Rettendon Brook W Arm B1012 Road Bridge
EA name: RETTENDON BK.W ARM B1012 RD.BR.
Environment Agency sampling point AN-CE1540 · 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
- 6 May 2026, 10:195 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 17 Jun 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 579345, 197527As published, to the nearest 1 m. Open in a map
- River, by its own name
- Rettendon Brook
- River, by the map
- Rettendon BrookPlaced on the river its name gives, 2 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) (24 samples)
1 visit found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
76.9%
Sampled 6 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 May 2026, 10:19 | 76.9 | 76.9% |
| 14 Apr 2026, 10:59 | 86.5 | 86.5% |
| 2 Mar 2026, 13:18 | 95.3 | 95.3% |
| 6 Feb 2026, 12:58 | 88.2 | 88.2% |
| 1 Dec 2025, 11:24 | 73.2 | 73.2% |
| 13 Nov 2025, 11:20 | 46.5 | 46.5% |
| 7 Oct 2025, 13:55 | 87.9 | 87.9% |
| 1 Sep 2025, 13:24 | 47.2 | 47.2% |
| 1 Aug 2025, 08:53 | 48.8 | 48.8% |
| 7 Jul 2025, 14:31 | 47.2 | 47.2% |
| 3 Jun 2025, 09:54 | 14.2 | 14.2% |
| 12 May 2025, 11:29 | 77.8 | 77.8% |
| 8 Apr 2025, 11:30 | 102.6 | 102.6% |
| 20 Mar 2025, 11:11 | 115.8 | 115.8% |
| 12 Feb 2025, 11:32 | 97.9 | 97.9% |
| 28 Jan 2025, 10:03 | 94.6 | 94.6% |
| 11 Dec 2024, 12:57 | 88.1 | 88.1% |
| 20 Nov 2024, 10:44 | 85.2 | 85.2% |
| 18 Oct 2024, 09:07 | 86.6 | 86.6% |
| 26 Sep 2024, 08:57 | 80.6 | 80.6% |
| 29 Aug 2024, 14:57 | 48.2 | 48.2% |
| 30 Jul 2024, 11:13 | 42.3 | 42.3% |
| 17 Jun 2024, 11:40 | 68.8 | 68.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.48 mg/l
Sampled 6 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 May 2026, 10:19 | 8.48 | 8.48 mg/l |
| 14 Apr 2026, 10:59 | 10.3 | 10.3 mg/l |
| 2 Mar 2026, 13:18 | 10.7 | 10.7 mg/l |
| 6 Feb 2026, 12:58 | 10.5 | 10.5 mg/l |
| 1 Dec 2025, 11:24 | 8.61 | 8.61 mg/l |
| 13 Nov 2025, 11:20 | 4.93 | 4.93 mg/l |
| 7 Oct 2025, 13:55 | 9.06 | 9.06 mg/l |
| 1 Sep 2025, 13:24 | 4.56 | 4.56 mg/l |
| 1 Aug 2025, 08:53 | 4.87 | 4.87 mg/l |
| 7 Jul 2025, 14:31 | 4.6 | 4.6 mg/l |
| 3 Jun 2025, 09:54 | 1.47 | 1.47 mg/l |
| 12 May 2025, 11:29 | 7.82 | 7.82 mg/l |
| 8 Apr 2025, 11:30 | 12.1 | 12.1 mg/l |
| 20 Mar 2025, 11:11 | 13.2 | 13.2 mg/l |
| 12 Feb 2025, 11:32 | 12.3 | 12.3 mg/l |
| 28 Jan 2025, 10:03 | 11.5 | 11.5 mg/l |
| 11 Dec 2024, 12:57 | 10.7 | 10.7 mg/l |
| 20 Nov 2024, 10:44 | 10.8 | 10.8 mg/l |
| 18 Oct 2024, 09:07 | 9.53 | 9.53 mg/l |
| 26 Sep 2024, 08:57 | 8.25 | 8.25 mg/l |
| 29 Aug 2024, 14:57 | 4.57 | 4.57 mg/l |
| 30 Jul 2024, 11:13 | 3.94 | 3.94 mg/l |
