Colne upstream M4
EA name: COLNE UPSTREAM M4 (also listed as “RSN0962 - COLNE UPSTREAM M4”)
Environment Agency sampling point TH-RSN0962 · 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
- 7 Dec 2023, 13:002.9 years 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 24 Oct 2026 and had nothing newer.
- Samples banked
- 3 since 12 Oct 2023 Imported periods: 1 Oct 2023 – 24 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 505335, 178596As published, to the nearest 1 m. Open in a map
- River, by its own name
- Colne
- River, by the map
- River ColnePlaced on the river its name gives, 12 m from the line.
- Next gauge downstream
- Stanwell Mill On the River Colne · 4.1 km along the river
- Nearest gauge upstream
- West Drayton On the River Colne · 0.6 km along the riverThorney Mill Road, West Drayton (Temporary) On the River Colne · 0.6 km along the riverYiewsley On the Frays River · 1.8 km along the river
- Why it was sampled
- Monitoring (national agency policy) (3 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
93.5%
Sampled 7 Dec 2023, 2.9 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Dec 2023, 13:00 | 93.5 | 93.5% |
| 22 Nov 2023, 11:57 | 90.1 | 90.1% |
| 12 Oct 2023, 13:45 | 82.8 | 82.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.1 mg/l
Sampled 7 Dec 2023, 2.9 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Dec 2023, 13:00 | 11.1 | 11.1 mg/l |
| 22 Nov 2023, 11:57 | 10.1 | 10.1 mg/l |
| 12 Oct 2023, 13:45 | 8.16 | 8.16 mg/l |
Water temperature
code 0076 · °C
7.9 °C
Sampled 7 Dec 2023, 2.9 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Dec 2023, 13:00 | 7.9 | 7.9 °C |
| 22 Nov 2023, 11:57 | 10.3 | 10.3 °C |
| 12 Oct 2023, 13:45 | 15.9 | 15.9 °C |
pH
code 0061
8.02
Sampled 7 Dec 2023, 2.9 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Dec 2023, 13:00 | 8.02 | 8.02 |
| 22 Nov 2023, 11:57 | 7.95 | 7.95 |
| 12 Oct 2023, 13:45 | 8 | 8 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.041 mg/l
Sampled 7 Dec 2023, 2.9 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Dec 2023, 13:00 | 0.041 | 0.041 mg/l |
| 22 Nov 2023, 11:57 | 0.035 | 0.035 mg/l |
| 12 Oct 2023, 13:45 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
9.28 mg/l
Sampled 7 Dec 2023, 2.9 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Dec 2023, 13:00 | 9.28 | 9.28 mg/l |
| 22 Nov 2023, 11:57 | 8.87 | 8.87 mg/l |
| 12 Oct 2023, 13:45 | 11 | 11 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.29 mg/l
Sampled 7 Dec 2023, 2.9 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Dec 2023, 13:00 | 0.29 | 0.29 mg/l |
| 22 Nov 2023, 11:57 | 0.26 | 0.26 mg/l |
| 12 Oct 2023, 13:45 | 0.3 | 0.3 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
783 µS/cm
Sampled 7 Dec 2023, 2.9 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Dec 2023, 13:00 | 783 | 783 µS/cm |
| 22 Nov 2023, 11:57 | 768 | 768 µS/cm |
| 12 Oct 2023, 13:45 | 788 | 788 µS/cm |
Everything measured here
111 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 111 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 3 | Oct 2023 – Dec 2023 | 93.5% 7 Dec 2023 |
| Oxygen, Dissolved as O2 9924 | River water | 3 | Oct 2023 – Dec 2023 | 11.1 mg/l 7 Dec 2023 |
