Avon Water Efford Mill
EA name: AVON WTR EFFORD MILL (also listed as “AVON WATER AT EFFORD MILL”)
Environment Agency sampling point SO-G0004218 · 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
- 14 Sep 2026, 15:0417 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 27 since 16 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 430684, 94062As published, to the nearest 1 m. Open in a map
- River, by its own name
- Avon Water
- River, by the map
- Avon WaterPlaced on the river its name gives, 4 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Why it was sampled
- Monitoring (national agency policy) (21 samples)
Environmental monitoring statutory (EU directives) (6 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
89.8%
Sampled 14 Sep 2026, 17 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 15:04 | 89.8 | 89.8% |
| 3 Aug 2026, 10:46 | 88.6 | 88.6% |
| 1 Jul 2026, 12:21 | 93.4 | 93.4% |
| 4 Jun 2026, 12:45 | 92.7 | 92.7% |
| 5 May 2026, 10:34 | 92.6 | 92.6% |
| 14 Apr 2026, 10:18 | 95.8 | 95.8% |
| 6 Mar 2026, 09:04 | 95 | 95% |
| 18 Feb 2026, 14:52 | 97.9 | 97.9% |
| 22 Jan 2026, 09:38 | 92.7 | 92.7% |
| 6 Mar 2025, 13:55 | 98.1 | 98.1% |
| 6 Feb 2025, 11:32 | 96.2 | 96.2% |
| 15 Jan 2025, 10:38 | 95.6 | 95.6% |
| 6 Dec 2024, 08:51 | 92.6 | 92.6% |
| 20 Nov 2024, 10:50 | 93.2 | 93.2% |
| 29 Oct 2024, 10:27 | 91.6 | 91.6% |
| 26 Sep 2024, 10:04 | 93.7 | 93.7% |
| 21 Aug 2024, 09:38 | 89 | 89% |
| 23 Jul 2024, 14:08 | 93.1 | 93.1% |
| 25 Jun 2024, 08:54 | 88.4 | 88.4% |
| 17 May 2024, 11:08 | 93.3 | 93.3% |
| 26 Apr 2024, 16:28 | 99 | 99% |
| 18 Mar 2024, 09:53 | 94.6 | 94.6% |
| 19 Feb 2024, 12:51 | 95.1 | 95.1% |
| 15 Jan 2024, 12:16 | 93.9 | 93.9% |
| 14 Dec 2023, 09:14 | 95.5 | 95.5% |
| 20 Nov 2023, 11:56 | 91.9 | 91.9% |
| 16 Oct 2023, 13:47 | 90.9 | 90.9% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.53 mg/l
Sampled 14 Sep 2026, 17 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 15:04 | 8.53 | 8.53 mg/l |
| 3 Aug 2026, 10:46 | 8.47 | 8.47 mg/l |
| 1 Jul 2026, 12:21 | 8.86 | 8.86 mg/l |
| 4 Jun 2026, 12:45 | 9.28 | 9.28 mg/l |
| 5 May 2026, 10:34 | 9.56 | 9.56 mg/l |
| 14 Apr 2026, 10:18 | 10.9 | 10.9 mg/l |
| 6 Mar 2026, 09:04 | 11 | 11 mg/l |
| 18 Feb 2026, 14:52 | 12 | 12 mg/l |
| 22 Jan 2026, 09:38 | 10.9 | 10.9 mg/l |
| 6 Mar 2025, 13:55 | 11.6 | 11.6 mg/l |
| 6 Feb 2025, 11:32 | 12.1 | 12.1 mg/l |
| 15 Jan 2025, 10:38 | 11.7 | 11.7 mg/l |
| 6 Dec 2024, 08:51 | 10.7 | 10.7 mg/l |
| 20 Nov 2024, 10:50 | 11.4 | 11.4 mg/l |
| 29 Oct 2024, 10:27 | 9.67 | 9.67 mg/l |
| 26 Sep 2024, 10:04 | 9.59 | 9.59 mg/l |
| 21 Aug 2024, 09:38 | 8.93 | 8.93 mg/l |
| 23 Jul 2024, 14:08 | 8.83 | 8.83 mg/l |
| 25 Jun 2024, 08:54 | 8.72 | 8.72 mg/l |
| 17 May 2024, 11:08 | 9.66 | 9.66 mg/l |
| 26 Apr 2024, 16:28 | 11 | 11 mg/l |
| 18 Mar 2024, 09:53 | 10.5 | 10.5 mg/l |
| 19 Feb 2024, 12:51 | 10.6 | 10.6 mg/l |
| 15 Jan 2024, 12:16 | 12 | 12 mg/l |
