Hamptworth Bridge
EA name: HAMPTWORTH BRIDGE (also listed as “RIVER BLACKWATER AT HAMPTWORTH BRIDGE”)
Environment Agency sampling point SO-G0003996 · 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
- 15 May 2026, 11:525 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
- 23 since 19 Oct 2023 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 422501, 119972As published, to the nearest 1 m. Open in a map
- River, by its own name
- Blackwater
- River, by the map
- River BlackwaterPlaced on the river its name gives, 5 m from the line.
- Next gauge downstream
- Ower On the River Blackwater · 15 km along the riverOWER GS 15 km along the river
- Why it was sampled
- Monitoring (national agency policy) (23 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
92.3%
Sampled 15 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 May 2026, 11:52 | 92.3 | 92.3% |
| 22 Apr 2026, 09:56 | 91 | 91% |
| 5 Mar 2026, 08:04 | 89.3 | 89.3% |
| 12 Feb 2026, 15:45 | 91.9 | 91.9% |
| 7 Jan 2026, 12:21 | 87.8 | 87.8% |
| 17 Mar 2025, 13:37 | 98.5 | 98.5% |
| 24 Feb 2025, 16:43 | 89.3 | 89.3% |
| 27 Jan 2025, 13:18 | 92.4 | 92.4% |
| 11 Dec 2024, 11:08 | 90.6 | 90.6% |
| 25 Nov 2024, 15:45 | 87.7 | 87.7% |
| 28 Oct 2024, 14:07 | 85.9 | 85.9% |
| 16 Sep 2024, 13:09 | 90.3 | 90.3% |
| 28 Aug 2024, 09:11 | 84.2 | 84.2% |
| 31 Jul 2024, 10:44 | 83.6 | 83.6% |
| 17 Jun 2024, 09:57 | 86.9 | 86.9% |
| 13 May 2024, 10:54 | 90.5 | 90.5% |
| 19 Apr 2024, 10:25 | 97.3 | 97.3% |
| 22 Mar 2024, 12:15 | 93.6 | 93.6% |
| 19 Feb 2024, 15:53 | 91.4 | 91.4% |
| 22 Jan 2024, 13:45 | 92.3 | 92.3% |
| 5 Dec 2023, 11:31 | 90.2 | 90.2% |
| 20 Nov 2023, 12:15 | 86.6 | 86.6% |
| 19 Oct 2023, 18:44 | 81.8 | 81.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.4 mg/l
Sampled 15 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 May 2026, 11:52 | 10.4 | 10.4 mg/l |
| 22 Apr 2026, 09:56 | 10.5 | 10.5 mg/l |
| 5 Mar 2026, 08:04 | 11 | 11 mg/l |
| 12 Feb 2026, 15:45 | 10.5 | 10.5 mg/l |
| 7 Jan 2026, 12:21 | 11.8 | 11.8 mg/l |
| 17 Mar 2025, 13:37 | 11.9 | 11.9 mg/l |
| 24 Feb 2025, 16:43 | 9.97 | 9.97 mg/l |
| 27 Jan 2025, 13:18 | 11.3 | 11.3 mg/l |
| 11 Dec 2024, 11:08 | 11 | 11 mg/l |
| 25 Nov 2024, 15:45 | 9.93 | 9.93 mg/l |
| 28 Oct 2024, 14:07 | 9.19 | 9.19 mg/l |
| 16 Sep 2024, 13:09 | 9.45 | 9.45 mg/l |
| 28 Aug 2024, 09:11 | 8.38 | 8.38 mg/l |
| 31 Jul 2024, 10:44 | 7.96 | 7.96 mg/l |
| 17 Jun 2024, 09:57 | 9.24 | 9.24 mg/l |
| 13 May 2024, 10:54 | 9.32 | 9.32 mg/l |
| 19 Apr 2024, 10:25 | 10.8 | 10.8 mg/l |
| 22 Mar 2024, 12:15 | 10.4 | 10.4 mg/l |
| 19 Feb 2024, 15:53 | 10.2 | 10.2 mg/l |
| 22 Jan 2024, 13:45 | 11.1 | 11.1 mg/l |
