Blackwater River upstream of Hawkchurch sewage treatment works
EA name: BLACKWATER RIVER U/S HAWKCHURCH STW (also listed as “BLACKWATER RIVER ABOVE HAWKCHURCH STW”)
Environment Agency sampling point SW-70230913 · 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
- 18 May 2026, 13:364 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
- 30 since 23 Jul 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 334320, 101480As published, to the nearest 10 m. Open in a map
- River, by its own name
- Blackwater
- River, by the map
- Blackwater RiverPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Weycroft Bridge On the River Axe · 7.3 km along the river
- Why it was sampled
- Monitoring (national agency policy) (30 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98%
Sampled 18 May 2026, 4 months ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 13:36 | 98 | 98% |
| 7 May 2026, 14:26 | 100.3 | 100.3% |
| 20 Apr 2026, 10:34 | 100.9 | 100.9% |
| 8 Apr 2026, 12:24 | 106 | 106% |
| 24 Mar 2026, 10:41 | 100.4 | 100.4% |
| 5 Mar 2026, 13:13 | 97.9 | 97.9% |
| 25 Feb 2026, 10:12 | 98.2 | 98.2% |
| 9 Feb 2026, 14:35 | 98.4 | 98.4% |
| 21 Jan 2026, 11:13 | 98.7 | 98.7% |
| 15 Dec 2025, 11:55 | 99.2 | 99.2% |
| 3 Dec 2025, 13:12 | 99.8 | 99.8% |
| 21 Nov 2025, 15:58 | 98.6 | 98.6% |
| 14 Nov 2025, 13:23 | 94.2 | 94.2% |
| 10 Oct 2025, 13:25 | 92 | 92% |
| 9 Sep 2025, 12:38 | 95.4 | 95.4% |
| 22 Aug 2025, 12:55 | 95.3 | 95.3% |
| 1 Jul 2025, 12:35 | 96.1 | 96.1% |
| 6 Jun 2025, 11:35 | 97.2 | 97.2% |
| 13 May 2025, 11:06 | 97.8 | 97.8% |
| 24 Apr 2025, 10:44 | 103.3 | 103.3% |
| 7 Mar 2025, 12:18 | 99 | 99% |
| 11 Feb 2025, 12:37 | 99.4 | 99.4% |
| 23 Jan 2025, 13:49 | 100.2 | 100.2% |
| 10 Dec 2024, 11:07 | 96.8 | 96.8% |
| 26 Nov 2024, 12:35 | 99.5 | 99.5% |
| 23 Sep 2024, 16:22 | 96.5 | 96.5% |
| 22 Aug 2024, 11:59 | 94.6 | 94.6% |
| 30 Jul 2024, 09:35 | 97.8 | 97.8% |
| 23 Jul 2024, 13:37 | 97.3 | 97.3% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.8 mg/l
Sampled 18 May 2026, 4 months ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 13:36 | 10.8 | 10.8 mg/l |
| 7 May 2026, 14:26 | 11 | 11 mg/l |
| 20 Apr 2026, 10:34 | 11.7 | 11.7 mg/l |
| 8 Apr 2026, 12:24 | 11.5 | 11.5 mg/l |
| 24 Mar 2026, 10:41 | 11.6 | 11.6 mg/l |
| 5 Mar 2026, 13:13 | 11.3 | 11.3 mg/l |
| 25 Feb 2026, 10:12 | 11.4 | 11.4 mg/l |
| 9 Feb 2026, 14:35 | 11.4 | 11.4 mg/l |
| 21 Jan 2026, 11:13 | 11.8 | 11.8 mg/l |
| 15 Dec 2025, 11:55 | 11.1 | 11.1 mg/l |
| 3 Dec 2025, 13:12 | 11.7 | 11.7 mg/l |
| 21 Nov 2025, 15:58 | 12.6 | 12.6 mg/l |
