Bydemill Farm
EA name: RSN1318 BYDEMILL FARM
Environment Agency sampling point TH-RSN1318 · 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
- 12 Dec 2025, 13:1310 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
- 13 since 31 Jan 2025 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 418678, 193170As published, to the nearest 1 m. Open in a map
- River, by its own name
- Bydemill
- River, by the map
- Bydemill BrookPlaced on a river whose name partly matches its own, 1 m from the line.
- Next gauge downstream
- St Johns Lock On the River Thames · 11 km along the river
- Why it was sampled
- Monitoring (national agency policy) (13 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
87.1%
Sampled 12 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2025, 13:13 | 87.1 | 87.1% |
| 19 Nov 2025, 10:03 | 86.3 | 86.3% |
| 3 Oct 2025, 13:35 | 82 | 82% |
| 16 Sep 2025, 14:20 | 89.5 | 89.5% |
| 29 Jul 2025, 12:59 | 82.5 | 82.5% |
| 26 Jun 2025, 11:36 | 80.4 | 80.4% |
| 29 May 2025, 13:12 | 91.1 | 91.1% |
| 24 Apr 2025, 12:40 | 99.5 | 99.5% |
| 26 Mar 2025, 13:23 | 105.9 | 105.9% |
| 17 Feb 2025, 12:52 | 100 | 100% |
| 31 Jan 2025, 14:34 | 92.6 | 92.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.83 mg/l
Sampled 12 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2025, 13:13 | 9.83 | 9.83 mg/l |
| 19 Nov 2025, 10:03 | 10.6 | 10.6 mg/l |
| 3 Oct 2025, 13:35 | 8.54 | 8.54 mg/l |
| 16 Sep 2025, 14:20 | 9.38 | 9.38 mg/l |
| 29 Jul 2025, 12:59 | 8.33 | 8.33 mg/l |
| 26 Jun 2025, 11:36 | 7.85 | 7.85 mg/l |
| 29 May 2025, 13:12 | 9.08 | 9.08 mg/l |
| 24 Apr 2025, 12:40 | 11 | 11 mg/l |
| 26 Mar 2025, 13:23 | 12 | 12 mg/l |
| 17 Feb 2025, 12:52 | 12.9 | 12.9 mg/l |
| 31 Jan 2025, 14:34 | 11.5 | 11.5 mg/l |
Water temperature
code 0076 · °C
9.9 °C
Sampled 12 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2025, 13:13 | 9.9 | 9.9 °C |
| 19 Nov 2025, 10:03 | 6.4 | 6.4 °C |
| 3 Oct 2025, 13:35 | 13.4 | 13.4 °C |
| 16 Sep 2025, 14:20 | 13.1 | 13.1 °C |
| 29 Jul 2025, 12:59 | 14.8 | 14.8 °C |
| 26 Jun 2025, 11:36 | 16.4 | 16.4 °C |
| 29 May 2025, 13:12 | 15.4 | 15.4 °C |
| 24 Apr 2025, 12:40 | 10.7 | 10.7 °C |
| 26 Mar 2025, 13:23 | 9.7 | 9.7 °C |
| 17 Feb 2025, 12:52 | 4.6 | 4.6 °C |
| 31 Jan 2025, 14:34 | 6.2 | 6.2 °C |
pH
code 0061
8.02
Sampled 12 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2025, 13:13 | 8.02 | 8.02 |
| 19 Nov 2025, 10:03 | 8.09 | 8.09 |
| 3 Oct 2025, 13:35 | 8 | 8 |
| 16 Sep 2025, 14:20 | 8.18 | 8.18 |
| 29 Jul 2025, 12:59 | 8.08 | 8.08 |
| 26 Jun 2025, 11:36 | 8.2 | 8.2 |
| 29 May 2025, 13:12 | 8.1 | 8.1 |
| 24 Apr 2025, 12:40 | 8.2 | 8.2 |
| 26 Mar 2025, 13:23 | 8.3 | 8.3 |
| 17 Feb 2025, 12:52 | 8.1 | 8.1 |
| 31 Jan 2025, 14:34 | 8.1 | 8.1 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 12 Dec 2025, 10 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2025, 13:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Nov 2025, 10:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Oct 2025, 13:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Sep 2025, 14:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Aug 2025, 12:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 Jul 2025, 12:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Jun 2025, 11:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 May 2025, 13:12 | 0.041 | 0.041 mg/l |