| Temperature of Water 0076 | River water | 3 | Oct 2023 – Dec 2023 | 7.9 °C 7 Dec 2023 |
| pH 0061 | River water | 3 | Oct 2023 – Dec 2023 | 8.02 7 Dec 2023 |
| Ammoniacal Nitrogen as N 0111 | River water | 3 | Oct 2023 – Dec 2023 | 0.041 mg/l 7 Dec 2023 |
| Nitrate as N 0117 | River water | 3 | Oct 2023 – Dec 2023 | 9.28 mg/l 7 Dec 2023 |
| Orthophosphate, reactive as P 0180 | River water | 3 | Oct 2023 – Dec 2023 | 0.29 mg/l 7 Dec 2023 |
| Conductivity at 25 C 0077 | River water | 3 | Oct 2023 – Dec 2023 | 783 µS/cm 7 Dec 2023 |
| 2,3,6-TBA :- {2,3,6-Trichlorobenzoic acid} 7726 | River water | 3 | Oct 2023 – Dec 2023 | below 0.02 µg/l 7 Dec 2023 |
| 2,4,5-T :- {2,4,5-Trichlorophenoxyacetic acid} 3546 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| 2,4-D :- {2,4-Dichlorophenoxyacetic acid} 3545 | River water | 3 | Oct 2023 – Dec 2023 | 0.017 µg/l 7 Dec 2023 |
| 2,4-DB :- {4-(2,4-dichlorophenoxy)butyric acid} 3791 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| 2-Phenoxypropionic acid :- {PPA} 6673 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| 4-Chloro-2-methylphenol :- {p-Chloro-o-cresol} 3341 | River water | 3 | Oct 2023 – Dec 2023 | below 0.05 µg/l 7 Dec 2023 |
| 4-Chlorophenoxyacetic acid 3547 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| 4-Phenoxybutyric acid :- {PBA} 6672 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Aldicarb 9344 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Aldicarb sulfoxide 8806 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Aldoxycarb :- {Aldicarb Sulfone} 8807 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 3 | Oct 2023 – Dec 2023 | 220 mg/l 7 Dec 2023 |
| Aluminium, Dissolved 6037 | River water | 3 | Oct 2023 – Dec 2023 | 11 µg/l 7 Dec 2023 |
| Ammonia un-ionised as N 0119 | River water | 3 | Oct 2023 – Dec 2023 | 0.00064 mg/l 7 Dec 2023 |
| Asulam 3004 | River water | 2 | Oct 2023 – Nov 2023 | below 0.02 µg/l 22 Nov 2023 |
| Azoxystrobin 5050 | River water | 3 | Oct 2023 – Dec 2023 | below 0.02 µg/l 7 Dec 2023 |
| Barium, Dissolved 9446 | River water | 3 | Oct 2023 – Dec 2023 | 27 µg/l 7 Dec 2023 |
| Benazolin 3792 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Bentazone 4065 | River water | 3 | Oct 2023 – Dec 2023 | below 0.003 µg/l 7 Dec 2023 |
| Benzo(a)Pyrene 6399 | River water | 3 | Oct 2023 – Dec 2023 | 0.0046 µg/l 7 Dec 2023 |
| Benzo(b)Fluoranthene 0731 | River water | 3 | Oct 2023 – Dec 2023 | 0.0046 µg/l 7 Dec 2023 |
| Benzo(g,h,i)Perylene 0714 | River water | 3 | Oct 2023 – Dec 2023 | 0.0071 µg/l 7 Dec 2023 |
| Benzo(k)Fluoranthene 0733 | River water | 3 | Oct 2023 – Dec 2023 | 0.0023 µg/l 7 Dec 2023 |
| Boron, Dissolved 9447 | River water | 3 | Oct 2023 – Dec 2023 | below 100 µg/l 7 Dec 2023 |
| Bromoxynil 6449 | River water | 2 | Nov 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Cadmium, Dissolved 0106 | River water | 3 | Oct 2023 – Dec 2023 | 0.017 µg/l 7 Dec 2023 |
| Calcium, Dissolved 0239 | River water | 3 | Oct 2023 – Dec 2023 | 110 mg/l 7 Dec 2023 |
