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Home › Rivers › Dee

Dee water levels

7 gauges from New Inn River Station to Ironbridge River Station. None is above its typical high. 2 storm overflows upstream are discharging now. Gauges in Cheshire West and Chester, Denbighshire, Gwynedd, Shropshire; levels are checked every 15 minutes.

7gauges
0above normal
2overflows upstream discharging

Loading the map…

Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
New Inn River Station—1.03 m 15m agoWithin its typical range▼
Dee Bridge River Station 7.7 km by river—1.62 m 15m agoWithin its typical range—
Bala GS River Station 1.3 km by river—0.89 m 30m agoWithin its typical range—
Corwen River Station 22.1 km by riverCorwen0.99 m 15m agoWithin its typical range—
Manley Hall River Station 44.6 km by river—1.11 m 15m agoWithin its typical range—
Farndon 36.1 km by river—6.49 mAOD 15m agoWithin its typical range—
Ironbridge River Station 11.0 km by river—4.99 m 30m agoWithin its typical range▼

Stations are listed from source to mouth as the water flows, traced on the river map (OS Open Rivers) and the Environment Agency’s own links between its gauges. A distance “by river” is along the river, and is shown only where the map traces the path.

Contains OS data © Crown copyright and database rights 2026.

Gauged tributaries

Streams and rivers with a gauge whose water joins the Dee above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.

5 gauged tributaries, 10 gauges

Tryweryn

Joins the Dee between Dee Bridge River Station and Bala GS River Station, no more than 1.1 km by river above Bala GS River Station.

Bala Weir X River Stationstructure0.73 m 15m agoWithin its typical range

Its water passes Bala GS River Station and every gauge below it on the Dee. It does not pass Dee Bridge River Station or the gauges above it.

Gauged streams joining the Tryweryn

Alwen

Joins the Dee between Bala GS River Station and Corwen River Station, no more than 3.9 km by river above Corwen River Station.

Druid River Station0.65 m 30m agoWithin its typical range

Its water passes Corwen River Station and every gauge below it on the Dee. It does not pass Bala GS River Station or the gauges above it.

Alun

Joins the Dee between Farndon and Ironbridge River Station, no more than 12.2 km by river above Ironbridge River Station.

Rhyd Y Mwyn DL River Stationtidal0.20 m 30m agoWithin its typical range
4.8 km by river
Mold Leadmill Bridge River Station0.10 m 30m agoWithin its typical range
6.7 km by river
Pont Blyddyn River Station0.64 m 30m agoWithin its typical range
12.8 km by river
Pont Y Capel River Station0.31 m 30m agoWithin its typical range
5.1 km by river
Rossett River Station0.25 m 30m agoWithin its typical range

Its water passes Ironbridge River Station and every gauge below it on the Dee. It does not pass Farndon or the gauges above it.

Where the Dee goes

No gauge below Ironbridge River Station is known on the river map.

Tributaries and where they join are traced on the river map (OS Open Rivers, edition 2026-04) and the Environment Agency’s links between its gauges. The map holds distances between gauges, not the junctions themselves, so a junction is placed between two gauges, and no further up than the tributary’s own lowest gauge. Contains OS data © Crown copyright and database rights 2026.

Streams without a gauge

Named streams on the river map that flow into the Dee and have no gauge of their own. Each has a page with what is known about it: the next gauge downstream, and any storm overflows or water-sampling points placed on it.

Storm overflows upstream

100 storm overflows are traced upstream of Ironbridge River Station, the Dee’s lowest gauge on the river map: on the Dee itself, on its gauged tributaries, and on smaller streams that join above there.

  • 2 report discharging now
  • 93 not discharging
  • 5 offline or silent: 5 monitor offline, 0 status unknown, 0 no live feed

Official annual figures for the overflows traced upstream of Ironbridge River Station, each return added up on its own. The Environment Agency’s return, 2025: 3 spills over 17 hours, from the 1 that has a figure. Welsh Water’s own return, 2025: 2,372 spills over 12,707 hours in total, across the 93 that have a figure. 6 of the 100 have no figure for 2025. These are two separate returns, so the figures are given side by side, not added together.