| 24 Apr 2025, 12:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Mar 2025, 13:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Feb 2025, 12:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 31 Jan 2025, 14:34 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.09 mg/l
Sampled 12 Dec 2025, 10 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2025, 13:13 | 4.09 | 4.09 mg/l |
| 19 Nov 2025, 10:03 | 3.49 | 3.49 mg/l |
| 3 Oct 2025, 13:35 | 3.69 | 3.69 mg/l |
| 16 Sep 2025, 14:20 | 3.1 | 3.1 mg/l |
| 12 Aug 2025, 12:09 | 4.49 | 4.49 mg/l |
| 29 Jul 2025, 12:59 | 4.7 | 4.7 mg/l |
| 26 Jun 2025, 11:36 | 4.09 | 4.09 mg/l |
| 29 May 2025, 13:12 | 3.68 | 3.68 mg/l |
| 24 Apr 2025, 12:40 | 3.99 | 3.99 mg/l |
| 26 Mar 2025, 13:23 | 4.29 | 4.29 mg/l |
| 17 Feb 2025, 12:52 | 4.29 | 4.29 mg/l |
| 31 Jan 2025, 14:34 | 3.29 | 3.29 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.039 mg/l
Sampled 12 Dec 2025, 10 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2025, 13:13 | 0.039 | 0.039 mg/l |
| 19 Nov 2025, 10:03 | 0.036 | 0.036 mg/l |
| 3 Oct 2025, 13:35 | 0.048 | 0.048 mg/l |
| 16 Sep 2025, 14:20 | 0.054 | 0.054 mg/l |
| 12 Aug 2025, 12:09 | 0.055 | 0.055 mg/l |
| 29 Jul 2025, 12:59 | 0.06 | 0.06 mg/l |
| 26 Jun 2025, 11:36 | 0.05 | 0.05 mg/l |
| 29 May 2025, 13:12 | 0.044 | 0.044 mg/l |
| 24 Apr 2025, 12:40 | 0.016 | 0.016 mg/l |
| 26 Mar 2025, 13:23 | 0.013 | 0.013 mg/l |
| 17 Feb 2025, 12:52 | 0.02 | 0.02 mg/l |
| 31 Jan 2025, 14:34 | 0.029 | 0.029 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
764 µS/cm
Sampled 12 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2025, 13:13 | 764 | 764 µS/cm |
| 19 Nov 2025, 10:03 | 806 | 806 µS/cm |
| 3 Oct 2025, 13:35 | 781 | 781 µS/cm |
| 16 Sep 2025, 14:20 | 728 | 728 µS/cm |
| 29 Jul 2025, 12:59 | 750 | 750 µS/cm |
| 26 Jun 2025, 11:36 | 748 | 748 µS/cm |
| 29 May 2025, 13:12 | 761 | 761 µS/cm |
| 24 Apr 2025, 12:40 | 744 | 744 µS/cm |
| 26 Mar 2025, 13:23 | 752 | 752 µS/cm |
| 17 Feb 2025, 12:52 | 767 | 767 µS/cm |
| 31 Jan 2025, 14:34 | 640 | 640 µS/cm |
Everything measured here
123 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 123 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 11 | Jan 2025 – Dec 2025 | 87.1% 12 Dec 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 11 | Jan 2025 – Dec 2025 | 9.83 mg/l 12 Dec 2025 |
| Temperature of Water 0076 | River water | 11 | Jan 2025 – Dec 2025 | 9.9 °C 12 Dec 2025 |
| pH 0061 | River water | 11 | Jan 2025 – Dec 2025 | 8.02 12 Dec 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 12 | Jan 2025 – Dec 2025 | below 0.03 mg/l 12 Dec 2025 |
| Nitrate as N 0117 | River water | 12 | Jan 2025 – Dec 2025 | 4.09 mg/l 12 Dec 2025 |
| Orthophosphate, reactive as P 0180 | River water | 12 | Jan 2025 – Dec 2025 | 0.039 mg/l 12 Dec 2025 |
| Conductivity at 25 C 0077 | River water | 11 | Jan 2025 – Dec 2025 | 764 µS/cm 12 Dec 2025 |
| 17alpha ethynyloestradiol :- {EE2} 9899 | River water | 1 | Jan 2025 – Jan 2025 | 0.052 nanogram per litre 31 Jan 2025 |
| 17beta oestradiol :- {E2} 9898 | River water | 1 | Jan 2025 – Jan 2025 | below 0.03 nanogram per litre 31 Jan 2025 |
| 2,3,6-TBA :- {2,3,6-Trichlorobenzoic acid} 7726 | River water | 5 | Jan 2025 – May 2025 | below 0.02 µg/l 29 May 2025 |