| 5 Dec 2023, 11:31 | 11 | 11 mg/l |
| 20 Nov 2023, 12:15 | 9.71 | 9.71 mg/l |
| 19 Oct 2023, 18:44 | 8.32 | 8.32 mg/l |
Water temperature
code 0076 · °C
9.9 °C
Sampled 15 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 May 2026, 11:52 | 9.9 | 9.9 °C |
| 22 Apr 2026, 09:56 | 9.2 | 9.2 °C |
| 5 Mar 2026, 08:04 | 6.5 | 6.5 °C |
| 12 Feb 2026, 15:45 | 9.4 | 9.4 °C |
| 7 Jan 2026, 12:21 | 3.1 | 3.1 °C |
| 17 Mar 2025, 13:37 | 7.1 | 7.1 °C |
| 24 Feb 2025, 16:43 | 10.4 | 10.4 °C |
| 27 Jan 2025, 13:18 | 6.6 | 6.6 °C |
| 11 Dec 2024, 11:08 | 7 | 7 °C |
| 25 Nov 2024, 15:45 | 9.8 | 9.8 °C |
| 28 Oct 2024, 14:07 | 12.2 | 12.2 °C |
| 16 Sep 2024, 13:09 | 13.2 | 13.2 °C |
| 28 Aug 2024, 09:11 | 15.5 | 15.5 °C |
| 31 Jul 2024, 10:44 | 17.6 | 17.6 °C |
| 17 Jun 2024, 09:57 | 12.5 | 12.5 °C |
| 13 May 2024, 10:54 | 13.9 | 13.9 °C |
| 19 Apr 2024, 10:25 | 10.6 | 10.6 °C |
| 22 Mar 2024, 12:15 | 10.5 | 10.5 °C |
| 19 Feb 2024, 15:53 | 10.6 | 10.6 °C |
| 22 Jan 2024, 13:45 | 7.3 | 7.3 °C |
| 5 Dec 2023, 11:31 | 6.8 | 6.8 °C |
| 20 Nov 2023, 12:15 | 10.2 | 10.2 °C |
| 19 Oct 2023, 18:44 | 14.5 | 14.5 °C |
pH
code 0061
7.78
Sampled 15 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 May 2026, 11:52 | 7.78 | 7.78 |
| 22 Apr 2026, 09:56 | 7.57 | 7.57 |
| 5 Mar 2026, 08:04 | 7.3 | 7.3 |
| 12 Feb 2026, 15:45 | 7.17 | 7.17 |
| 7 Jan 2026, 12:21 | 7.31 | 7.31 |
| 17 Mar 2025, 13:37 | 7.65 | 7.65 |
| 24 Feb 2025, 16:43 | 7.34 | 7.34 |
| 27 Jan 2025, 13:18 | 7.09 | 7.09 |
| 11 Dec 2024, 11:08 | 7.76 | 7.76 |
| 25 Nov 2024, 15:45 | 7.08 | 7.08 |
| 28 Oct 2024, 14:07 | 7.26 | 7.26 |
| 16 Sep 2024, 13:09 | 7.79 | 7.79 |
| 28 Aug 2024, 09:11 | 7.67 | 7.67 |
| 31 Jul 2024, 10:44 | 7.83 | 7.83 |
| 17 Jun 2024, 09:57 | 7.6 | 7.6 |
| 13 May 2024, 10:54 | 7.7 | 7.7 |
| 19 Apr 2024, 10:25 | 7.53 | 7.53 |
| 22 Mar 2024, 12:15 | 7.75 | 7.75 |
| 19 Feb 2024, 15:53 | 7.25 | 7.25 |
| 22 Jan 2024, 13:45 | 7.78 | 7.78 |
| 5 Dec 2023, 11:31 | 7.21 | 7.21 |
| 20 Nov 2023, 12:15 | 7.27 | 7.27 |
| 19 Oct 2023, 18:44 | 7.22 | 7.22 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 15 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 May 2026, 11:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Apr 2026, 09:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Mar 2026, 08:04 | 0.16 | 0.16 mg/l |
| 12 Feb 2026, 15:45 | 0.14 | 0.14 mg/l |
| 7 Jan 2026, 12:21 | 0.89 | 0.89 mg/l |
| 17 Mar 2025, 13:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Feb 2025, 16:43 | 0.038 | 0.038 mg/l |
| 27 Jan 2025, 13:18 | 0.078 | 0.078 mg/l |
| 11 Dec 2024, 11:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Nov 2024, 15:45 | 0.058 | 0.058 mg/l |