| 14 Nov 2025, 13:23 | 9.95 | 9.95 mg/l |
| 10 Oct 2025, 13:25 | 9.94 | 9.94 mg/l |
| 9 Sep 2025, 12:38 | 9.81 | 9.81 mg/l |
| 22 Aug 2025, 12:55 | 9.82 | 9.82 mg/l |
| 1 Jul 2025, 12:35 | 9.13 | 9.13 mg/l |
| 6 Jun 2025, 11:35 | 10.2 | 10.2 mg/l |
| 13 May 2025, 11:06 | 10.5 | 10.5 mg/l |
| 24 Apr 2025, 10:44 | 11.5 | 11.5 mg/l |
| 7 Mar 2025, 12:18 | 11.5 | 11.5 mg/l |
| 11 Feb 2025, 12:37 | 12.5 | 12.5 mg/l |
| 23 Jan 2025, 13:49 | 12.4 | 12.4 mg/l |
| 10 Dec 2024, 11:07 | 11.6 | 11.6 mg/l |
| 26 Nov 2024, 12:35 | 11.8 | 11.8 mg/l |
| 23 Sep 2024, 16:22 | 9.75 | 9.75 mg/l |
| 22 Aug 2024, 11:59 | 9.54 | 9.54 mg/l |
| 30 Jul 2024, 09:35 | 9.86 | 9.86 mg/l |
| 23 Jul 2024, 13:37 | 9.54 | 9.54 mg/l |
Water temperature
code 0076 · °C
10.8 °C
Sampled 18 May 2026, 4 months ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 13:36 | 10.8 | 10.8 °C |
| 7 May 2026, 14:26 | 11 | 11 °C |
| 20 Apr 2026, 10:34 | 8.7 | 8.7 °C |
| 8 Apr 2026, 12:24 | 11.6 | 11.6 °C |
| 24 Mar 2026, 10:41 | 9.1 | 9.1 °C |
| 5 Mar 2026, 13:13 | 9 | 9 °C |
| 25 Feb 2026, 10:12 | 8.8 | 8.8 °C |
| 9 Feb 2026, 14:35 | 8.8 | 8.8 °C |
| 21 Jan 2026, 11:13 | 7.6 | 7.6 °C |
| 15 Dec 2025, 11:55 | 10.3 | 10.3 °C |
| 3 Dec 2025, 13:12 | 8.2 | 8.2 °C |
| 21 Nov 2025, 15:58 | 5 | 5 °C |
| 14 Nov 2025, 13:23 | 12.8 | 12.8 °C |
| 10 Oct 2025, 13:25 | 11.8 | 11.8 °C |
| 9 Sep 2025, 12:38 | 14 | 14 °C |
| 22 Aug 2025, 12:55 | 13.9 | 13.9 °C |
| 1 Jul 2025, 12:35 | 17.7 | 17.7 °C |
| 6 Jun 2025, 11:35 | 13.2 | 13.2 °C |
| 13 May 2025, 11:06 | 12 | 12 °C |
| 24 Apr 2025, 10:44 | 10.4 | 10.4 °C |
| 7 Mar 2025, 12:18 | 8.6 | 8.6 °C |
| 11 Feb 2025, 12:37 | 5.5 | 5.5 °C |
| 23 Jan 2025, 13:49 | 6.3 | 6.3 °C |
| 10 Dec 2024, 11:07 | 7.3 | 7.3 °C |
| 26 Nov 2024, 12:35 | 8 | 8 °C |
| 23 Sep 2024, 16:22 | 14.8 | 14.8 °C |
| 22 Aug 2024, 11:59 | 14.9 | 14.9 °C |
| 30 Jul 2024, 09:35 | 14.9 | 14.9 °C |
| 23 Jul 2024, 13:37 | 16.2 | 16.2 °C |
pH
code 0061
8.1
Sampled 18 May 2026, 4 months ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 13:36 | 8.1 | 8.1 |
| 7 May 2026, 14:26 | 8.1 | 8.1 |
| 20 Apr 2026, 10:34 | 7.95 | 7.95 |
| 8 Apr 2026, 12:24 | 8.09 | 8.09 |
| 24 Mar 2026, 10:41 | 7.84 | 7.84 |
| 5 Mar 2026, 13:13 | 7.85 | 7.85 |
| 25 Feb 2026, 10:12 | 7.68 | 7.68 |
| 9 Feb 2026, 14:35 | 7.59 | 7.59 |
| 21 Jan 2026, 11:13 | 7.35 | 7.35 |
| 15 Dec 2025, 11:55 | 7.71 | 7.71 |
| 3 Dec 2025, 13:12 | 7.51 | 7.51 |
| 21 Nov 2025, 15:58 | 7.75 | 7.75 |
| 14 Nov 2025, 13:23 | 7.46 | 7.46 |
| 10 Oct 2025, 13:25 | 7.75 | 7.75 |
| 9 Sep 2025, 12:38 | 7.62 | 7.62 |
| 22 Aug 2025, 12:55 | 7.97 | 7.97 |