| Carbaryl 9343 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Carbendazim 3475 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Carbetamide 9073 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Carbofuran 3086 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 3 | Oct 2023 – Dec 2023 | 4 mg/l 7 Dec 2023 |
| Chloridazon 6760 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Chloride 0172 | River water | 3 | Oct 2023 – Dec 2023 | 70 mg/l 7 Dec 2023 |
| Chlorotoluron 9348 | River water | 2 | Nov 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Chloroxuron 3399 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Chromium, Dissolved 3409 | River water | 3 | Oct 2023 – Dec 2023 | below 0.5 µg/l 7 Dec 2023 |
| cis-Permethrin 9341 | River water | 3 | Oct 2023 – Dec 2023 | below 0.0001 µg/l 7 Dec 2023 |
| Clopyralid 6620 | River water | 3 | Oct 2023 – Dec 2023 | 0.013 µg/l 7 Dec 2023 |
| Copper : BLM Bioavailable 4821 | River water | 3 | Oct 2023 – Dec 2023 | 0.35 µg/l 7 Dec 2023 |
| Copper, Dissolved 6450 | River water | 3 | Oct 2023 – Dec 2023 | 3.6 µg/l 7 Dec 2023 |
| Cypermethrin 0073 | River water | 3 | Oct 2023 – Dec 2023 | below 0.00003 µg/l 7 Dec 2023 |
| Cypermethrin Identification 5446 | River water | 3 | Oct 2023 – Dec 2023 | 1 text result 7 Dec 2023 |
| Dicamba 3550 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Dichlorprop :- {2,4-DP} 3551 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Diflurobenzuron 9345 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Diuron 3811 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Ethiofencarb 6955 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Ethirimol 5047 | River water | 3 | Oct 2023 – Dec 2023 | below 0.05 µg/l 7 Dec 2023 |
| Fenoprop 3552 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Fenuron 9339 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Fluoranthene 0736 | River water | 3 | Oct 2023 – Dec 2023 | 0.0081 µg/l 7 Dec 2023 |
| Fluroxypyr 4064 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 3 | Oct 2023 – Dec 2023 | 1 text result 7 Dec 2023 |
| Hardness, Calcium 0163 | River water | 3 | Oct 2023 – Dec 2023 | 275 mg/l 7 Dec 2023 |
| Hardness, Total as CaCO3 0158 | River water | 3 | Oct 2023 – Dec 2023 | 294 mg/l 7 Dec 2023 |
| Imazapyr 7025 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Indeno(1,2,3-cd)pyrene 0746 | River water | 3 | Oct 2023 – Dec 2023 | 0.0074 µg/l 7 Dec 2023 |
| Ioxynil 9068 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Iron, Dissolved 6460 | River water | 3 | Oct 2023 – Dec 2023 | 36 µg/l 7 Dec 2023 |
| Isoproturon 3117 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Lead : BLM Bioavailable 3377 | River water | 3 | Oct 2023 – Dec 2023 | 0.06 µg/l 7 Dec 2023 |
| Lead, Dissolved 0052 | River water | 3 | Oct 2023 – Dec 2023 | 0.22 µg/l 7 Dec 2023 |
| Linuron 3118 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Lithium, Dissolved 4201 | River water | 3 | Oct 2023 – Dec 2023 | below 100 µg/l 7 Dec 2023 |
| Magnesium, Dissolved 0235 | River water | 3 | Oct 2023 – Dec 2023 | 4.8 mg/l 7 Dec 2023 |
| Manganese : BLM Bioavailable 4820 | River water | 3 | Oct 2023 – Dec 2023 | 3.4 µg/l 7 Dec 2023 |
| Manganese, Dissolved 6458 | River water | 3 | Oct 2023 – Dec 2023 | below 10 µg/l 7 Dec 2023 |