| 28 Oct 2024, 14:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Sep 2024, 13:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Aug 2024, 09:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 31 Jul 2024, 10:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jun 2024, 09:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 May 2024, 10:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Apr 2024, 10:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Mar 2024, 12:15 | 0.043 | 0.043 mg/l |
| 19 Feb 2024, 15:53 | 0.099 | 0.099 mg/l |
| 22 Jan 2024, 13:45 | 0.16 | 0.16 mg/l |
| 5 Dec 2023, 11:31 | 0.16 | 0.16 mg/l |
| 20 Nov 2023, 12:15 | 0.18 | 0.18 mg/l |
| 19 Oct 2023, 18:44 | 0.087 | 0.087 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
8.99 mg/l
Sampled 15 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 May 2026, 11:52 | 8.99 | 8.99 mg/l |
| 22 Apr 2026, 09:56 | 5.29 | 5.29 mg/l |
| 5 Mar 2026, 08:04 | 1.47 | 1.47 mg/l |
| 12 Feb 2026, 15:45 | 0.779 | 0.779 mg/l |
| 7 Jan 2026, 12:21 | 1.85 | 1.85 mg/l |
| 17 Mar 2025, 13:37 | 3.19 | 3.19 mg/l |
| 24 Feb 2025, 16:43 | 0.902 | 0.902 mg/l |
| 27 Jan 2025, 13:18 | 1.09 | 1.09 mg/l |
| 11 Dec 2024, 11:08 | 1.99 | 1.99 mg/l |
| 25 Nov 2024, 15:45 | 0.913 | 0.913 mg/l |
| 28 Oct 2024, 14:07 | 2.19 | 2.19 mg/l |
| 16 Sep 2024, 13:09 | 8.29 | 8.29 mg/l |
| 28 Aug 2024, 09:11 | 5.8 | 5.8 mg/l |
| 31 Jul 2024, 10:44 | 6.49 | 6.49 mg/l |
| 17 Jun 2024, 09:57 | 6.29 | 6.29 mg/l |
| 13 May 2024, 10:54 | 3.29 | 3.29 mg/l |
| 19 Apr 2024, 10:25 | 2.49 | 2.49 mg/l |
| 22 Mar 2024, 12:15 | 1.69 | 1.69 mg/l |
| 19 Feb 2024, 15:53 | 1.09 | 1.09 mg/l |
| 22 Jan 2024, 13:45 | 1.19 | 1.19 mg/l |
| 5 Dec 2023, 11:31 | 0.911 | 0.911 mg/l |
| 20 Nov 2023, 12:15 | 0.886 | 0.886 mg/l |
| 19 Oct 2023, 18:44 | 1.99 | 1.99 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.023 mg/l
Sampled 15 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 May 2026, 11:52 | 0.023 | 0.023 mg/l |
| 22 Apr 2026, 09:56 | 0.026 | 0.026 mg/l |
| 5 Mar 2026, 08:04 | 0.021 | 0.021 mg/l |
| 12 Feb 2026, 15:45 | 0.03 | 0.03 mg/l |
| 7 Jan 2026, 12:21 | 0.068 | 0.068 mg/l |
| 17 Mar 2025, 13:37 | 0.039 | 0.039 mg/l |
| 24 Feb 2025, 16:43 | 0.048 | 0.048 mg/l |
| 27 Jan 2025, 13:18 | 0.051 | 0.051 mg/l |
| 11 Dec 2024, 11:08 | 0.12 | 0.12 mg/l |
| 25 Nov 2024, 15:45 | 0.064 | 0.064 mg/l |
| 28 Oct 2024, 14:07 | 0.18 | 0.18 mg/l |
| 16 Sep 2024, 13:09 | 0.95 | 0.95 mg/l |
| 28 Aug 2024, 09:11 | 0.97 | 0.97 mg/l |
| 31 Jul 2024, 10:44 | 1.1 | 1.1 mg/l |
| 17 Jun 2024, 09:57 | 0.6 | 0.6 mg/l |
| 13 May 2024, 10:54 | 0.28 | 0.28 mg/l |
| 19 Apr 2024, 10:25 | 0.19 | 0.19 mg/l |
