River Chelmer Felsted Mill
EA name: R.CHELMER FELSTED MILL
Environment Agency sampling point AN-CH08 · 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
- 29 Jan 2025, 11:5220 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 8 Oct 2026 and had nothing newer.
- Samples banked
- 16 since 13 Oct 2023 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 567100, 219649As published, to the nearest 1 m. Open in a map
- River, by its own name
- Chelmer
- River, by the map
- River ChelmerPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Felsted On the River Chelmer · 0.4 km along the river
- Nearest gauge upstream
- CHURCH END FGS GREAT DUNMOW DUAL COMMS 8.2 km along the river
- Why it was sampled
- Monitoring (national agency policy) (16 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
94.4%
Sampled 29 Jan 2025, 20 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 Jan 2025, 11:52 | 94.4 | 94.4% |
| 16 Dec 2024, 13:03 | 90.6 | 90.6% |
| 21 Nov 2024, 11:32 | 90.6 | 90.6% |
| 18 Oct 2024, 12:49 | 88.2 | 88.2% |
| 16 Sep 2024, 11:40 | 117.8 | 117.8% |
| 27 Aug 2024, 11:57 | 88.1 | 88.1% |
| 18 Jul 2024, 06:53 | 77.8 | 77.8% |
| 18 Jun 2024, 09:29 | 81.2 | 81.2% |
| 31 May 2024, 10:08 | 85.8 | 85.8% |
| 14 May 2024, 14:35 | 79.5 | 79.5% |
| 15 Apr 2024, 10:05 | 90.4 | 90.4% |
| 29 Feb 2024, 11:54 | 95 | 95% |
| 19 Jan 2024, 13:15 | 92.2 | 92.2% |
| 11 Dec 2023, 10:46 | 87.7 | 87.7% |
| 24 Nov 2023, 14:17 | 86.1 | 86.1% |
| 13 Oct 2023, 10:23 | 70.7 | 70.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.6 mg/l
Sampled 29 Jan 2025, 20 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 Jan 2025, 11:52 | 11.6 | 11.6 mg/l |
| 16 Dec 2024, 13:03 | 10.3 | 10.3 mg/l |
| 21 Nov 2024, 11:32 | 11.6 | 11.6 mg/l |
| 18 Oct 2024, 12:49 | 9.27 | 9.27 mg/l |
| 16 Sep 2024, 11:40 | 12.1 | 12.1 mg/l |
| 27 Aug 2024, 11:57 | 8.51 | 8.51 mg/l |
| 18 Jul 2024, 06:53 | 7.72 | 7.72 mg/l |
| 18 Jun 2024, 09:29 | 8.22 | 8.22 mg/l |
| 31 May 2024, 10:08 | 9.06 | 9.06 mg/l |
| 14 May 2024, 14:35 | 8.01 | 8.01 mg/l |
| 15 Apr 2024, 10:05 | 10.2 | 10.2 mg/l |
| 29 Feb 2024, 11:54 | 10.9 | 10.9 mg/l |
| 19 Jan 2024, 13:15 | 12.5 | 12.5 mg/l |
| 11 Dec 2023, 10:46 | 10.4 | 10.4 mg/l |
| 24 Nov 2023, 14:17 | 9.94 | 9.94 mg/l |
| 13 Oct 2023, 10:23 | 6.99 | 6.99 mg/l |
Water temperature
code 0076 · °C
6.5 °C
Sampled 29 Jan 2025, 20 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 Jan 2025, 11:52 | 6.5 | 6.5 °C |
| 16 Dec 2024, 13:03 | 9.7 | 9.7 °C |
| 21 Nov 2024, 11:32 | 4.9 | 4.9 °C |
| 18 Oct 2024, 12:49 | 13 | 13 °C |
| 16 Sep 2024, 11:40 | 13.9 | 13.9 °C |
| 27 Aug 2024, 11:57 | 16.9 | 16.9 °C |
| 18 Jul 2024, 06:53 | 15.6 | 15.6 °C |
| 18 Jun 2024, 09:29 | 14.7 | 14.7 °C |
| 31 May 2024, 10:08 | 12.8 | 12.8 °C |
| 14 May 2024, 14:35 | 14.9 | 14.9 °C |
| 15 Apr 2024, 10:05 | 10.1 | 10.1 °C |
| 29 Feb 2024, 11:54 | 9.4 | 9.4 °C |
| 19 Jan 2024, 13:15 | 2.7 | 2.7 °C |
| 11 Dec 2023, 10:46 | 7.7 | 7.7 °C |
| 24 Nov 2023, 14:17 | 9 | 9 °C |
| 13 Oct 2023, 10:23 | 15.8 | 15.8 °C |