| 2,4,5-T :- {2,4,5-Trichlorophenoxyacetic acid} 3546 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| 2,4-D :- {2,4-Dichlorophenoxyacetic acid} 3545 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| 2,4-DB :- {4-(2,4-dichlorophenoxy)butyric acid} 3791 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| 2-Phenoxypropionic acid :- {PPA} 6673 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| 4-Chloro-2-methylphenol :- {p-Chloro-o-cresol} 3341 | River water | 5 | Jan 2025 – May 2025 | below 0.05 µg/l 29 May 2025 |
| 4-Chlorophenoxyacetic acid 3547 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| 4-Nonylphenol Branched 9190 | River water | 5 | Jan 2025 – May 2025 | below 0.04 µg/l 29 May 2025 |
| 4-Phenoxybutyric acid :- {PBA} 6672 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| 4-tert-Octylphenol :- {p-tert-Octylphenol} 9267 | River water | 5 | Jan 2025 – May 2025 | below 0.01 µg/l 29 May 2025 |
| Aldicarb 9344 | River water | 5 | Jan 2025 – May 2025 | below 0.05 µg/l 29 May 2025 |
| Aldicarb sulfoxide 8806 | River water | 5 | Jan 2025 – May 2025 | below 0.05 µg/l 29 May 2025 |
| Aldoxycarb :- {Aldicarb Sulfone} 8807 | River water | 5 | Jan 2025 – May 2025 | below 0.05 µg/l 29 May 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 12 | Jan 2025 – Dec 2025 | 280 mg/l 12 Dec 2025 |
| Aluminium, Dissolved 6037 | River water | 5 | Jan 2025 – May 2025 | below 20 µg/l 29 May 2025 |
| Aminomethylphosphonic acid 7125 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Ammonia un-ionised as N 0119 | River water | 11 | Jan 2025 – Dec 2025 | below 0.00054 mg/l 12 Dec 2025 |
| Asulam 3004 | River water | 5 | Jan 2025 – May 2025 | below 0.2 µg/l 29 May 2025 |
| Azoxystrobin 5050 | River water | 5 | Jan 2025 – May 2025 | below 0.2 µg/l 29 May 2025 |
| Barium, Dissolved 9446 | River water | 5 | Jan 2025 – May 2025 | 15 µg/l 29 May 2025 |
| Benazolin 3792 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| Bentazone 4065 | River water | 5 | Jan 2025 – May 2025 | below 0.003 µg/l 29 May 2025 |
| Benzo(a)Pyrene 6399 | River water | 3 | Jan 2025 – May 2025 | 0.017 µg/l 29 May 2025 |
| Benzo(b)Fluoranthene 0731 | River water | 3 | Jan 2025 – May 2025 | 0.016 µg/l 29 May 2025 |
| Benzo(g,h,i)Perylene 0714 | River water | 3 | Jan 2025 – May 2025 | 0.016 µg/l 29 May 2025 |
| Benzo(k)Fluoranthene 0733 | River water | 2 | Jan 2025 – Feb 2025 | 0.0014 µg/l 17 Feb 2025 |
| Boron, Dissolved 9447 | River water | 5 | Jan 2025 – May 2025 | below 100 µg/l 29 May 2025 |
| Bromoxynil 6449 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| Cadmium, Dissolved 0106 | River water | 5 | Jan 2025 – May 2025 | below 0.01 µg/l 29 May 2025 |
| Calcium, Dissolved 0239 | River water | 5 | Jan 2025 – May 2025 | 130 mg/l 29 May 2025 |
| Carbaryl 9343 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Carbendazim 3475 | River water | 4 | Feb 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Carbetamide 9073 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Carbofuran 3086 | River water | 5 | Jan 2025 – May 2025 | below 0.05 µg/l 29 May 2025 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 12 | Jan 2025 – Dec 2025 | 4.6 mg/l 12 Dec 2025 |
| Chloridazon 6760 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Chloride 0172 | River water | 12 | Jan 2025 – Dec 2025 | 36 mg/l 12 Dec 2025 |