| 14 Dec 2023, 09:14 | 11.7 | 11.7 mg/l |
| 20 Nov 2023, 11:56 | 10.2 | 10.2 mg/l |
| 16 Oct 2023, 13:47 | 10.3 | 10.3 mg/l |
Water temperature
code 0076 · °C
17.7 °C
Sampled 14 Sep 2026, 17 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 15:04 | 17.7 | 17.7 °C |
| 3 Aug 2026, 10:46 | 17.4 | 17.4 °C |
| 1 Jul 2026, 12:21 | 17.8 | 17.8 °C |
| 4 Jun 2026, 12:45 | 15.2 | 15.2 °C |
| 5 May 2026, 10:34 | 13.8 | 13.8 °C |
| 14 Apr 2026, 10:18 | 9.7 | 9.7 °C |
| 6 Mar 2026, 09:04 | 8.7 | 8.7 °C |
| 18 Feb 2026, 14:52 | 6.4 | 6.4 °C |
| 22 Jan 2026, 09:38 | 8.2 | 8.2 °C |
| 6 Mar 2025, 13:55 | 8 | 8 °C |
| 6 Feb 2025, 11:32 | 5.6 | 5.6 °C |
| 15 Jan 2025, 10:38 | 6.5 | 6.5 °C |
| 6 Dec 2024, 08:51 | 8.8 | 8.8 °C |
| 20 Nov 2024, 10:50 | 6.7 | 6.7 °C |
| 29 Oct 2024, 10:27 | 12.8 | 12.8 °C |
| 26 Sep 2024, 10:04 | 14.2 | 14.2 °C |
| 21 Aug 2024, 09:38 | 15.1 | 15.1 °C |
| 23 Jul 2024, 14:08 | 17.8 | 17.8 °C |
| 25 Jun 2024, 08:54 | 15.9 | 15.9 °C |
| 17 May 2024, 11:08 | 13.7 | 13.7 °C |
| 26 Apr 2024, 16:28 | 10.5 | 10.5 °C |
| 18 Mar 2024, 09:53 | 10.6 | 10.6 °C |
| 19 Feb 2024, 12:51 | 10.3 | 10.3 °C |
| 15 Jan 2024, 12:16 | 4.8 | 4.8 °C |
| 14 Dec 2023, 09:14 | 6.7 | 6.7 °C |
| 20 Nov 2023, 11:56 | 10.8 | 10.8 °C |
| 16 Oct 2023, 13:47 | 9.9 | 9.9 °C |
pH
code 0061
7.45
Sampled 14 Sep 2026, 17 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 15:04 | 7.45 | 7.45 |
| 3 Aug 2026, 10:46 | 7.55 | 7.55 |
| 1 Jul 2026, 12:21 | 7.52 | 7.52 |
| 4 Jun 2026, 12:45 | 7.36 | 7.36 |
| 5 May 2026, 10:34 | 7.55 | 7.55 |
| 14 Apr 2026, 10:18 | 7.61 | 7.61 |
| 6 Mar 2026, 09:04 | 7.41 | 7.41 |
| 18 Feb 2026, 14:52 | 7.44 | 7.44 |
| 22 Jan 2026, 09:38 | 7.1 | 7.1 |
| 6 Mar 2025, 13:55 | 7.51 | 7.51 |
| 6 Feb 2025, 11:32 | 8 | 8 |
| 15 Jan 2025, 10:38 | 7.78 | 7.78 |
| 6 Dec 2024, 08:51 | 7.2 | 7.2 |
| 20 Nov 2024, 10:50 | 7.52 | 7.52 |
| 29 Oct 2024, 10:27 | 7.35 | 7.35 |
| 26 Sep 2024, 10:04 | 7.19 | 7.19 |
| 21 Aug 2024, 09:38 | 7.45 | 7.45 |
| 23 Jul 2024, 14:08 | 7.96 | 7.96 |
| 25 Jun 2024, 08:54 | 7.4 | 7.4 |
| 17 May 2024, 11:08 | 7.48 | 7.48 |
| 26 Apr 2024, 16:28 | 7.83 | 7.83 |
| 18 Mar 2024, 09:53 | 7.35 | 7.35 |
| 19 Feb 2024, 12:51 | 7.24 | 7.24 |
| 15 Jan 2024, 12:16 | 7.27 | 7.27 |
| 14 Dec 2023, 09:14 | 7.51 | 7.51 |
| 20 Nov 2023, 11:56 | 7.3 | 7.3 |
| 16 Oct 2023, 13:47 | 7.46 | 7.46 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 14 Sep 2026, 17 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 15:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Aug 2026, 10:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Jul 2026, 12:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jun 2026, 12:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 May 2026, 10:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Apr 2026, 10:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Mar 2026, 09:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Feb 2026, 14:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jan 2026, 09:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Mar 2025, 13:55 | 0.037 | 0.037 mg/l |