pH
code 0061
8.23
Sampled 29 Jan 2025, 20 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 Jan 2025, 11:52 | 8.23 | 8.23 |
| 16 Dec 2024, 13:03 | 8.08 | 8.08 |
| 21 Nov 2024, 11:32 | 7.99 | 7.99 |
| 18 Oct 2024, 12:49 | 7.99 | 7.99 |
| 16 Sep 2024, 11:40 | 8.06 | 8.06 |
| 27 Aug 2024, 11:57 | 7.95 | 7.95 |
| 18 Jul 2024, 06:53 | 7.9 | 7.9 |
| 18 Jun 2024, 09:29 | 7.94 | 7.94 |
| 31 May 2024, 10:08 | 8.09 | 8.09 |
| 14 May 2024, 14:35 | 7.95 | 7.95 |
| 15 Apr 2024, 10:05 | 8.11 | 8.11 |
| 29 Feb 2024, 11:54 | 8.13 | 8.13 |
| 19 Jan 2024, 13:15 | 8.27 | 8.27 |
| 11 Dec 2023, 10:46 | 7.94 | 7.94 |
| 24 Nov 2023, 14:17 | 7.95 | 7.95 |
| 13 Oct 2023, 10:23 | 7.82 | 7.82 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.04 mg/l
Sampled 29 Jan 2025, 20 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 Jan 2025, 11:52 | 0.04 | 0.04 mg/l |
| 16 Dec 2024, 13:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Nov 2024, 11:32 | 0.034 | 0.034 mg/l |
| 18 Oct 2024, 12:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Sep 2024, 11:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Aug 2024, 11:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Jul 2024, 06:53 | 0.031 | 0.031 mg/l |
| 18 Jun 2024, 09:29 | 0.1 | 0.1 mg/l |
| 31 May 2024, 10:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 May 2024, 14:35 | 0.52 | 0.52 mg/l |
| 15 Apr 2024, 10:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 Feb 2024, 11:54 | 0.05 | 0.05 mg/l |
| 19 Jan 2024, 13:15 | 0.079 | 0.079 mg/l |
| 11 Dec 2023, 10:46 | 0.033 | 0.033 mg/l |
| 24 Nov 2023, 14:17 | 0.034 | 0.034 mg/l |
| 13 Oct 2023, 10:23 | 0.14 | 0.14 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
13 mg/l
Sampled 29 Jan 2025, 20 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 Jan 2025, 11:52 | 13 | 13 mg/l |
| 16 Dec 2024, 13:03 | 9.67 | 9.67 mg/l |
| 21 Nov 2024, 11:32 | 13 | 13 mg/l |
| 18 Oct 2024, 12:49 | 7.88 | 7.88 mg/l |
| 16 Sep 2024, 11:40 | 7.59 | 7.59 mg/l |
| 27 Aug 2024, 11:57 | 8.39 | 8.39 mg/l |
| 18 Jul 2024, 06:53 | 5.96 | 5.96 mg/l |
| 18 Jun 2024, 09:29 | 8.32 | 8.32 mg/l |
| 31 May 2024, 10:08 | 7.66 | 7.66 mg/l |
| 14 May 2024, 14:35 | 7.82 | 7.82 mg/l |
| 15 Apr 2024, 10:05 | 8.97 | 8.97 mg/l |
| 29 Feb 2024, 11:54 | 9.46 | 9.46 mg/l |
| 19 Jan 2024, 13:15 | 10.9 | 10.9 mg/l |
| 11 Dec 2023, 10:46 | 9.97 | 9.97 mg/l |
| 24 Nov 2023, 14:17 | 9.77 | 9.77 mg/l |
| 13 Oct 2023, 10:23 | 8.75 | 8.75 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.13 mg/l
Sampled 29 Jan 2025, 20 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 Jan 2025, 11:52 | 0.13 | 0.13 mg/l |
| 16 Dec 2024, 13:03 | 0.23 | 0.23 mg/l |
| 21 Nov 2024, 11:32 | 0.24 | 0.24 mg/l |
| 18 Oct 2024, 12:49 | 0.41 | 0.41 mg/l |
| 16 Sep 2024, 11:40 | 0.4 | 0.4 mg/l |
| 27 Aug 2024, 11:57 | 0.84 | 0.84 mg/l |
| 18 Jul 2024, 06:53 | 0.33 | 0.33 mg/l |
| 18 Jun 2024, 09:29 | 0.32 | 0.32 mg/l |
| 31 May 2024, 10:08 | 0.32 | 0.32 mg/l |
| 14 May 2024, 14:35 | 0.48 | 0.48 mg/l |
| 15 Apr 2024, 10:05 | 0.29 | 0.29 mg/l |
