Rosea Stream W. Challacombe Lane Bridge
EA name: ROSEA STREAM W. CHALLACOMBE LANE BRIDGE
Environment Agency sampling point SW-73110936 · Freshwater - rivers · listed as open (“open” does not mean it is sampled now)
These are samples taken on a date, not live readings of the river. Results reach the Environment Agency's archive days to months after the sample is taken, so the newest here may be weeks or months old. FloodRadar does not grade them.
Where and when
- Last sampled
- 21 Sep 2026, 12:4810 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 39 since 3 May 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring) · results completed 25 Sep 2026
- Where
- National Grid 258324, 147289As published, to the nearest 1 m. Open in a map
- River, by its own name
- Its name does not give one
- River, by the map
- An unnamed streamPlaced by position alone (the only river line close by), 3 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Why it was sampled
- Planned investigation (local monitoring) (39 samples)
Results here were completed a median of 4 days after the sample was taken (4 to 14 days, 20 samples).
Main measurements, river water
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
81 per 100 ml
Sampled 21 Sep 2026, 10 days ago · 39 results banked
Every result (39)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 12:48 | 81 | 81 per 100 ml |
| 10 Sep 2026, 12:06 | 120 | 120 per 100 ml |
| 5 Sep 2026, 14:54 | 63 | 63 per 100 ml |
| 2 Sep 2026, 11:24 | 140 | 140 per 100 ml |
| 24 Aug 2026, 13:25 | 54 | 54 per 100 ml |
| 13 Aug 2026, 09:53 | 90 | 90 per 100 ml |
| 4 Aug 2026, 11:55 | 27 | 27 per 100 ml |
| 30 Jul 2026, 11:24 | 18 | 18 per 100 ml |
| 20 Jul 2026, 10:55 | 400 | 400 per 100 ml |
| 13 Jul 2026, 12:13 | 360 | 360 per 100 ml |
| 7 Jul 2026, 11:22 | 27 | 27 per 100 ml |
| 2 Jul 2026, 11:06 | 1100 | 1100 per 100 ml |
| 30 Jun 2026, 11:59 | 18 | 18 per 100 ml |
| 25 Jun 2026, 10:41 | 45 | 45 per 100 ml |
| 17 Jun 2026, 13:20 | 110 | 110 per 100 ml |
| 10 Jun 2026, 12:10 | 36 | 36 per 100 ml |
| 7 Jun 2026, 12:19 | <10 | below 10 per 100 ml (not detected above this) |
| 1 Jun 2026, 12:36 | 480 | 480 per 100 ml |
| 28 May 2026, 12:18 | 1500 | 1500 per 100 ml |
| 21 May 2026, 13:13 | 27 | 27 per 100 ml |
| 23 Sep 2024, 11:24 | 72 | 72 per 100 ml |
| 13 Sep 2024, 10:58 | 18 | 18 per 100 ml |
| 9 Sep 2024, 13:33 | 140 | 140 per 100 ml |
| 30 Aug 2024, 12:49 | 45 | 45 per 100 ml |
| 27 Aug 2024, 14:00 | 590 | 590 per 100 ml |
| 15 Aug 2024, 11:45 | 63 | 63 per 100 ml |
| 12 Aug 2024, 11:06 | 150 | 150 per 100 ml |
| 29 Jul 2024, 11:56 | 200 | 200 per 100 ml |
| 25 Jul 2024, 13:01 | 200 | 200 per 100 ml |
| 18 Jul 2024, 11:10 | 36 | 36 per 100 ml |
| 14 Jul 2024, 11:13 | 18 | 18 per 100 ml |
| 11 Jul 2024, 13:10 | 90 | 90 per 100 ml |
| 1 Jul 2024, 13:50 | 36 | 36 per 100 ml |
| 27 Jun 2024, 12:36 | 36 | 36 per 100 ml |
| 18 Jun 2024, 13:02 | 99 | 99 per 100 ml |
| 10 Jun 2024, 12:27 | <10 | below 10 per 100 ml (not detected above this) |
| 28 May 2024, 12:24 | 280 | 280 per 100 ml |
| 16 May 2024, 13:04 | 140 | 140 per 100 ml |
| 3 May 2024, 13:00 | 1000 | 1000 per 100 ml |
Everything measured here
5 determinands, each kept by its code, unit and sample material: results in different units or on different materials are never mixed. A “below” result is under the laboratory's detection limit, not zero.
Show all 5 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Escherichia coli : Confirmed : MF 2348 | River water | 39 | May 2024 – Sep 2026 | 81 per 100 ml 21 Sep 2026 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 38 | May 2024 – Sep 2026 | 90 colony forming units / 100ml 21 Sep 2026 |
| MST Filtration 4926 | River water | 39 | May 2024 – Sep 2026 | DNA Stored 21 Sep 2026 |
| Salinity : In Situ 7608 | River water | 39 | May 2024 – Sep 2026 | 0.19 parts per thousand 21 Sep 2026 |
| Volume of Sample Filtered 4865 | River water | 39 | May 2024 – Sep 2026 | 920 millilitre 21 Sep 2026 |
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.