| Chlorotoluron 9348 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Chloroxuron 3399 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Chromium, Dissolved 3409 | River water | 5 | Jan 2025 – May 2025 | below 0.5 µg/l 29 May 2025 |
| cis-Permethrin 9341 | River water | 4 | Jan 2025 – May 2025 | below 0.0001 µg/l 29 May 2025 |
| Clopyralid 6620 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| Copper : BLM Bioavailable 4821 | River water | 5 | Jan 2025 – May 2025 | 0.5 µg/l 29 May 2025 |
| Copper, Dissolved 6450 | River water | 5 | Jan 2025 – May 2025 | 3.6 µg/l 29 May 2025 |
| Cypermethrin 0073 | River water | 4 | Jan 2025 – May 2025 | below 0.00002 µg/l 29 May 2025 |
| Cypermethrin Identification 5446 | River water | 4 | Jan 2025 – May 2025 | 1 text result 29 May 2025 |
| Di(2-ethylhexyl) phthalate :- {DEHP} 6724 | River water | 5 | Jan 2025 – May 2025 | below 0.2 µg/l 29 May 2025 |
| Dicamba 3550 | River water | 5 | Jan 2025 – May 2025 | below 0.01 µg/l 29 May 2025 |
| Dichlorprop :- {2,4-DP} 3551 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| Diflurobenzuron 9345 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Diuron 3811 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Ethiofencarb 6955 | River water | 5 | Jan 2025 – May 2025 | below 0.05 µg/l 29 May 2025 |
| Ethirimol 5047 | River water | 5 | Jan 2025 – May 2025 | below 0.5 µg/l 29 May 2025 |
| Fenoprop 3552 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| Fenuron 9339 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Flow Type 2896 | River water | 11 | Jan 2025 – Dec 2025 | Moderate Flow 12 Dec 2025 |
| Fluoranthene 0736 | River water | 3 | Jan 2025 – May 2025 | 0.027 µg/l 29 May 2025 |
| Fluroxypyr 4064 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 5 | Jan 2025 – May 2025 | 1 text result 29 May 2025 |
| Glyphosate 3007 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Hardness, Calcium 0163 | River water | 5 | Jan 2025 – May 2025 | 325 mg/l 29 May 2025 |
| Hardness, Total as CaCO3 0158 | River water | 5 | Jan 2025 – May 2025 | 348 mg/l 29 May 2025 |
| Imazapyr 7025 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| Indeno(1,2,3-cd)pyrene 0746 | River water | 3 | Jan 2025 – May 2025 | 0.015 µg/l 29 May 2025 |
| Ioxynil 9068 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| Iron, Dissolved 6460 | River water | 5 | Jan 2025 – May 2025 | below 30 µg/l 29 May 2025 |
| Isoproturon 3117 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| LCMS Screen : Semi Quantitative 7299 | River water | 4 | Feb 2025 – May 2025 | 1 text result 29 May 2025 |
| Lead : BLM Bioavailable 3377 | River water | 5 | Jan 2025 – May 2025 | 0.02 µg/l 29 May 2025 |
| Lead, Dissolved 0052 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Linuron 3118 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Lithium, Dissolved 4201 | River water | 5 | Jan 2025 – May 2025 | below 100 µg/l 29 May 2025 |
| Magnesium, Dissolved 0235 | River water | 5 | Jan 2025 – May 2025 | 5.6 mg/l 29 May 2025 |
| Manganese : BLM Bioavailable 4820 | River water | 5 | Jan 2025 – May 2025 | 7.5 µg/l 29 May 2025 |
| Manganese, Dissolved 6458 | River water | 5 | Jan 2025 – May 2025 | 11 µg/l 29 May 2025 |