| 22 Mar 2024, 12:15 | 0.16 | 0.16 mg/l |
| 19 Feb 2024, 15:53 | 0.076 | 0.076 mg/l |
| 22 Jan 2024, 13:45 | 0.081 | 0.081 mg/l |
| 5 Dec 2023, 11:31 | 0.084 | 0.084 mg/l |
| 20 Nov 2023, 12:15 | 0.07 | 0.07 mg/l |
| 19 Oct 2023, 18:44 | 0.14 | 0.14 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
530 µS/cm
Sampled 15 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 May 2026, 11:52 | 530 | 530 µS/cm |
| 22 Apr 2026, 09:56 | 402 | 402 µS/cm |
| 5 Mar 2026, 08:04 | 253 | 253 µS/cm |
| 12 Feb 2026, 15:45 | 178 | 178 µS/cm |
| 7 Jan 2026, 12:21 | 366 | 366 µS/cm |
| 17 Mar 2025, 13:37 | 323 | 323 µS/cm |
| 24 Feb 2025, 16:43 | 165 | 165 µS/cm |
| 27 Jan 2025, 13:18 | 179 | 179 µS/cm |
| 11 Dec 2024, 11:08 | 274 | 274 µS/cm |
| 25 Nov 2024, 15:45 | 187 | 187 µS/cm |
| 28 Oct 2024, 14:07 | 317 | 317 µS/cm |
| 16 Sep 2024, 13:09 | 588 | 588 µS/cm |
| 28 Aug 2024, 09:11 | 556 | 556 µS/cm |
| 31 Jul 2024, 10:44 | 617 | 617 µS/cm |
| 17 Jun 2024, 09:57 | 455 | 455 µS/cm |
| 13 May 2024, 10:54 | 362 | 362 µS/cm |
| 19 Apr 2024, 10:25 | 296 | 296 µS/cm |
| 22 Mar 2024, 12:15 | 269 | 269 µS/cm |
| 19 Feb 2024, 15:53 | 204 | 204 µS/cm |
| 22 Jan 2024, 13:45 | 219 | 219 µS/cm |
| 5 Dec 2023, 11:31 | 193 | 193 µS/cm |
| 20 Nov 2023, 12:15 | 224 | 224 µS/cm |
| 19 Oct 2023, 18:44 | 277 | 277 µS/cm |
Everything measured here
13 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 13 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 23 | Oct 2023 – May 2026 | 92.3% 15 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 23 | Oct 2023 – May 2026 | 10.4 mg/l 15 May 2026 |
| Temperature of Water 0076 | River water | 23 | Oct 2023 – May 2026 | 9.9 °C 15 May 2026 |
| pH 0061 | River water | 23 | Oct 2023 – May 2026 | 7.78 15 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 23 | Oct 2023 – May 2026 | below 0.03 mg/l 15 May 2026 |
| Nitrate as N 0117 | River water | 23 | Oct 2023 – May 2026 | 8.99 mg/l 15 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 23 | Oct 2023 – May 2026 | 0.023 mg/l 15 May 2026 |
| Conductivity at 25 C 0077 | River water | 23 | Oct 2023 – May 2026 | 530 µS/cm 15 May 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 23 | Oct 2023 – May 2026 | 90 mg/l 15 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 23 | Oct 2023 – May 2026 | below 0.00033 mg/l 15 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 18 | Feb 2024 – May 2026 | 1.1 mg/l 15 May 2026 |
| Nitrite as N 0118 | River water | 23 | Oct 2023 – May 2026 | 0.011 mg/l 15 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 23 | Oct 2023 – May 2026 | 9 mg/l 15 May 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.