Each overflow is listed in the stretch above the first gauge its water reaches, from the source down, as on the Gauges tab. A stretch of the Dee includes the smaller streams that join it there. Every overflow traced is listed here, each stretch in full. Back to the short lists →

Above New Inn River Station, the Dee’s highest gauge1 overflow · 1 discharging now
Between New Inn River Station and Dee Bridge River Station1 overflow
  • Llanuwchllyn WwTW Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Twrch · 7.9 km by river above Dee Bridge River Station · 2025: 108 spills, 1,028 h
Between Dee Bridge River Station and Bala GS River Station1 overflow
  • Bala WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 410 m by river above Bala GS River Station · 2025: 92 spills, 694 h
Between Bala GS River Station and Corwen River Station3 overflows · 1 discharging now
  • Llandrillo Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Ceidiog · 9.9 km by river above Corwen River Station · 2025: 20 spills, 299 h
  • Gwydelwern Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Camddwr · 5.3 km by river above Corwen River Station · 2025: 15 spills, 202 h
  • Cynwyd WwTW Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Dee · 3.4 km by river above Corwen River Station · 2025: 83 spills, 292 h
Alwen, above Druid River Stationjoins the Dee above Corwen River Station1 overflow
Between Corwen River Station and Manley Hall River Station25 overflows
  • Northern Terrace Corwen Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 44.2 km by river above Manley Hall River Station · 2025: 4 spills, 7.8 h
  • Corwen WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 42.5 km by river above Manley Hall River Station · 2025: 58 spills, 882 h
  • Park Avenue Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 22.0 km by river above Manley Hall River Station · 2025: 1 spill, 0.3 h
  • Llangollen Riverside Park Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 21.6 km by river above Manley Hall River Station · 2025: 2 spills, 0.5 h
  • Llangollen Victoria Prom Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 21.6 km by river above Manley Hall River Station · 2025: 2 spills, 0.5 h
  • Llangollen West Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 21.4 km by river above Manley Hall River Station · 2025: 11 spills, 37 h
  • Llangollen East Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 21.3 km by river above Manley Hall River Station · 2025: 5 spills, 1.5 h
  • Abbey Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 21.2 km by river above Manley Hall River Station · 2025: 44 spills, 140 h
  • Berwyn Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee Via Surface Water Sewer · 21.2 km by river above Manley Hall River Station · 2025: 5 spills, 3.8 h · reaches the river through a sewer, so where it enters is approximate
  • Bridge Street Storm Overflow No1 Not discharging
    Dwr Cymru Welsh Water · into River Dee · 21.1 km by river above Manley Hall River Station · 2025: 3 spills, 1.8 h
  • Bridge Street No 2 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 21.0 km by river above Manley Hall River Station · 2025: 44 spills, 59 h
  • Llangollen Church Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 20.9 km by river above Manley Hall River Station · 2025: 2 spills, 0.8 h
  • Llangollen Queen Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cyflymen · 20.8 km by river above Manley Hall River Station · 2025: 54 spills, 209 h
  • Llangollen WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 20.8 km by river above Manley Hall River Station · 2025: 50 spills, 455 h
  • Off Llangollen Road Cefn-Mawr Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tref-Y-Nant Brook · 14.4 km by river above Manley Hall River Station · 2025: 28 spills, 58 h
  • New Road Wrexham Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tref-Y-Nant Brook · 14.1 km by river above Manley Hall River Station · 2025: 16 spills, 14 h
  • Cefn Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tref-Y-Nant Brook · 13.9 km by river above Manley Hall River Station · 2025: 46 spills, 158 h
