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Live levels from 2 monitoring stations across Cornwall, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Molingey | 0.61 m 43m ago | Normal | ||
| downstream, distance by river not measured | ||||
| Pentewanstructure | 1.17 m 43m ago | Normal | ||
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.
Streams and rivers with a gauge whose water joins the St Austell River 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 St Austell River above Pentewan on the river map. Streams without a gauge are not counted here.
No gauge below Pentewan 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.
1 storm overflow is traced upstream of Pentewan, the St Austell River’s lowest gauge on the river map: on the St Austell River itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflow traced upstream of Pentewan: 2 spills over 1.2 hours.
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 St Austell River includes the smaller streams that join it there.
Within 3 km of one of the St Austell River’s gauges in a straight line, but the river map cannot say whether their water reaches it.
1 other overflow within 3 km of these gauges is placed below the St Austell River’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.
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.
4 sampling points on the St Austell River and the streams that join it above Pentewan. 1 has a sample from the last 12 months; 1 has any sample banked. Listed from the source down, grouped by the next gauge each one's water reaches.
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Gover Stream Prior to St Austell River | Gover Stream | 3.6 km | Last sampled 1 May 2014, before the imported period | |
| Upstream of Blackpool Dryers 18/14 | unnamed stream | 3.6 km | Last sampled 19 Mar 2002, before the imported period | |
| Polgooth Stream at St Margarets | Polgooth Stream | 1.5 km | Last sampled 11 Oct 2013, before the imported period | |
| Polgooth Stream upstream of St Austell River | Polgooth Stream | 0.3 km | 3 Sep 2026 · 35 days ago | Oxygen 95.4% Jun 2026Temp 12.7 °C Jun 2026pH 7.09 Jun 2026Ammonia 0.14 mg/l Jun 2026 |
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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