Gunpowder Works
EA name: GUNPOWDER WORKS (also listed as “RSN2165 GUNPOWDER WORKS”)
Environment Agency sampling point TH-RSN2165 · 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
- 5 Dec 2025, 15:4510 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 30 Sep 2026 and had nothing newer.
- Samples banked
- 24 since 9 Jan 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 503165, 147511As 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
- Tilling BournePlaced by position alone, on a line whose map name differs from its own, 2 m from the line.
- Next gauge downstream
- Shalford On the River Tillingbourne · 3.9 km along the river
- Nearest gauge upstream
- Albury On the Law Brook · 2.7 km along the river
- Why it was sampled
- Monitoring (national agency policy) (24 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
86.5%
Sampled 5 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 15:45 | 86.5 | 86.5% |
| 19 Nov 2025, 13:20 | 79.5 | 79.5% |
| 7 Oct 2025, 16:47 | 84.2 | 84.2% |
| 19 Sep 2025, 16:25 | 86.3 | 86.3% |
| 18 Aug 2025, 16:18 | 82.7 | 82.7% |
| 11 Jul 2025, 16:53 | 87.4 | 87.4% |
| 5 Jun 2025, 15:44 | 87.7 | 87.7% |
| 8 May 2025, 16:02 | 96.2 | 96.2% |
| 3 Apr 2025, 15:18 | 107.2 | 107.2% |
| 13 Mar 2025, 15:25 | 98.8 | 98.8% |
| 13 Feb 2025, 11:57 | 92 | 92% |
| 7 Jan 2025, 13:43 | 90.7 | 90.7% |
| 2 Dec 2024, 15:29 | 82.2 | 82.2% |
| 5 Nov 2024, 13:40 | 72.9 | 72.9% |
| 17 Oct 2024, 15:15 | 77.9 | 77.9% |
| 26 Sep 2024, 16:54 | 82.6 | 82.6% |
| 27 Aug 2024, 14:05 | 88.2 | 88.2% |
| 3 Jul 2024, 16:01 | 91.5 | 91.5% |
| 5 Jun 2024, 16:42 | 92.8 | 92.8% |
| 8 May 2024, 17:01 | 95 | 95% |
| 10 Apr 2024, 14:06 | 102 | 102% |
| 7 Mar 2024, 14:16 | 96.6 | 96.6% |
| 7 Feb 2024, 11:12 | 93.2 | 93.2% |
| 9 Jan 2024, 14:17 | 92.6 | 92.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.8 mg/l
Sampled 5 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 15:45 | 10.8 | 10.8 mg/l |
| 19 Nov 2025, 13:20 | 10.1 | 10.1 mg/l |
| 7 Oct 2025, 16:47 | 8.93 | 8.93 mg/l |
| 19 Sep 2025, 16:25 | 8.44 | 8.44 mg/l |
| 18 Aug 2025, 16:18 | 8 | 8 mg/l |
| 11 Jul 2025, 16:53 | 7.93 | 7.93 mg/l |
| 5 Jun 2025, 15:44 | 9.11 | 9.11 mg/l |
| 8 May 2025, 16:02 | 10.2 | 10.2 mg/l |
| 3 Apr 2025, 15:18 | 11 | 11 mg/l |
| 13 Mar 2025, 15:25 | 11.6 | 11.6 mg/l |
| 13 Feb 2025, 11:57 | 11.4 | 11.4 mg/l |
| 7 Jan 2025, 13:43 | 11.5 | 11.5 mg/l |
| 2 Dec 2024, 15:29 | 9.39 | 9.39 mg/l |
| 5 Nov 2024, 13:40 | 8.13 | 8.13 mg/l |
| 17 Oct 2024, 15:15 | 7.99 | 7.99 mg/l |
| 26 Sep 2024, 16:54 | 8.42 | 8.42 mg/l |
| 27 Aug 2024, 14:05 | 8.66 | 8.66 mg/l |
| 3 Jul 2024, 16:01 | 9.36 | 9.36 mg/l |
| 5 Jun 2024, 16:42 | 9.64 | 9.64 mg/l |
| 8 May 2024, 17:01 | 9.49 | 9.49 mg/l |
| 10 Apr 2024, 14:06 | 11.2 | 11.2 mg/l |
| 7 Mar 2024, 14:16 | 11.3 | 11.3 mg/l |
| 7 Feb 2024, 11:12 | 10.9 | 10.9 mg/l |