| 17 Jun 2024, 11:40 | 7 | 7 mg/l |
Water temperature
code 0076 · °C
10.9 °C
Sampled 6 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 May 2026, 10:19 | 10.9 | 10.9 °C |
| 14 Apr 2026, 10:59 | 7.8 | 7.8 °C |
| 2 Mar 2026, 13:18 | 10 | 10 °C |
| 6 Feb 2026, 12:58 | 7.9 | 7.9 °C |
| 1 Dec 2025, 11:24 | 8.2 | 8.2 °C |
| 13 Nov 2025, 11:20 | 12.6 | 12.6 °C |
| 7 Oct 2025, 13:55 | 13.9 | 13.9 °C |
| 1 Sep 2025, 13:24 | 16.9 | 16.9 °C |
| 1 Aug 2025, 08:53 | 15.4 | 15.4 °C |
| 7 Jul 2025, 14:31 | 16.5 | 16.5 °C |
| 3 Jun 2025, 09:54 | 13.6 | 13.6 °C |
| 12 May 2025, 11:29 | 15 | 15 °C |
| 8 Apr 2025, 11:30 | 8 | 8 °C |
| 20 Mar 2025, 11:11 | 9.4 | 9.4 °C |
| 12 Feb 2025, 11:32 | 5.6 | 5.6 °C |
| 28 Jan 2025, 10:03 | 7 | 7 °C |
| 11 Dec 2024, 12:57 | 7 | 7 °C |
| 20 Nov 2024, 10:44 | 5.2 | 5.2 °C |
| 18 Oct 2024, 09:07 | 11 | 11 °C |
| 26 Sep 2024, 08:57 | 14.2 | 14.2 °C |
| 29 Aug 2024, 14:57 | 17.8 | 17.8 °C |
| 30 Jul 2024, 11:13 | 18.7 | 18.7 °C |
| 17 Jun 2024, 11:40 | 14.5 | 14.5 °C |
pH
code 0061
8.03
Sampled 6 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 May 2026, 10:19 | 8.03 | 8.03 |
| 14 Apr 2026, 10:59 | 8.18 | 8.18 |
| 2 Mar 2026, 13:18 | 8.06 | 8.06 |
| 6 Feb 2026, 12:58 | 8.01 | 8.01 |
| 1 Dec 2025, 11:24 | 7.73 | 7.73 |
| 13 Nov 2025, 11:20 | 7.62 | 7.62 |
| 7 Oct 2025, 13:55 | 7.8 | 7.8 |
| 1 Sep 2025, 13:24 | 7.6 | 7.6 |
| 1 Aug 2025, 08:53 | 7.96 | 7.96 |
| 7 Jul 2025, 14:31 | 7.67 | 7.67 |
| 3 Jun 2025, 09:54 | 7.7 | 7.7 |
| 12 May 2025, 11:29 | 8.25 | 8.25 |
| 8 Apr 2025, 11:30 | 8.51 | 8.51 |
| 20 Mar 2025, 11:11 | 8.33 | 8.33 |
| 12 Feb 2025, 11:32 | 8.08 | 8.08 |
| 28 Jan 2025, 10:03 | 8.03 | 8.03 |
| 11 Dec 2024, 12:57 | 8.03 | 8.03 |
| 20 Nov 2024, 10:44 | 7.9 | 7.9 |
| 18 Oct 2024, 09:07 | 7.88 | 7.88 |
| 26 Sep 2024, 08:57 | 7.83 | 7.83 |
| 29 Aug 2024, 14:57 | 7.62 | 7.62 |
| 30 Jul 2024, 11:13 | 7.31 | 7.31 |
| 17 Jun 2024, 11:40 | 8.17 | 8.17 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.17 mg/l
Sampled 6 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 May 2026, 10:19 | 0.17 | 0.17 mg/l |
| 14 Apr 2026, 10:59 | 0.072 | 0.072 mg/l |
| 2 Mar 2026, 13:18 | 0.069 | 0.069 mg/l |
| 6 Feb 2026, 12:58 | 0.12 | 0.12 mg/l |
| 1 Dec 2025, 11:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Nov 2025, 11:20 | 0.2 | 0.2 mg/l |
| 7 Oct 2025, 13:55 | 0.14 | 0.14 mg/l |
| 1 Sep 2025, 13:24 | 0.64 | 0.64 mg/l |
| 1 Aug 2025, 08:53 | 0.13 | 0.13 mg/l |
| 7 Jul 2025, 14:31 | 2.1 | 2.1 mg/l |
| 3 Jun 2025, 09:54 | 0.8 | 0.8 mg/l |
| 12 May 2025, 11:29 | 0.082 | 0.082 mg/l |
| 8 Apr 2025, 11:30 | 0.038 | 0.038 mg/l |