| 1 Jul 2025, 12:35 | 7.88 | 7.88 |
| 6 Jun 2025, 11:35 | 7.92 | 7.92 |
| 13 May 2025, 11:06 | 8.42 | 8.42 |
| 24 Apr 2025, 10:44 | 7.71 | 7.71 |
| 7 Mar 2025, 12:18 | 7.93 | 7.93 |
| 11 Feb 2025, 12:37 | 7.82 | 7.82 |
| 23 Jan 2025, 13:49 | 7.5 | 7.5 |
| 10 Dec 2024, 11:07 | 7.83 | 7.83 |
| 26 Nov 2024, 12:35 | 7.63 | 7.63 |
| 23 Sep 2024, 16:22 | 7.84 | 7.84 |
| 22 Aug 2024, 11:59 | 7.84 | 7.84 |
| 30 Jul 2024, 09:35 | 8.08 | 8.08 |
| 23 Jul 2024, 13:37 | 7.68 | 7.68 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 18 May 2026, 4 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 13:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 May 2026, 14:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Apr 2026, 10:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Apr 2026, 12:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Mar 2026, 10:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Mar 2026, 13:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Feb 2026, 10:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Feb 2026, 11:59 | 0.18 | 0.18 mg/l |
| 9 Feb 2026, 14:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Jan 2026, 11:13 | 0.077 | 0.077 mg/l |
| 15 Dec 2025, 11:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2025, 13:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Nov 2025, 15:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Nov 2025, 13:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Oct 2025, 13:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Sep 2025, 12:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Aug 2025, 12:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Jul 2025, 12:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Jun 2025, 11:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 May 2025, 11:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Apr 2025, 10:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Mar 2025, 12:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Feb 2025, 12:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jan 2025, 13:49 | 0.11 | 0.11 mg/l |
| 10 Dec 2024, 11:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Nov 2024, 12:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Sep 2024, 16:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Aug 2024, 11:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Jul 2024, 09:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jul 2024, 13:37 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
2.6 mg/l
Sampled 18 May 2026, 4 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 13:36 | 2.6 | 2.6 mg/l |