  • Pont-Yr-Afon Field Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Eitha · 13.7 km by river above Manley Hall River Station · 2025: 5 spills, 1.5 h
  • Penycae Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Eitha · 13.4 km by river above Manley Hall River Station · 2025: 17 spills, 66 h
  • Trofryn Rhosllanerchrugog Overflow Not discharging
    Dwr Cymru Welsh Water · into River Eitha · 13.2 km by river above Manley Hall River Station · 2025: 13 spills, 27 h
  • Cefn Mawr WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 13.2 km by river above Manley Hall River Station · 2025: 48 spills, 319 h
  • Park Road Rhosymedre Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of The River Dee · 10.8 km by river above Manley Hall River Station · 2025: 11 spills, 16 h
  • Next To Bridge Newbridge Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 10.5 km by river above Manley Hall River Station · 2025: 7 spills, 14 h
  • Paddock Row Ruabon Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into Afon Eitha · 10.4 km by river above Manley Hall River Station · 2025: 7 spills, 21 h
  • Paddock Row Ruabon Storm Overflow No2 Not discharging
    Dwr Cymru Welsh Water · into Afon Eitha · 10.4 km by river above Manley Hall River Station · 2025: 20 spills, 52 h
Ceiriog, above Brynkinalt Weir Chirk River Stationjoins the Dee above Manley Hall River Station6 overflows
  • Y Gamer Glyn Ceiriog Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Ceiriog · 10.7 km by river above Brynkinalt Weir Chirk River Station · 2025: 45 spills, 34 h
  • Glyn Ceiriog WwTW Overflow Not discharging
    Dwr Cymru Welsh Water · into River Ceiriog · 10.4 km by river above Brynkinalt Weir Chirk River Station · 2025: 75 spills, 358 h
  • North West Of Bro-Ddewi Dolywern Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Ceiriog · 8.8 km by river above Brynkinalt Weir Chirk River Station · 2025: 32 spills, 70 h
  • Dolywern WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Ceiriog · 8.6 km by river above Brynkinalt Weir Chirk River Station · 2025: 2 spills, 1.0 h
  • Pontfadog WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Ceiriog · 6.3 km by river above Brynkinalt Weir Chirk River Station · 2025: 19 spills, 80 h
  • Chirk Bank PS Not discharging
    Dwr Cymru Welsh Water · into River Ceiriog · 170 m by river above Brynkinalt Weir Chirk River Station · 2025: 3 spills, 17 h
Between Manley Hall River Station and Farndon3 overflows
Clywedog, above Bowling Bank River Stationjoins the Dee above Farndon23 overflows
Between Farndon and Ironbridge River Station6 overflows
  • Higher Kinnerton Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of The River Dee · 14.6 km by river above Ironbridge River Station · 2025: 14 spills, 89 h · placed on the river by its position alone
  • Holt Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 10.7 km by river above Ironbridge River Station · 2025: 10 spills, 4.5 h
  • Holt WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 10.2 km by river above Ironbridge River Station · no official annual figure
  • Chester Road Pulford Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Pulford Brook · 7.8 km by river above Ironbridge River Station · 2025: 23 spills, 73 h
  • Lavister Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Pulford Brook · 7.3 km by river above Ironbridge River Station · 2025: 116 spills, 1,225 h
  • Lavister WwTW Overflow Not discharging
    Dwr Cymru Welsh Water · into Pulford Brook · 7.3 km by river above Ironbridge River Station · 2025: 69 spills, 888 h
Alun, above Rhyd Y Mwyn DL River Stationjoins the Dee above Ironbridge River Station3 overflows
  • Off Church Terrace Llandegla Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 20.0 km by river above Rhyd Y Mwyn DL River Station · 2025: 5 spills, 14 h
  • Llanarmon Yn Ial WwTW Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 15.4 km by river above Rhyd Y Mwyn DL River Station · 2025: 59 spills, 178 h
  • Llanferres Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Alun · 9.2 km by river above Rhyd Y Mwyn DL River Station · 2025: 6 spills, 59 h