| MCPA :- {4-Chloro-2-methylphenoxyacetic acid} 3548 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| MCPB :- {4-Chloro-2-methylphenoxybutyric acid} 3790 | River water | 2 | Nov 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Mecoprop 3549 | River water | 3 | Oct 2023 – Dec 2023 | 0.016 µg/l 7 Dec 2023 |
| Methabenzthiazuron 7053 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Methiocarb 6971 | River water | 3 | Oct 2023 – Dec 2023 | below 0.001 µg/l 7 Dec 2023 |
| Methomyl 6972 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Metoxuron 3130 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Metsulfuron-methyl 9861 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Monolinuron 3925 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Monuron 3400 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Neburon 9756 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 7 Dec 2023 |
| Nickel : BLM Bioavailable 3878 | River water | 3 | Oct 2023 – Dec 2023 | 0.9 µg/l 7 Dec 2023 |
| Nickel, Dissolved 3410 | River water | 3 | Oct 2023 – Dec 2023 | 1.9 µg/l 7 Dec 2023 |
| Nitrite as N 0118 | River water | 3 | Oct 2023 – Dec 2023 | 0.023 mg/l 7 Dec 2023 |
| Nitrogen, Total as N 9686 | River water | 3 | Oct 2023 – Dec 2023 | 10 mg/l 7 Dec 2023 |
| Nitrogen, Total Oxidised as N 0116 | River water | 3 | Oct 2023 – Dec 2023 | 9.3 mg/l 7 Dec 2023 |
| Oxamyl 6980 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Perfluorooctanoate anion 9274 | River water | 1 | Dec 2023 – Dec 2023 | 0.0041 µg/l 7 Dec 2023 |
| Perfluorooctylsulphonate anion 9276 | River water | 1 | Dec 2023 – Dec 2023 | 0.0058 µg/l 7 Dec 2023 |
| Phenoxyacetic acid :- {PAA} 6671 | River water | 2 | Oct 2023 – Nov 2023 | 0.037 µg/l 22 Nov 2023 |
| Phosphorus, Total as P 0348 | River water | 3 | Oct 2023 – Dec 2023 | 0.32 mg/l 7 Dec 2023 |
| Picloram 9883 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Potassium, Dissolved 0209 | River water | 3 | Oct 2023 – Dec 2023 | 7.3 mg/l 7 Dec 2023 |
| Propoxur 6987 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Silica, reactive as SiO2 0182 | River water | 3 | Oct 2023 – Dec 2023 | 14 mg/l 7 Dec 2023 |
| Sodium, Dissolved 0205 | River water | 3 | Oct 2023 – Dec 2023 | 45 mg/l 7 Dec 2023 |
| Strontium, Filtered 6693 | River water | 3 | Oct 2023 – Dec 2023 | 300 µg/l 7 Dec 2023 |
| Sulcotrione 5042 | River water | 3 | Oct 2023 – Dec 2023 | below 0.1 µg/l 7 Dec 2023 |
| Sulphate, Dissolved as SO4 7859 | River water | 3 | Oct 2023 – Dec 2023 | 48 mg/l 7 Dec 2023 |
| trans-Permethrin 9342 | River water | 3 | Oct 2023 – Dec 2023 | below 0.0003 µg/l 7 Dec 2023 |
| Tributyl Tin as Cation 8944 | River water | 2 | Oct 2023 – Dec 2023 | below 0.0002 µg/l 7 Dec 2023 |
| Triclopyr 3555 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 7 Dec 2023 |
| Triphenyl Tin as Cation 5732 | River water | 2 | Oct 2023 – Dec 2023 | below 0.0002 µg/l 7 Dec 2023 |
| Zinc : BLM Bioavailable 4822 | River water | 3 | Oct 2023 – Dec 2023 | 3.7 µg/l 7 Dec 2023 |
| Zinc, Dissolved 3408 | River water | 3 | Oct 2023 – Dec 2023 | 8.7 µg/l 7 Dec 2023 |
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.