| 7 May 2026, 14:26 | 2.99 | 2.99 mg/l |
| 20 Apr 2026, 10:34 | 2.6 | 2.6 mg/l |
| 8 Apr 2026, 12:24 | 2.7 | 2.7 mg/l |
| 24 Mar 2026, 10:41 | 2.5 | 2.5 mg/l |
| 5 Mar 2026, 13:13 | 2.3 | 2.3 mg/l |
| 25 Feb 2026, 10:12 | 2.5 | 2.5 mg/l |
| 19 Feb 2026, 11:59 | 1.6 | 1.6 mg/l |
| 9 Feb 2026, 14:35 | 1.7 | 1.7 mg/l |
| 21 Jan 2026, 11:13 | 1.2 | 1.2 mg/l |
| 15 Dec 2025, 11:55 | 2.7 | 2.7 mg/l |
| 3 Dec 2025, 13:12 | 2.7 | 2.7 mg/l |
| 21 Nov 2025, 15:58 | 2.69 | 2.69 mg/l |
| 14 Nov 2025, 13:23 | 2.79 | 2.79 mg/l |
| 10 Oct 2025, 13:25 | 2.5 | 2.5 mg/l |
| 9 Sep 2025, 12:38 | 2.3 | 2.3 mg/l |
| 22 Aug 2025, 12:55 | 3 | 3 mg/l |
| 1 Jul 2025, 12:35 | 3.39 | 3.39 mg/l |
| 6 Jun 2025, 11:35 | 2.9 | 2.9 mg/l |
| 13 May 2025, 11:06 | 2.89 | 2.89 mg/l |
| 24 Apr 2025, 10:44 | 2.2 | 2.2 mg/l |
| 7 Mar 2025, 12:18 | 2.8 | 2.8 mg/l |
| 11 Feb 2025, 12:37 | 2.7 | 2.7 mg/l |
| 23 Jan 2025, 13:49 | 1.2 | 1.2 mg/l |
| 10 Dec 2024, 11:07 | 2.6 | 2.6 mg/l |
| 26 Nov 2024, 12:35 | 2.4 | 2.4 mg/l |
| 23 Sep 2024, 16:22 | 2.5 | 2.5 mg/l |
| 22 Aug 2024, 11:59 | 3.59 | 3.59 mg/l |
| 30 Jul 2024, 09:35 | 3.6 | 3.6 mg/l |
| 23 Jul 2024, 13:37 | 3 | 3 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.053 mg/l
Sampled 18 May 2026, 4 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 13:36 | 0.053 | 0.053 mg/l |
| 7 May 2026, 14:26 | 0.028 | 0.028 mg/l |
| 20 Apr 2026, 10:34 | 0.023 | 0.023 mg/l |
| 8 Apr 2026, 12:24 | 0.035 | 0.035 mg/l |
| 24 Mar 2026, 10:41 | 0.024 | 0.024 mg/l |
| 5 Mar 2026, 13:13 | 0.035 | 0.035 mg/l |
| 25 Feb 2026, 10:12 | 0.037 | 0.037 mg/l |
| 19 Feb 2026, 11:59 | 0.065 | 0.065 mg/l |
| 9 Feb 2026, 14:35 | 0.053 | 0.053 mg/l |
| 21 Jan 2026, 11:13 | 0.095 | 0.095 mg/l |
| 15 Dec 2025, 11:55 | 0.036 | 0.036 mg/l |
| 3 Dec 2025, 13:12 | 0.041 | 0.041 mg/l |
| 21 Nov 2025, 15:58 | 0.029 | 0.029 mg/l |
| 14 Nov 2025, 13:23 | 0.055 | 0.055 mg/l |
| 10 Oct 2025, 13:25 | 0.04 | 0.04 mg/l |
| 9 Sep 2025, 12:38 | 0.043 | 0.043 mg/l |
| 22 Aug 2025, 12:55 | 0.053 | 0.053 mg/l |
| 1 Jul 2025, 12:35 | 0.055 | 0.055 mg/l |
| 6 Jun 2025, 11:35 | 0.038 | 0.038 mg/l |
| 13 May 2025, 11:06 | 0.023 | 0.023 mg/l |
| 24 Apr 2025, 10:44 | 0.039 | 0.039 mg/l |
| 7 Mar 2025, 12:18 | 0.024 | 0.024 mg/l |
| 11 Feb 2025, 12:37 | 0.026 | 0.026 mg/l |
| 23 Jan 2025, 13:49 | 0.073 | 0.073 mg/l |
| 10 Dec 2024, 11:07 | 0.023 | 0.023 mg/l |
| 26 Nov 2024, 12:35 | 0.036 | 0.036 mg/l |
| 23 Sep 2024, 16:22 | 0.038 | 0.038 mg/l |
| 22 Aug 2024, 11:59 | 0.042 | 0.042 mg/l |
| 30 Jul 2024, 09:35 | 0.041 | 0.041 mg/l |
