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Live levels from 5 monitoring stations across Greater London, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Brent Cross | 0.11 mASD 1h ago | Normal | ||
| 5.5 km by river | ||||
| Brent, Monks Park | 0.24 mASD 1h ago | Normal | ||
| 8.0 km by river | ||||
| Greenford, Costons Lane | 0.29 mASD 1h ago | Normal | ||
| 3.3 km by river | ||||
| Hanwell | 0.92 mASD 1h ago | Normal | ||
| 4.9 km by river | ||||
| Brentfordtidal | 0.19 mASD 2d ago | old reading | ||
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 Brent 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.
Joins the Brent above Brent Cross, its highest gauge, no more than 5.5 km by river above Brent Cross.
| Whetstone | 0.01 mASD 1h ago | Low |
| 1.3 km by river | ||
| North Finchley | 0.26 mASD 1h ago | Normal |
Its water passes every gauge on the Brent, from Brent Cross down.
Joins the Brent between Brent Cross and Brent, Monks Park, no more than 6.0 km by river above Brent, Monks Park.
| Edgware Hospital | 0.65 mASD 1h ago | Normal |
| 3.0 km by river | ||
| Colindalestructure | 0.14 mASD 1h ago | Normal |
Its water passes Brent, Monks Park and every gauge below it on the Brent. It does not pass Brent Cross or the gauges above it.
Joins the Brent between Brent Cross and Brent, Monks Park, no more than 2.1 km by river above Brent, Monks Park.
| Kenton Lanestructure | 0.11 mASD 1h ago | Low |
| downstream, distance by river not measured | ||
| Wembley | 0.08 mASD 1h ago | Normal |
Its water passes Brent, Monks Park and every gauge below it on the Brent. It does not pass Brent Cross or the gauges above it.
Below Brentford, its water next reaches Westminster, a gauge on Thames Tideway, 20.2 km by river downstream.
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.
19 storm overflows are traced upstream of Brentford, the Brent’s lowest gauge on the river map: on the Brent itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Brentford: 174 spills over 467 hours in total, across all 19.
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 Brent includes the smaller streams that join it there.
Within 3 km of one of the Brent’s gauges in a straight line, but the river map cannot say whether their water reaches it.
6 more near these gauges whose connection is not known.
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: © Thames 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.
5 sampling points on the River Brent and the streams that join it above Brentford. 5 have a sample from the last 12 months; 5 have 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) |
|---|---|---|---|---|
| Silk Stream at Silk Bridge, A5, Hendon | Silk Stream | 4.8 km | 12 Aug 2026 · 57 days ago | Oxygen 45.8%Temp 19.1 °CpH 7.79Ammonia 0.3 mg/l |
| Brent at Priestley Way, Hendon | River Brent | 4.1 km | 23 Sep 2026 · 15 days ago | Oxygen 53.7%Temp 18.2 °CpH 7.7Ammonia 0.67 mg/l |
| Brent at Neasden Lane, Wembley | River Brent | 1.9 km | 12 Aug 2026 · 57 days ago | Oxygen 53.7%Temp 20.2 °CpH 7.75Ammonia 0.6 mg/l Jul 2026 |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Brent upstream of Western Avenue, Alperton | River Brent | 4.1 km | 12 Aug 2026 · 57 days ago | Oxygen 72.3%Temp 20.5 °CpH 7.95Ammonia 0.043 mg/l |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Brent at Uxbridge Road, Hanwell | River Brent | 4.9 km | 28 Sep 2026 · 10 days ago | Oxygen 71.8%Temp 16.6 °CpH 7.97Ammonia 0.11 mg/l |
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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