Alun, above Mold Leadmill Bridge River Stationjoins the Dee above Ironbridge River Station1 overflow
  • Maes Y Dre Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 360 m by river above Mold Leadmill Bridge River Station · 2025: 4 spills, 2.0 h
Alun, above Pont Blyddyn River Stationjoins the Dee above Ironbridge River Station9 overflows
  • Bryn Awelon Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Black Brook · 6.8 km by river above Pont Blyddyn River Station · 2025: 12 spills, 68 h
  • Milford Street And Bro Alun Mold Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 6.8 km by river above Pont Blyddyn River Station · 2025: 18 spills, 14 h
  • Bryn Coch Lane Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Unnamed Tributary Of Afon Alyn · 6.4 km by river above Pont Blyddyn River Station · 2025: 0 spills, 0 h
  • Victoria Terrace Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 6.3 km by river above Pont Blyddyn River Station · 2025: 4 spills, 3.3 h
  • Fford Argoed Fields Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into River Alyn · 6.0 km by river above Pont Blyddyn River Station · 2025: 3 spills, 0.8 h
  • Gas Lane Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Unnamed Tributary Of Afon Alyn · 5.7 km by river above Pont Blyddyn River Station · 2025: 10 spills, 5.0 h
  • Bromfield Lane Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Alyn · 5.2 km by river above Pont Blyddyn River Station · 2025: 17 spills, 14 h
  • Mold WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Alyn · 5.0 km by river above Pont Blyddyn River Station · 2025: 56 spills, 359 h
  • Pontblyddyn Dingle Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 320 m by river above Pont Blyddyn River Station · 2025: 3 spills, 27 h
Alun, above Pont Y Capel River Stationjoins the Dee above Ironbridge River Station15 overflows
  • Pontybodkin Main Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Byr · 14.2 km by river above Pont Y Capel River Station · 2025: 1 spill, 0.8 h
  • Buckley Ty Gwyn Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Black Brook · 14.1 km by river above Pont Y Capel River Station · 2025: 18 spills, 127 h
  • Pont Y Bodkin Lower Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into Byr Brook · 14.0 km by river above Pont Y Capel River Station · 2025: 17 spills, 272 h
  • Corwen Road Junction Pontblyddyn Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 12.7 km by river above Pont Y Capel River Station · 2025: 12 spills, 36 h
  • Ffrith Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Cegidog · 8.8 km by river above Pont Y Capel River Station · 2025: 0 spills, 0 h
  • Hope WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 7.9 km by river above Pont Y Capel River Station · 2025: 0 spills, 0 h
  • Sarn Lane Hope Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 7.8 km by river above Pont Y Capel River Station · 2025: 3 spills, 0.8 h
  • Hope Cymau Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Cegidog · 7.6 km by river above Pont Y Capel River Station · 2025: 8 spills, 6.3 h
  • Hope Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 7.1 km by river above Pont Y Capel River Station · 2025: 1 spill, 0.3 h
  • Rhyddyn Hill Caergwrle Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 6.6 km by river above Pont Y Capel River Station · 2025: 13 spills, 36 h
  • East Of Railway Cefn Y Bedd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 5.7 km by river above Pont Y Capel River Station · 2025: 34 spills, 36 h
  • Cefn Y Bedd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 4.5 km by river above Pont Y Capel River Station · 2025: 2 spills, 1.8 h
  • Cherry Tree Road Bradley Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 2.2 km by river above Pont Y Capel River Station · 2025: 21 spills, 39 h
  • Pandy Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alun · 770 m by river above Pont Y Capel River Station · no official annual figure
  • Pandy Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 770 m by river above Pont Y Capel River Station · no official annual figure
Alun, above Rossett River Stationjoins the Dee above Ironbridge River Station2 overflows