| 9 Jan 2024, 14:17 | 11.9 | 11.9 mg/l |
Water temperature
code 0076 · °C
5.8 °C
Sampled 5 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 15:45 | 5.8 | 5.8 °C |
| 19 Nov 2025, 13:20 | 5 | 5 °C |
| 7 Oct 2025, 16:47 | 12.6 | 12.6 °C |
| 19 Sep 2025, 16:25 | 16.3 | 16.3 °C |
| 18 Aug 2025, 16:18 | 16.8 | 16.8 °C |
| 11 Jul 2025, 16:53 | 20 | 20 °C |
| 5 Jun 2025, 15:44 | 13.5 | 13.5 °C |
| 8 May 2025, 16:02 | 12.8 | 12.8 °C |
| 3 Apr 2025, 15:18 | 14 | 14 °C |
| 13 Mar 2025, 15:25 | 8.3 | 8.3 °C |
| 13 Feb 2025, 11:57 | 6 | 6 °C |
| 7 Jan 2025, 13:43 | 5.1 | 5.1 °C |
| 2 Dec 2024, 15:29 | 9.4 | 9.4 °C |
| 5 Nov 2024, 13:40 | 10.4 | 10.4 °C |
| 17 Oct 2024, 15:15 | 14.1 | 14.1 °C |
| 26 Sep 2024, 16:54 | 14.4 | 14.4 °C |
| 27 Aug 2024, 14:05 | 16.1 | 16.1 °C |
| 3 Jul 2024, 16:01 | 14.2 | 14.2 °C |
| 5 Jun 2024, 16:42 | 13.5 | 13.5 °C |
| 8 May 2024, 17:01 | 15.3 | 15.3 °C |
| 10 Apr 2024, 14:06 | 11 | 11 °C |
| 7 Mar 2024, 14:16 | 8.5 | 8.5 °C |
| 7 Feb 2024, 11:12 | 8.4 | 8.4 °C |
| 9 Jan 2024, 14:17 | 4.7 | 4.7 °C |
pH
code 0061
7.25
Sampled 5 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 15:45 | 7.25 | 7.25 |
| 19 Nov 2025, 13:20 | 7.22 | 7.22 |
| 7 Oct 2025, 16:47 | 7.35 | 7.35 |
| 19 Sep 2025, 16:25 | 7.43 | 7.43 |
| 18 Aug 2025, 16:18 | 7.37 | 7.37 |
| 11 Jul 2025, 16:53 | 7.39 | 7.39 |
| 5 Jun 2025, 15:44 | 7.47 | 7.47 |
| 8 May 2025, 16:02 | 7.6 | 7.6 |
| 3 Apr 2025, 15:18 | 7.78 | 7.78 |
| 13 Mar 2025, 15:25 | 7.62 | 7.62 |
| 13 Feb 2025, 11:57 | 7.3 | 7.3 |
| 7 Jan 2025, 13:43 | 7.31 | 7.31 |
| 2 Dec 2024, 15:29 | 7.3 | 7.3 |
| 5 Nov 2024, 13:40 | 7.18 | 7.18 |
| 17 Oct 2024, 15:15 | 7.27 | 7.27 |
| 26 Sep 2024, 16:54 | 7.35 | 7.35 |
| 27 Aug 2024, 14:05 | 7.54 | 7.54 |
| 3 Jul 2024, 16:01 | 7.95 | 7.95 |
| 5 Jun 2024, 16:42 | 7.55 | 7.55 |
| 8 May 2024, 17:01 | 7.48 | 7.48 |
| 10 Apr 2024, 14:06 | 7.66 | 7.66 |
| 7 Mar 2024, 14:16 | 7.35 | 7.35 |
| 7 Feb 2024, 11:12 | 7.6 | 7.6 |
| 9 Jan 2024, 14:17 | 7.41 | 7.41 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 5 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 15:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Nov 2025, 13:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Oct 2025, 16:47 | 0.031 | 0.031 mg/l |
| 19 Sep 2025, 16:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Aug 2025, 16:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Jul 2025, 16:53 | 0.056 | 0.056 mg/l |
| 5 Jun 2025, 15:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 May 2025, 16:02 | 0.041 | 0.041 mg/l |
| 3 Apr 2025, 15:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Mar 2025, 15:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Feb 2025, 11:57 | 0.043 | 0.043 mg/l |
| 7 Jan 2025, 13:43 | 0.038 | 0.038 mg/l |
| 2 Dec 2024, 15:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Nov 2024, 13:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Oct 2024, 15:15 | 0.03 | 0.03 mg/l |