| 6 Feb 2025, 11:32 | 0.045 | 0.045 mg/l |
| 15 Jan 2025, 10:38 | 0.032 | 0.032 mg/l |
| 20 Nov 2024, 10:50 | 0.036 | 0.036 mg/l |
| 29 Oct 2024, 10:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Sep 2024, 10:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Aug 2024, 09:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jul 2024, 14:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Jun 2024, 08:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 May 2024, 11:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Apr 2024, 16:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Mar 2024, 09:53 | 0.036 | 0.036 mg/l |
| 19 Feb 2024, 12:51 | 0.071 | 0.071 mg/l |
| 15 Jan 2024, 12:16 | 0.079 | 0.079 mg/l |
| 14 Dec 2023, 09:14 | 0.042 | 0.042 mg/l |
| 20 Nov 2023, 11:56 | 0.042 | 0.042 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.9 mg/l
Sampled 14 Sep 2026, 17 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 15:04 | 1.9 | 1.9 mg/l |
| 3 Aug 2026, 10:46 | 1.4 | 1.4 mg/l |
| 1 Jul 2026, 12:21 | 2.1 | 2.1 mg/l |
| 4 Jun 2026, 12:45 | 1.2 | 1.2 mg/l |
| 5 May 2026, 10:34 | 1.59 | 1.59 mg/l |
| 14 Apr 2026, 10:18 | 1.4 | 1.4 mg/l |
| 6 Mar 2026, 09:04 | 0.986 | 0.986 mg/l |
| 18 Feb 2026, 14:52 | 0.776 | 0.776 mg/l |
| 22 Jan 2026, 09:38 | 0.646 | 0.646 mg/l |
| 6 Mar 2025, 13:55 | 1.19 | 1.19 mg/l |
| 6 Feb 2025, 11:32 | 1.19 | 1.19 mg/l |
| 15 Jan 2025, 10:38 | 1.29 | 1.29 mg/l |
| 20 Nov 2024, 10:50 | 0.664 | 0.664 mg/l |
| 29 Oct 2024, 10:27 | 0.995 | 0.995 mg/l |
| 26 Sep 2024, 10:04 | 0.536 | 0.536 mg/l |
| 21 Aug 2024, 09:38 | 1.8 | 1.8 mg/l |
| 23 Jul 2024, 14:08 | 1.9 | 1.9 mg/l |
| 25 Jun 2024, 08:54 | 1.99 | 1.99 mg/l |
| 17 May 2024, 11:08 | 1.08 | 1.08 mg/l |
| 26 Apr 2024, 16:28 | 1.09 | 1.09 mg/l |
| 18 Mar 2024, 09:53 | 0.524 | 0.524 mg/l |
| 19 Feb 2024, 12:51 | 0.702 | 0.702 mg/l |
| 15 Jan 2024, 12:16 | 1.19 | 1.19 mg/l |
| 14 Dec 2023, 09:14 | 0.675 | 0.675 mg/l |
| 20 Nov 2023, 11:56 | 0.665 | 0.665 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.037 mg/l
Sampled 14 Sep 2026, 17 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 15:04 | 0.037 | 0.037 mg/l |
| 3 Aug 2026, 10:46 | 0.05 | 0.05 mg/l |
| 1 Jul 2026, 12:21 | 0.067 | 0.067 mg/l |
| 4 Jun 2026, 12:45 | 0.061 | 0.061 mg/l |
| 5 May 2026, 10:34 | 0.038 | 0.038 mg/l |
| 14 Apr 2026, 10:18 | 0.033 | 0.033 mg/l |
| 6 Mar 2026, 09:04 | 0.047 | 0.047 mg/l |
| 18 Feb 2026, 14:52 | 0.069 | 0.069 mg/l |
| 22 Jan 2026, 09:38 | 0.045 | 0.045 mg/l |
| 6 Mar 2025, 13:55 | 0.034 | 0.034 mg/l |
| 6 Feb 2025, 11:32 | 0.062 | 0.062 mg/l |
| 15 Jan 2025, 10:38 | 0.048 | 0.048 mg/l |
| 20 Nov 2024, 10:50 | 0.072 | 0.072 mg/l |
| 29 Oct 2024, 10:27 | 0.11 | 0.11 mg/l |