| 20 Mar 2025, 11:11 | 0.068 | 0.068 mg/l |
| 12 Feb 2025, 11:32 | 0.26 | 0.26 mg/l |
| 28 Jan 2025, 10:03 | 0.1 | 0.1 mg/l |
| 11 Dec 2024, 12:57 | 0.31 | 0.31 mg/l |
| 20 Nov 2024, 10:44 | 0.66 | 0.66 mg/l |
| 18 Oct 2024, 09:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Sep 2024, 08:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 Aug 2024, 14:57 | 0.16 | 0.16 mg/l |
| 30 Jul 2024, 11:13 | 0.39 | 0.39 mg/l |
| 17 Jun 2024, 11:40 | 0.17 | 0.17 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.866 mg/l
Sampled 6 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 May 2026, 10:19 | 0.866 | 0.866 mg/l |
| 14 Apr 2026, 10:59 | 2.19 | 2.19 mg/l |
| 2 Mar 2026, 13:18 | 5.87 | 5.87 mg/l |
| 6 Feb 2026, 12:58 | 6.88 | 6.88 mg/l |
| 1 Dec 2025, 11:24 | 0.94 | 0.94 mg/l |
| 13 Nov 2025, 11:20 | 0.83 | 0.83 mg/l |
| 7 Oct 2025, 13:55 | 2.63 | 2.63 mg/l |
| 1 Sep 2025, 13:24 | 0.218 | 0.218 mg/l |
| 1 Aug 2025, 08:53 | 0.364 | 0.364 mg/l |
| 7 Jul 2025, 14:31 | 0.223 | 0.223 mg/l |
| 3 Jun 2025, 09:54 | <0.196 | below 0.196 mg/l (not detected above this) |
| 12 May 2025, 11:29 | 0.387 | 0.387 mg/l |
| 8 Apr 2025, 11:30 | 2.19 | 2.19 mg/l |
| 20 Mar 2025, 11:11 | 5.67 | 5.67 mg/l |
| 12 Feb 2025, 11:32 | 14.9 | 14.9 mg/l |
| 28 Jan 2025, 10:03 | 13.9 | 13.9 mg/l |
| 11 Dec 2024, 12:57 | 7.15 | 7.15 mg/l |
| 20 Nov 2024, 10:44 | 9.87 | 9.87 mg/l |
| 18 Oct 2024, 09:07 | 19.9 | 19.9 mg/l |
| 26 Sep 2024, 08:57 | 0.768 | 0.768 mg/l |
| 29 Aug 2024, 14:57 | 0.227 | 0.227 mg/l |
| 30 Jul 2024, 11:13 | 1.49 | 1.49 mg/l |
| 17 Jun 2024, 11:40 | 0.723 | 0.723 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.29 mg/l
Sampled 6 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 May 2026, 10:19 | 0.29 | 0.29 mg/l |
| 14 Apr 2026, 10:59 | 0.13 | 0.13 mg/l |
| 2 Mar 2026, 13:18 | 0.2 | 0.2 mg/l |
| 6 Feb 2026, 12:58 | 0.21 | 0.21 mg/l |
| 1 Dec 2025, 11:24 | 0.26 | 0.26 mg/l |
| 13 Nov 2025, 11:20 | 0.42 | 0.42 mg/l |
| 7 Oct 2025, 13:55 | 1.6 | 1.6 mg/l |
| 1 Sep 2025, 13:24 | 2.7 | 2.7 mg/l |
| 1 Aug 2025, 08:53 | 0.94 | 0.94 mg/l |
| 7 Jul 2025, 14:31 | 3.3 | 3.3 mg/l |
| 3 Jun 2025, 09:54 | 2.5 | 2.5 mg/l |
| 12 May 2025, 11:29 | 0.61 | 0.61 mg/l |
| 8 Apr 2025, 11:30 | 0.19 | 0.19 mg/l |
| 20 Mar 2025, 11:11 | 0.18 | 0.18 mg/l |
| 12 Feb 2025, 11:32 | 0.16 | 0.16 mg/l |
| 28 Jan 2025, 10:03 | 0.15 | 0.15 mg/l |
| 11 Dec 2024, 12:57 | 0.18 | 0.18 mg/l |
| 20 Nov 2024, 10:44 | 0.53 | 0.53 mg/l |
| 18 Oct 2024, 09:07 | 0.64 | 0.64 mg/l |
| 26 Sep 2024, 08:57 | 0.47 | 0.47 mg/l |
| 29 Aug 2024, 14:57 | 1.2 | 1.2 mg/l |
| 30 Jul 2024, 11:13 | 1.2 | 1.2 mg/l |
