitoring storm overflow annual return 2023",
   "url": "https://www.data.gov.uk/dataset/19f6064d-7356-466f-844e-d20ea10ae9fd/event-duration-monitoring-storm-overflows-annual-returns",
   "file": "https://environment.data.gov.uk/api/file/download?fileDataSetId=c55e170e-3c75-49a5-8026-a961ff94c8e0&fileName=EDM_2023_Storm_Overflow_Annual_Return.zip",
   "sheet": "EDM_2023_Storm_Overflow_Annual_Return/EDM 2023 Storm Overflow Annual Return - all water and sewerage companies.xlsx",
   "sha256": "148d056e4bbc34fd298a166ec890ec826372d573dff826929a15c37bac26e732",
   "retrieved": "2026-11-10"
  },
  {
   "id": "edm-2024",
   "publisher": "Environment Agency (data supplied by water companies)",
   "title": "Event Duration Monitoring storm overflow annual return 2024",
   "url": "https://www.data.gov.uk/dataset/19f6064d-7356-466f-844e-d20ea10ae9fd/event-duration-monitoring-storm-overflows-annual-returns",
   "file": "https://environment.data.gov.uk/api/file/download?fileDataSetId=c55e170e-3c75-49a5-8026-a961ff94c8e0&fileName=EDM_2024_Storm_Overflow_Annual_Return.zip",
   "sheet": "EDM_2024_Storm_Overflow_Annual_Return/EDM 2024 Storm Overflow Annual Return - all water and sewerage companies.xlsx",
   "sha256": "dddb04287f731dc19098def318c12bfe2ced86a90eee98d1bc2e8d716a315cb6",
   "retrieved": "2026-11-10"
  },
  {
   "id": "edm-2025",
   "publisher": "Environment Agency (data supplied by water companies)",
   "title": "Event Duration Monitoring storm overflow annual return 2025",
   "url": "https://www.data.gov.uk/dataset/19f6064d-7356-466f-844e-d20ea10ae9fd/event-duration-monitoring-storm-overflows-annual-returns",
   "file": "https://environment.data.gov.uk/api/file/download?fileDataSetId=c55e170e-3c75-49a5-8026-a961ff94c8e0&fileName=EDM_2025_Storm_Overflow_Annual_Return.zip",
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   "retrieved": "2026-11-10"
  },
  {
   "id": "counting-guidance",
   "publisher": "Department for Environment, Food and Rural Affairs and Environment Agency",
   "title": "Storm overflows policy and guidance (12/24-hour counting)",
   "url": "https://www.gov.uk/government/publications/storm-overflows-policy-and-guidance/storm-overflows-policy-and-guidance"
  }
 ]
}