| 26 Sep 2024, 16:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Aug 2024, 14:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jul 2024, 16:01 | 0.031 | 0.031 mg/l |
| 5 Jun 2024, 16:42 | 0.037 | 0.037 mg/l |
| 8 May 2024, 17:01 | 0.036 | 0.036 mg/l |
| 10 Apr 2024, 14:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Mar 2024, 14:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Feb 2024, 11:12 | 0.061 | 0.061 mg/l |
| 9 Jan 2024, 14:17 | 0.043 | 0.043 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
2.89 mg/l
Sampled 5 Dec 2025, 10 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 15:45 | 2.89 | 2.89 mg/l |
| 19 Nov 2025, 13:20 | 2.4 | 2.4 mg/l |
| 7 Oct 2025, 16:47 | 3.89 | 3.89 mg/l |
| 19 Sep 2025, 16:25 | 3.89 | 3.89 mg/l |
| 18 Aug 2025, 16:18 | 3.49 | 3.49 mg/l |
| 11 Jul 2025, 16:53 | 3.67 | 3.67 mg/l |
| 5 Jun 2025, 15:44 | 3.99 | 3.99 mg/l |
| 8 May 2025, 16:02 | 4.18 | 4.18 mg/l |
| 3 Apr 2025, 15:18 | 4.59 | 4.59 mg/l |
| 13 Mar 2025, 15:25 | 4.29 | 4.29 mg/l |
| 13 Feb 2025, 11:57 | 4.18 | 4.18 mg/l |
| 7 Jan 2025, 13:43 | 2.99 | 2.99 mg/l |
| 5 Nov 2024, 13:40 | 3.28 | 3.28 mg/l |
| 17 Oct 2024, 15:15 | 2.69 | 2.69 mg/l |
| 26 Sep 2024, 16:54 | 2.39 | 2.39 mg/l |
| 27 Aug 2024, 14:05 | 3.59 | 3.59 mg/l |
| 3 Jul 2024, 16:01 | 3.98 | 3.98 mg/l |
| 5 Jun 2024, 16:42 | 4.37 | 4.37 mg/l |
| 8 May 2024, 17:01 | 3.78 | 3.78 mg/l |
| 10 Apr 2024, 14:06 | 3.79 | 3.79 mg/l |
| 7 Mar 2024, 14:16 | 3.29 | 3.29 mg/l |
| 7 Feb 2024, 11:12 | 3.97 | 3.97 mg/l |
| 9 Jan 2024, 14:17 | 3.48 | 3.48 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.15 mg/l
Sampled 5 Dec 2025, 10 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 15:45 | 0.15 | 0.15 mg/l |
| 19 Nov 2025, 13:20 | 0.14 | 0.14 mg/l |
| 7 Oct 2025, 16:47 | 0.22 | 0.22 mg/l |
| 19 Sep 2025, 16:25 | 0.23 | 0.23 mg/l |
| 18 Aug 2025, 16:18 | 0.2 | 0.2 mg/l |
| 11 Jul 2025, 16:53 | 0.27 | 0.27 mg/l |
| 5 Jun 2025, 15:44 | 0.24 | 0.24 mg/l |
| 8 May 2025, 16:02 | 0.27 | 0.27 mg/l |
| 3 Apr 2025, 15:18 | 0.24 | 0.24 mg/l |
| 13 Mar 2025, 15:25 | 0.23 | 0.23 mg/l |
| 13 Feb 2025, 11:57 | 0.19 | 0.19 mg/l |
| 7 Jan 2025, 13:43 | 0.16 | 0.16 mg/l |
| 2 Dec 2024, 15:29 | 0.18 | 0.18 mg/l |
| 5 Nov 2024, 13:40 | 0.082 | 0.082 mg/l |
| 17 Oct 2024, 15:15 | 0.15 | 0.15 mg/l |
| 26 Sep 2024, 16:54 | 0.18 | 0.18 mg/l |
| 27 Aug 2024, 14:05 | 0.17 | 0.17 mg/l |
| 3 Jul 2024, 16:01 | 0.2 | 0.2 mg/l |
| 5 Jun 2024, 16:42 | 0.22 | 0.22 mg/l |
| 8 May 2024, 17:01 | 0.24 | 0.24 mg/l |
| 10 Apr 2024, 14:06 | 0.23 | 0.23 mg/l |
| 7 Mar 2024, 14:16 | 0.21 | 0.21 mg/l |
| 9 Jan 2024, 14:17 | 0.21 | 0.21 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
272 µS/cm
Sampled 5 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 15:45 | 272 | 272 µS/cm |