| 17 Jun 2024, 11:40 | 0.45 | 0.45 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
1719 µS/cm
Sampled 6 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 May 2026, 10:19 | 1719 | 1719 µS/cm |
| 14 Apr 2026, 10:59 | 1935 | 1935 µS/cm |
| 2 Mar 2026, 13:18 | 1025 | 1025 µS/cm |
| 6 Feb 2026, 12:58 | 777 | 777 µS/cm |
| 1 Dec 2025, 11:24 | 1658 | 1658 µS/cm |
| 13 Nov 2025, 11:20 | 1485 | 1485 µS/cm |
| 7 Oct 2025, 13:55 | 7672 | 7672 µS/cm |
| 1 Sep 2025, 13:24 | 3608 | 3608 µS/cm |
| 1 Aug 2025, 08:53 | 1901 | 1901 µS/cm |
| 7 Jul 2025, 14:31 | 4922 | 4922 µS/cm |
| 3 Jun 2025, 09:54 | 1807 | 1807 µS/cm |
| 12 May 2025, 11:29 | 1862 | 1862 µS/cm |
| 8 Apr 2025, 11:30 | 2105 | 2105 µS/cm |
| 20 Mar 2025, 11:11 | 1848 | 1848 µS/cm |
| 12 Feb 2025, 11:32 | 1121 | 1121 µS/cm |
| 28 Jan 2025, 10:03 | 925 | 925 µS/cm |
| 11 Dec 2024, 12:57 | 1270 | 1270 µS/cm |
| 20 Nov 2024, 10:44 | 1154 | 1154 µS/cm |
| 18 Oct 2024, 09:07 | 1189 | 1189 µS/cm |
| 26 Sep 2024, 08:57 | 1098 | 1098 µS/cm |
| 29 Aug 2024, 14:57 | 1660 | 1660 µS/cm |
| 30 Jul 2024, 11:13 | 1659 | 1659 µS/cm |
| 17 Jun 2024, 11:40 | 1650 | 1650 µS/cm |
Everything measured here
14 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 14 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 23 | Jun 2024 – May 2026 | 76.9% 6 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 23 | Jun 2024 – May 2026 | 8.48 mg/l 6 May 2026 |
| Temperature of Water 0076 | River water | 23 | Jun 2024 – May 2026 | 10.9 °C 6 May 2026 |
| pH 0061 | River water | 23 | Jun 2024 – May 2026 | 8.03 6 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 23 | Jun 2024 – May 2026 | 0.17 mg/l 6 May 2026 |
| Nitrate as N 0117 | River water | 23 | Jun 2024 – May 2026 | 0.866 mg/l 6 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 23 | Jun 2024 – May 2026 | 0.29 mg/l 6 May 2026 |
| Conductivity at 25 C 0077 | River water | 23 | Jun 2024 – May 2026 | 1719 µS/cm 6 May 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 23 | Jun 2024 – May 2026 | 350 mg/l 6 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 23 | Jun 2024 – May 2026 | 0.00331 mg/l 6 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 22 | Jun 2024 – May 2026 | below 3 mg/l 6 May 2026 |
| Nitrite as N 0118 | River water | 23 | Jun 2024 – May 2026 | 0.044 mg/l 6 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 23 | Jun 2024 – May 2026 | 0.91 mg/l 6 May 2026 |
| No flow /No sample 7668 | River water | 1 | Jan 2026 – Jan 2026 | No flow/discharge at sampling point 6 Jan 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.