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Home › Rivers › River Seaton

River Seaton water levels

Live levels from 1 monitoring station across Cornwall, updated every 15 minutes.

1stations
0above typical high

Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
TrebrownbridgeSeaton0.10 m 27m agoLow—

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 Seaton above one of its gauges, from the source down. The river map knows where gauges are, not every stream, so a tributary without a gauge is not listed here.

No gauged tributary joins the Seaton above Trebrownbridge on the river map. Streams without a gauge are not counted here.

Where the Seaton goes

No gauge below Trebrownbridge 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.

Storm overflows upstream

6 storm overflows are traced upstream of Trebrownbridge, the Seaton’s lowest gauge on the river map: on the Seaton itself, on its gauged tributaries, and on smaller streams that join above there.

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

Official figures for 2025, for the overflows traced upstream of Trebrownbridge: 272 spills over 3,043 hours in total, across all 6.

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 Seaton includes the smaller streams that join it there.

Above Trebrownbridge, the Seaton’s highest gauge6 overflows
  • Crowsnest STW Not discharging
    South West Water · into River Seaton (S) · 12.3 km by river above Trebrownbridge · 2025: 40 spills, 184 h
  • St Cleer Wastewater Treatment Works Not discharging
    South West Water · into Tremar Stream · 11.3 km by river above Trebrownbridge · 2025: 67 spills, 1,096 h · placed on the river by its position alone
  • Scawns Hill CSO Not discharging bathing water
    South West Water · into Tributary Of The River Seaton · 4.5 km by river above Trebrownbridge · 2025: 10 spills, 25 h
  • Church Square CSO Not discharging bathing water
    South West Water · into Tributary Of The River Seaton · 3.8 km by river above Trebrownbridge · 2025: 12 spills, 57 h
  • Factory Houses Pumping Station Not discharging bathing water
    South West Water · into Tributary Of The River Seaton · 3.4 km by river above Trebrownbridge · 2025: 12 spills, 107 h
  • Menheniot WwTW Not discharging bathing water
    South West Water · into Tributary Of The River Seaton · 3.4 km by river above Trebrownbridge · 2025: 131 spills, 1,575 h

1 other overflow within 3 km of these gauges is placed below the Seaton’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: © South West Water storm overflow activity data, licensed under CC BY 4.0. Annual figures for England: Environment Agency Event Duration Monitoring return, © Environment Agency copyright and/or database right, Open Government Licence v3.0.

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.

25 sampling points on the River Seaton and the streams that join it above Trebrownbridge, and below it. 3 have a sample from the last 12 months; 10 have any sample banked. Listed from the source down, grouped by the next gauge each one's water reaches.

Above Trebrownbridge River Seaton 19 points, 8 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
River Seaton upstream of Crows Nest sewage treatment worksRiver Seaton12 km18 May 2026 · 5 months agoOxygen 99.7%Temp 11.3 °CpH 6.56Ammonia below 0.03 mg/l
River Seaton downstream of Crows Nest sewage treatment worksRiver Seaton12 kmLast sampled 20 Sep 2005, before the imported period
Tremar Stream upstream of St Cleer sewage treatment worksunnamed stream11 km14 Mar 2025 · 19 months agoOxygen 99.5%Temp 9.9 °CpH 7.25Ammonia below 0.03 mg/l
Tremar Stream downstream of St Cleer sewage treatment worksunnamed stream11 km14 Mar 2025 · 19 months agoOxygen 97.1%Temp 10 °CpH 7.1Ammonia 0.19 mg/l
River Seaton upstream of RosecraddocRiver Seaton11 kmLast sampled 23 Oct 2014, before the imported period
Tremar Stream at Rosecraddocunnamed stream11 kmLast sampled 23 Oct 2014, before the imported period
River Seaton downstream of RosecraddocRiver Seaton10 kmLast sampled 23 Oct 2014, before the imported period
River Seaton at Hendra BridgeRiver Seaton8.4 km17 Mar 2025 · 19 months agoOxygen 100.7%Temp 9.3 °CpH 7.3Conductivity 150 µS/cm
River Seaton at RoselandRiver Seaton5.4 kmLast sampled 20 Sep 2013, before the imported period
Menheniot Stream upstream of Scawn Lodge CSOunnamed stream4.5 kmLast sampled 1 Jul 2010, before the imported period
Menheniot Stream upstream of CSOunnamed stream3.9 kmLast sampled 15 May 2010, before the imported period
Tributary of Seaton above Trouts MillRiver Seaton3.7 kmLast sampled 23 Jun 2011, before the imported period
Menheniot Stream upstream of Menheniot sewage treatment worksunnamed stream3.7 kmLast sampled 20 Sep 2012, before the imported period
Menheniot Stream downstream of Menheniot sewage treatment worksunnamed stream3.6 km14 Feb 2024 · 2.6 years agopH 7.56
Menheniot Stream upstream of Factoryunnamed stream3.5 kmLast sampled 20 Nov 2007, before the imported period
River Seaton upstream of Trouts MillRiver Seaton3.4 km27 Mar 2025 · 18 months agoOxygen 98.9%Temp 9.7 °CpH 7.87Ammonia below 0.03 mg/l
River Seaton downstream of Trouts MillRiver Seaton3.2 km27 Mar 2025 · 18 months agoOxygen 98.6%Temp 9.7 °CpH 7.83Ammonia below 0.03 mg/l
River Seaton at Courtneys Mill BridgeRiver Seaton2.8 kmLast sampled 23 Mar 2017, before the imported period
Trethew Stream at Trebrownbridgeunnamed stream0.3 km14 Aug 2026 · 55 days agoOxygen 95.3%Temp 19.6 °CpH 7.66Ammonia below 0.03 mg/l
Below Trebrownbridge 6 points, 2 with samples
Sampling pointWatercourse (map)Below the gaugeLast sampleLatest results (river water)
Tributary of Seaton from BonyalvaRiver Seaton1.2 kmLast sampled 1 Jul 2010, before the imported period
River Seaton upstream of HessenfordRiver Seaton2.1 kmLast sampled 25 Sep 2015, before the imported period
River Seaton at HessenfordRiver Seaton2.5 kmLast sampled 20 Jul 2007, before the imported period
River Seaton downstream of Hessenford BridgeRiver Seaton2.7 km17 Mar 2025 · 19 months agoOxygen 103.2%Temp 9 °CpH 7.84Ammonia below 0.03 mg/l
River Seaton at Seaton BeachRiver Seaton5.9 km12 May 2026 · 5 months agoOxygen 94.1%Temp 11.2 °CpH 7.7Ammonia 0.031 mg/l
River Seaton at Beach downstream of Road BridgeRiver Seaton6.0 kmLast sampled 18 Sep 2019, 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.

Wave tracker for this river → Cornwall rivers → All UK rivers