| 19 Nov 2025, 13:20 | 274 | 274 µS/cm |
| 7 Oct 2025, 16:47 | 254 | 254 µS/cm |
| 19 Sep 2025, 16:25 | 259 | 259 µS/cm |
| 18 Aug 2025, 16:18 | 256 | 256 µS/cm |
| 11 Jul 2025, 16:53 | 258 | 258 µS/cm |
| 5 Jun 2025, 15:44 | 255 | 255 µS/cm |
| 8 May 2025, 16:02 | 259 | 259 µS/cm |
| 3 Apr 2025, 15:18 | 255 | 255 µS/cm |
| 13 Mar 2025, 15:25 | 250 | 250 µS/cm |
| 13 Feb 2025, 11:57 | 253 | 253 µS/cm |
| 7 Jan 2025, 13:43 | 231 | 231 µS/cm |
| 2 Dec 2024, 15:29 | 243 | 243 µS/cm |
| 5 Nov 2024, 13:40 | 257 | 257 µS/cm |
| 17 Oct 2024, 15:15 | 251 | 251 µS/cm |
| 26 Sep 2024, 16:54 | 244 | 244 µS/cm |
| 27 Aug 2024, 14:05 | 257 | 257 µS/cm |
| 3 Jul 2024, 16:01 | 262 | 262 µS/cm |
| 5 Jun 2024, 16:42 | 258 | 258 µS/cm |
| 8 May 2024, 17:01 | 248 | 248 µS/cm |
| 10 Apr 2024, 14:06 | 241 | 241 µS/cm |
| 7 Mar 2024, 14:16 | 228 | 228 µS/cm |
| 7 Feb 2024, 11:12 | 250 | 250 µS/cm |
| 9 Jan 2024, 14:17 | 230 | 230 µS/cm |
Everything measured here
19 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 19 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 24 | Jan 2024 – Dec 2025 | 86.5% 5 Dec 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 24 | Jan 2024 – Dec 2025 | 10.8 mg/l 5 Dec 2025 |
| Temperature of Water 0076 | River water | 24 | Jan 2024 – Dec 2025 | 5.8 °C 5 Dec 2025 |
| pH 0061 | River water | 24 | Jan 2024 – Dec 2025 | 7.25 5 Dec 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 24 | Jan 2024 – Dec 2025 | below 0.03 mg/l 5 Dec 2025 |
| Nitrate as N 0117 | River water | 23 | Jan 2024 – Dec 2025 | 2.89 mg/l 5 Dec 2025 |
| Orthophosphate, reactive as P 0180 | River water | 23 | Jan 2024 – Dec 2025 | 0.15 mg/l 5 Dec 2025 |
| Conductivity at 25 C 0077 | River water | 24 | Jan 2024 – Dec 2025 | 272 µS/cm 5 Dec 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 24 | Jan 2024 – Dec 2025 | 58 mg/l 5 Dec 2025 |
| Ammonia un-ionised as N 0119 | River water | 24 | Jan 2024 – Dec 2025 | below 0.00007 mg/l 5 Dec 2025 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 23 | Jan 2024 – Dec 2025 | 3.9 mg/l 5 Dec 2025 |
| Chloride 0172 | River water | 24 | Jan 2024 – Dec 2025 | 23 mg/l 5 Dec 2025 |
| Flow Type 2896 | River water | 17 | Jul 2024 – Dec 2025 | Moderate Flow 5 Dec 2025 |
| Nitrite as N 0118 | River water | 23 | Jan 2024 – Dec 2025 | 0.0091 mg/l 5 Dec 2025 |
| Nitrogen, Total as N 9686 | River water | 24 | Jan 2024 – Dec 2025 | 3.3 mg/l 5 Dec 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 24 | Jan 2024 – Dec 2025 | 2.9 mg/l 5 Dec 2025 |
| Phosphorus, Total as P 0348 | River water | 24 | Jan 2024 – Dec 2025 | 0.17 mg/l 5 Dec 2025 |
| Silica, reactive as SiO2 0182 | River water | 24 | Jan 2024 – Dec 2025 | 14 mg/l 5 Dec 2025 |
| Solids, Suspended at 105 C 0135 | River water | 1 | Dec 2025 – Dec 2025 | below 3 mg/l 5 Dec 2025 |
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.