| 23 Jul 2024, 13:37 | 0.041 | 0.041 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
238 µS/cm
Sampled 18 May 2026, 4 months ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 13:36 | 238 | 238 µS/cm |
| 7 May 2026, 14:26 | 239 | 239 µS/cm |
| 20 Apr 2026, 10:34 | 205 | 205 µS/cm |
| 8 Apr 2026, 12:24 | 227 | 227 µS/cm |
| 24 Mar 2026, 10:41 | 217 | 217 µS/cm |
| 5 Mar 2026, 13:13 | 203 | 203 µS/cm |
| 25 Feb 2026, 10:12 | 210 | 210 µS/cm |
| 9 Feb 2026, 14:35 | 174 | 174 µS/cm |
| 21 Jan 2026, 11:13 | 134 | 134 µS/cm |
| 15 Dec 2025, 11:55 | 218 | 218 µS/cm |
| 3 Dec 2025, 13:12 | 215 | 215 µS/cm |
| 21 Nov 2025, 15:58 | 238 | 238 µS/cm |
| 14 Nov 2025, 13:23 | 233 | 233 µS/cm |
| 10 Oct 2025, 13:25 | 263 | 263 µS/cm |
| 9 Sep 2025, 12:38 | 267 | 267 µS/cm |
| 22 Aug 2025, 12:55 | 257 | 257 µS/cm |
| 1 Jul 2025, 12:35 | 257 | 257 µS/cm |
| 6 Jun 2025, 11:35 | 242 | 242 µS/cm |
| 13 May 2025, 11:06 | 242 | 242 µS/cm |
| 24 Apr 2025, 10:44 | 225 | 225 µS/cm |
| 7 Mar 2025, 12:18 | 223 | 223 µS/cm |
| 11 Feb 2025, 12:37 | 219 | 219 µS/cm |
| 23 Jan 2025, 13:49 | 123 | 123 µS/cm |
| 10 Dec 2024, 11:07 | 219 | 219 µS/cm |
| 26 Nov 2024, 12:35 | 216 | 216 µS/cm |
| 23 Sep 2024, 16:22 | 246 | 246 µS/cm |
| 22 Aug 2024, 11:59 | 257 | 257 µS/cm |
| 30 Jul 2024, 09:35 | 266 | 266 µS/cm |
| 23 Jul 2024, 13:37 | 241 | 241 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 | 29 | Jul 2024 – May 2026 | 98% 18 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 29 | Jul 2024 – May 2026 | 10.8 mg/l 18 May 2026 |
| Temperature of Water 0076 | River water | 29 | Jul 2024 – May 2026 | 10.8 °C 18 May 2026 |
| pH 0061 | River water | 29 | Jul 2024 – May 2026 | 8.1 18 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 30 | Jul 2024 – May 2026 | below 0.03 mg/l 18 May 2026 |
| Nitrate as N 0117 | River water | 30 | Jul 2024 – May 2026 | 2.6 mg/l 18 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 30 | Jul 2024 – May 2026 | 0.053 mg/l 18 May 2026 |
| Conductivity at 25 C 0077 | River water | 29 | Jul 2024 – May 2026 | 238 µS/cm 18 May 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 29 | Jul 2024 – May 2026 | 61 mg/l 18 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 29 | Jul 2024 – May 2026 | below 0.00058 mg/l 18 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 27 | Jul 2024 – May 2026 | 1.4 mg/l 18 May 2026 |
| Nitrite as N 0118 | River water | 30 | Jul 2024 – May 2026 | below 0.004 mg/l 18 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 30 | Jul 2024 – May 2026 | 2.6 mg/l 18 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.