Near these gauges, connection not known

Within 3 km of one of the Dee’s gauges in a straight line, but the river map cannot say whether their water reaches it.

  • Holt WwTW Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dee · 1.0 km from Farndon in a straight line · no mapped watercourse close enough to be sure · no official annual figure
  • Outside Corwen WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Unnamed Stream · 1.2 km from Corwen River Station in a straight line · several watercourses close by, nothing to choose between them · 2025: 73 spills, 329 h
  • Corwen Clawdd Poncefn Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of River Dee · 1.3 km from Corwen River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 0 spills, 0 h

2 other overflows within 3 km of these gauges are placed below the Dee’s lowest gauge or on another river, so not listed.

A status is the water company’s own monitor: it says whether an overflow is discharging, never how much or why, and a spill does not by itself explain a change in a river level. A status older than two hours is shown as unknown. Annual figures are the official returns: 12/24-hour spills for England and Wales, overflow events for Scotland (Scottish Water counts differently, so the two cannot be compared). “No data” means the monitor produced no usable data that year, not zero. Overflows are placed on OS Open Rivers (edition 2026-04), which leaves out many small channels: an overflow the map cannot place may still drain here. Contains OS data © Crown copyright and database rights 2026. Sewage in Britain’s rivers →

Live status: © Dŵr Cymru Welsh Water, from its Storm Overflow Map. Annual figures for England: Environment Agency Event Duration Monitoring return, © Environment Agency copyright and/or database right, Open Government Licence v3.0. Annual figures for Wales: Dŵr Cymru Welsh Water’s return to Natural Resources Wales, as compiled by The Rivers Trust, Open Government Licence.

Water samples

Dated samples taken by the Environment Agency, not live readings. Results are published days to months after the sample is taken, and many points are sampled only a few times a year, or have not been sampled for years.

10 sampling points on the Dee and the streams that join it above Ironbridge River Station, and below it. 6 have a sample from the last 12 months; 8 have any sample banked. Listed from the source down, grouped by the next gauge each one's water reaches.

Above Manley Hall River Station Dee 1 point
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Morlas Brook at Pont Y BlewMorlas Brook6.7 km5 Oct 2026 · 22 days agoOxygen 99.6%Temp 12.3 °CpH 8.43Ammonia below 0.03 mg/l
Above Farndon Dee 6 points, 5 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Shell Brook upstream of Kilhendre BrookShell Brook38 kmLast sampled 17 Mar 2020, before the imported period
Shell Brook at Barton's BridgeShell Brook37 km14 Mar 2025 · 19 months agoOxygen 98.3%Temp 6.5 °CpH 8.32Ammonia 0.22 mg/l
Red Brook 100 m downstream from confluence with Stagg BkRed Brook34 km14 Aug 2026 · 2 months agoOxygen 86.5%Temp 18.1 °CpH 7.97Ammonia below 0.03 mg/l
Wych Brook at Lower Wych BridgeWych Brook28 km8 Sep 2026 · 49 days agoOxygen 87.4%Temp 14.4 °CpH 8.2Ammonia 0.047 mg/l
Worthenbury Brook upstream confluence DeeWorthenbury Brook14 km11 May 2026 · 6 months agoOxygen 95.2%Temp 10.2 °CpH 8.17Ammonia 0.035 mg/l
River Dee at A534 Wrexham Road Bridge, HoltRiver Dee1.1 km7 Mar 2025 · 20 months agoOxygen 96.4%Temp 7.8 °CpH 8.13Ammonia 0.13 mg/l
Above Ironbridge River Station Dee 1 point
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
River Dee at Farndon BridgeRiver Dee11 km28 Sep 2026 · 29 days agoOxygen 94.1%Temp 14.4 °CpH 7.78Ammonia 0.061 mg/l
Below Ironbridge River Station 2 points, 1 with samples
Sampling pointWatercourse (map)Below the gaugeLast sampleLatest results (river water)
River Dee near EcclestonRiver Dee2.8 km28 Sep 2026 · 29 days agoOxygen 88.1%Temp 15 °CpH 7.53Ammonia 0.033 mg/l
River Dee 20 m upstream from Chester WeirRiver Dee9.1 kmLast sampled 3 Nov 2008, before the imported period

Distances are along the river to the gauge named. England's samples only.

FloodRadar does not grade these results: there is no overall score, and official river classifications are a separate dataset. A sample taken downstream of an overflow does not by itself show where anything in it came from. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.

Water samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.

Contains OS data © Crown copyright and database rights 2026.

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