| MCPA :- {4-Chloro-2-methylphenoxyacetic acid} 3548 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| MCPB :- {4-Chloro-2-methylphenoxybutyric acid} 3790 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| Mecoprop 3549 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| Methabenzthiazuron 7053 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Methiocarb 6971 | River water | 5 | Jan 2025 – May 2025 | below 0.01 µg/l 29 May 2025 |
| Methomyl 6972 | River water | 5 | Jan 2025 – May 2025 | below 0.05 µg/l 29 May 2025 |
| Metoxuron 3130 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Metsulfuron-methyl 9861 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Monolinuron 3925 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Monuron 3400 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Neburon 9756 | River water | 5 | Jan 2025 – May 2025 | below 0.1 µg/l 29 May 2025 |
| Nickel : BLM Bioavailable 3878 | River water | 5 | Jan 2025 – May 2025 | 0.69 µg/l 29 May 2025 |
| Nickel, Dissolved 3410 | River water | 5 | Jan 2025 – May 2025 | 1.3 µg/l 29 May 2025 |
| Nitrite as N 0118 | River water | 12 | Jan 2025 – Dec 2025 | 0.0072 mg/l 12 Dec 2025 |
| Nitrogen, Total as N 9686 | River water | 12 | Jan 2025 – Dec 2025 | 4.4 mg/l 12 Dec 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 12 | Jan 2025 – Dec 2025 | 4.1 mg/l 12 Dec 2025 |
| Oestrone :- {E1} 9889 | River water | 1 | Jan 2025 – Jan 2025 | 0.16 nanogram per litre 31 Jan 2025 |
| Oxamyl 6980 | River water | 5 | Jan 2025 – May 2025 | below 0.05 µg/l 29 May 2025 |
| Perfluorooctanoate anion 9274 | River water | 5 | Jan 2025 – May 2025 | below 0.003 µg/l 29 May 2025 |
| Perfluorooctylsulphonate anion 9276 | River water | 5 | Jan 2025 – May 2025 | 0.00087 µg/l 29 May 2025 |
| Phenoxyacetic acid :- {PAA} 6671 | River water | 5 | Jan 2025 – May 2025 | 0.023 µg/l 29 May 2025 |
| Phosphorus, Total as P 0348 | River water | 12 | Jan 2025 – Dec 2025 | 0.046 mg/l 12 Dec 2025 |
| Picloram 9883 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| Potassium, Dissolved 0209 | River water | 5 | Jan 2025 – May 2025 | 5.1 mg/l 29 May 2025 |
| Propoxur 6987 | River water | 5 | Jan 2025 – May 2025 | below 0.05 µg/l 29 May 2025 |
| Silica, reactive as SiO2 0182 | River water | 12 | Jan 2025 – Dec 2025 | 12 mg/l 12 Dec 2025 |
| Sodium, Dissolved 0205 | River water | 5 | Jan 2025 – May 2025 | 19 mg/l 29 May 2025 |
| Solids, Suspended at 105 C 0135 | River water | 1 | Dec 2025 – Dec 2025 | 7.4 mg/l 12 Dec 2025 |
| Strontium, Filtered 6693 | River water | 5 | Jan 2025 – May 2025 | 390 µg/l 29 May 2025 |
| Sulcotrione 5042 | River water | 4 | Feb 2025 – May 2025 | below 1 µg/l 29 May 2025 |
| Sulphate, Dissolved as SO4 7859 | River water | 5 | Jan 2025 – May 2025 | 51 mg/l 29 May 2025 |
| trans-Permethrin 9342 | River water | 4 | Jan 2025 – May 2025 | below 0.0001 µg/l 29 May 2025 |
| Tributyl Tin as Cation 8944 | River water | 4 | Jan 2025 – Apr 2025 | below 0.0002 µg/l 24 Apr 2025 |
| Triclopyr 3555 | River water | 5 | Jan 2025 – May 2025 | below 0.005 µg/l 29 May 2025 |
| Triclosan 5889 | River water | 5 | Jan 2025 – May 2025 | below 0.01 µg/l 29 May 2025 |
| Triphenyl Tin as Cation 5732 | River water | 4 | Jan 2025 – Apr 2025 | below 0.0002 µg/l 24 Apr 2025 |
| Zinc : BLM Bioavailable 4822 | River water | 5 | Jan 2025 – May 2025 | 1.9 µg/l 29 May 2025 |
| Zinc, Dissolved 3408 | River water | 5 | Jan 2025 – May 2025 | 4 µg/l 29 May 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.