| 29 Feb 2024, 11:54 | 0.17 | 0.17 mg/l |
| 19 Jan 2024, 13:15 | 0.31 | 0.31 mg/l |
| 11 Dec 2023, 10:46 | 0.11 | 0.11 mg/l |
| 24 Nov 2023, 14:17 | 0.23 | 0.23 mg/l |
| 13 Oct 2023, 10:23 | 0.93 | 0.93 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
647 µS/cm
Sampled 29 Jan 2025, 20 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 Jan 2025, 11:52 | 647 | 647 µS/cm |
| 16 Dec 2024, 13:03 | 849 | 849 µS/cm |
| 21 Nov 2024, 11:32 | 750 | 750 µS/cm |
| 18 Oct 2024, 12:49 | 839 | 839 µS/cm |
| 16 Sep 2024, 11:40 | 869 | 869 µS/cm |
| 27 Aug 2024, 11:57 | 1003 | 1003 µS/cm |
| 18 Jul 2024, 06:53 | 694 | 694 µS/cm |
| 18 Jun 2024, 09:29 | 857 | 857 µS/cm |
| 31 May 2024, 10:08 | 826 | 826 µS/cm |
| 14 May 2024, 14:35 | 771 | 771 µS/cm |
| 15 Apr 2024, 10:05 | 847 | 847 µS/cm |
| 29 Feb 2024, 11:54 | 784 | 784 µS/cm |
| 19 Jan 2024, 13:15 | 952 | 952 µS/cm |
| 11 Dec 2023, 10:46 | 660 | 660 µS/cm |
| 24 Nov 2023, 14:17 | 812 | 812 µS/cm |
| 13 Oct 2023, 10:23 | 799 | 799 µS/cm |
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
6200 per 100 ml
Sampled 11 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2023, 10:46 | 6200 | 6200 per 100 ml |
| 24 Nov 2023, 14:17 | 290 | 290 per 100 ml |
| 13 Oct 2023, 10:23 | 17000 | 17000 per 100 ml |
Everything measured here
16 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 16 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 16 | Oct 2023 – Jan 2025 | 94.4% 29 Jan 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 16 | Oct 2023 – Jan 2025 | 11.6 mg/l 29 Jan 2025 |
| Temperature of Water 0076 | River water | 16 | Oct 2023 – Jan 2025 | 6.5 °C 29 Jan 2025 |
| pH 0061 | River water | 16 | Oct 2023 – Jan 2025 | 8.23 29 Jan 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 16 | Oct 2023 – Jan 2025 | 0.04 mg/l 29 Jan 2025 |
| Nitrate as N 0117 | River water | 16 | Oct 2023 – Jan 2025 | 13 mg/l 29 Jan 2025 |
| Orthophosphate, reactive as P 0180 | River water | 16 | Oct 2023 – Jan 2025 | 0.13 mg/l 29 Jan 2025 |
| Conductivity at 25 C 0077 | River water | 16 | Oct 2023 – Jan 2025 | 647 µS/cm 29 Jan 2025 |
| Escherichia coli : Confirmed : MF 2348 | River water | 3 | Oct 2023 – Dec 2023 | 6200 per 100 ml 11 Dec 2023 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 16 | Oct 2023 – Jan 2025 | 220 mg/l 29 Jan 2025 |
| Ammonia un-ionised as N 0119 | River water | 16 | Oct 2023 – Jan 2025 | 0.00056 mg/l 29 Jan 2025 |
| BOD : 5 Day ATU 0085 | River water | 16 | Oct 2023 – Jan 2025 | 1.5 mg/l 29 Jan 2025 |
| Enterococci: Intestinal: Confirmed: MF 3723 | River water | 3 | Oct 2023 – Dec 2023 | 2500 colony forming units / 100ml 11 Dec 2023 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 3 | Oct 2023 – Dec 2023 | 2800 colony forming units / 100ml 11 Dec 2023 |
| Nitrite as N 0118 | River water | 16 | Oct 2023 – Jan 2025 | 0.029 mg/l 29 Jan 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 16 | Oct 2023 – Jan 2025 | 13 mg/l 29 Jan 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.