| 26 Sep 2024, 10:04 | 0.067 | 0.067 mg/l |
| 21 Aug 2024, 09:38 | 0.22 | 0.22 mg/l |
| 23 Jul 2024, 14:08 | 0.19 | 0.19 mg/l |
| 25 Jun 2024, 08:54 | 0.2 | 0.2 mg/l |
| 17 May 2024, 11:08 | 0.11 | 0.11 mg/l |
| 26 Apr 2024, 16:28 | 0.085 | 0.085 mg/l |
| 18 Mar 2024, 09:53 | 0.068 | 0.068 mg/l |
| 19 Feb 2024, 12:51 | 0.1 | 0.1 mg/l |
| 15 Jan 2024, 12:16 | 0.08 | 0.08 mg/l |
| 14 Dec 2023, 09:14 | 0.094 | 0.094 mg/l |
| 20 Nov 2023, 11:56 | 0.11 | 0.11 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
281 µS/cm
Sampled 14 Sep 2026, 17 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 15:04 | 281 | 281 µS/cm |
| 3 Aug 2026, 10:46 | 258 | 258 µS/cm |
| 1 Jul 2026, 12:21 | 282 | 282 µS/cm |
| 4 Jun 2026, 12:45 | 235 | 235 µS/cm |
| 5 May 2026, 10:34 | 256 | 256 µS/cm |
| 14 Apr 2026, 10:18 | 255 | 255 µS/cm |
| 6 Mar 2026, 09:04 | 238 | 238 µS/cm |
| 18 Feb 2026, 14:52 | 214 | 214 µS/cm |
| 22 Jan 2026, 09:38 | 171 | 171 µS/cm |
| 6 Mar 2025, 13:55 | 252 | 252 µS/cm |
| 6 Feb 2025, 11:32 | 315 | 315 µS/cm |
| 15 Jan 2025, 10:38 | 262 | 262 µS/cm |
| 6 Dec 2024, 08:51 | 190 | 190 µS/cm |
| 20 Nov 2024, 10:50 | 216 | 216 µS/cm |
| 29 Oct 2024, 10:27 | 248 | 248 µS/cm |
| 26 Sep 2024, 10:04 | 197 | 197 µS/cm |
| 21 Aug 2024, 09:38 | 240 | 240 µS/cm |
| 23 Jul 2024, 14:08 | 251 | 251 µS/cm |
| 25 Jun 2024, 08:54 | 246 | 246 µS/cm |
| 17 May 2024, 11:08 | 235 | 235 µS/cm |
| 26 Apr 2024, 16:28 | 227 | 227 µS/cm |
| 18 Mar 2024, 09:53 | 193 | 193 µS/cm |
| 19 Feb 2024, 12:51 | 193 | 193 µS/cm |
| 15 Jan 2024, 12:16 | 255 | 255 µS/cm |
| 14 Dec 2023, 09:14 | 213 | 213 µS/cm |
| 20 Nov 2023, 11:56 | 228 | 228 µS/cm |
| 16 Oct 2023, 13:47 | 247 | 247 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 | 27 | Oct 2023 – Sep 2026 | 89.8% 14 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 27 | Oct 2023 – Sep 2026 | 8.53 mg/l 14 Sep 2026 |
| Temperature of Water 0076 | River water | 27 | Oct 2023 – Sep 2026 | 17.7 °C 14 Sep 2026 |
| pH 0061 | River water | 27 | Oct 2023 – Sep 2026 | 7.45 14 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 25 | Nov 2023 – Sep 2026 | below 0.03 mg/l 14 Sep 2026 |
| Nitrate as N 0117 | River water | 25 | Nov 2023 – Sep 2026 | 1.9 mg/l 14 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 25 | Nov 2023 – Sep 2026 | 0.037 mg/l 14 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 27 | Oct 2023 – Sep 2026 | 281 µS/cm 14 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 25 | Nov 2023 – Sep 2026 | 39 mg/l 14 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 25 | Nov 2023 – Sep 2026 | below 0.00028 mg/l 14 Sep 2026 |
| BOD : 5 Day ATU 0085 | River water | 18 | Feb 2024 – May 2026 | 1.1 mg/l 5 May 2026 |
| Nitrite as N 0118 | River water | 25 | Nov 2023 – Sep 2026 | below 0.004 mg/l 14 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 25 | Nov 2023 – Sep 2026 | 1.9 mg/l 14 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.