Langtree Lake at Priestacott Mill
EA name: LANGTREE LAKE AT PRIESTACOTT MILL (also listed as “RSN0963 LANGTREE LAKE AT PRIESTACOTT MILL”)
Environment Agency sampling point SW-RSN0963 · 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 Dec 2023, 14:132.8 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 30 Sep 2026 and had nothing newer.
- Samples banked
- 3 since 6 Oct 2023 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 246797, 117507As published, to the nearest 1 m. Open in a map
- River, by its own name
- Langtree Lake
- River, by the map
- Langtree LakePlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- Weare Giffard On the River Torridge · 7.5 km along the river
- Why it was sampled
- Monitoring (national agency policy) (3 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
100.1%
Sampled 6 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Dec 2023, 14:13 | 100.1 | 100.1% |
| 7 Nov 2023, 15:02 | 97.7 | 97.7% |
| 6 Oct 2023, 11:22 | 99.4 | 99.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.7 mg/l
Sampled 6 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Dec 2023, 14:13 | 11.7 | 11.7 mg/l |
| 7 Nov 2023, 15:02 | 10.8 | 10.8 mg/l |
| 6 Oct 2023, 11:22 | 10.3 | 10.3 mg/l |
Water temperature
code 0076 · °C
8.4 °C
Sampled 6 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Dec 2023, 14:13 | 8.4 | 8.4 °C |
| 7 Nov 2023, 15:02 | 10.9 | 10.9 °C |
| 6 Oct 2023, 11:22 | 13.8 | 13.8 °C |
pH
code 0061
7.28
Sampled 6 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Dec 2023, 14:13 | 7.28 | 7.28 |
| 7 Nov 2023, 15:02 | 7.67 | 7.67 |
| 6 Oct 2023, 11:22 | 7.56 | 7.56 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 6 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Dec 2023, 14:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Nov 2023, 15:02 | 0.047 | 0.047 mg/l |
| 6 Oct 2023, 11:22 | 0.033 | 0.033 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.48 mg/l
Sampled 6 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Dec 2023, 14:13 | 4.48 | 4.48 mg/l |
| 7 Nov 2023, 15:02 | 4.38 | 4.38 mg/l |
| 6 Oct 2023, 11:22 | 3.68 | 3.68 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.026 mg/l
Sampled 6 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Dec 2023, 14:13 | 0.026 | 0.026 mg/l |
| 7 Nov 2023, 15:02 | 0.037 | 0.037 mg/l |
| 6 Oct 2023, 11:22 | 0.049 | 0.049 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
203 µS/cm
Sampled 6 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Dec 2023, 14:13 | 203 | 203 µS/cm |
| 7 Nov 2023, 15:02 | 166 | 166 µS/cm |
| 6 Oct 2023, 11:22 | 209 | 209 µS/cm |
Everything measured here
110 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 110 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 3 | Oct 2023 – Dec 2023 | 100.1% 6 Dec 2023 |
| Oxygen, Dissolved as O2 9924 | River water | 3 | Oct 2023 – Dec 2023 | 11.7 mg/l 6 Dec 2023 |
| Temperature of Water 0076 | River water | 3 | Oct 2023 – Dec 2023 | 8.4 °C 6 Dec 2023 |
| pH 0061 | River water | 3 | Oct 2023 – Dec 2023 | 7.28 6 Dec 2023 |
| Ammoniacal Nitrogen as N 0111 | River water | 3 | Oct 2023 – Dec 2023 | below 0.03 mg/l 6 Dec 2023 |
| Nitrate as N 0117 | River water | 3 | Oct 2023 – Dec 2023 | 4.48 mg/l 6 Dec 2023 |
| Orthophosphate, reactive as P 0180 | River water | 3 | Oct 2023 – Dec 2023 | 0.026 mg/l 6 Dec 2023 |
| Conductivity at 25 C 0077 | River water | 3 | Oct 2023 – Dec 2023 | 203 µS/cm 6 Dec 2023 |
| 2,3,6-TBA :- {2,3,6-Trichlorobenzoic acid} 7726 | River water | 3 | Oct 2023 – Dec 2023 | below 0.02 µg/l 6 Dec 2023 |
| 2,4,5-T :- {2,4,5-Trichlorophenoxyacetic acid} 3546 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| 2,4-D :- {2,4-Dichlorophenoxyacetic acid} 3545 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| 2,4-DB :- {4-(2,4-dichlorophenoxy)butyric acid} 3791 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| 2-Phenoxypropionic acid :- {PPA} 6673 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| 4-Chloro-2-methylphenol :- {p-Chloro-o-cresol} 3341 | River water | 3 | Oct 2023 – Dec 2023 | below 0.05 µg/l 6 Dec 2023 |
| 4-Chlorophenoxyacetic acid 3547 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| 4-Phenoxybutyric acid :- {PBA} 6672 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Aldicarb 9344 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Aldicarb sulfoxide 8806 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Aldoxycarb :- {Aldicarb Sulfone} 8807 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 3 | Oct 2023 – Dec 2023 | 42 mg/l 6 Dec 2023 |
| Aluminium, Dissolved 6037 | River water | 3 | Oct 2023 – Dec 2023 | 17 µg/l 6 Dec 2023 |
| Ammonia un-ionised as N 0119 | River water | 3 | Oct 2023 – Dec 2023 | below 0.00009 mg/l 6 Dec 2023 |
| Asulam 3004 | River water | 3 | Oct 2023 – Dec 2023 | below 0.02 µg/l 6 Dec 2023 |
| Azoxystrobin 5050 | River water | 3 | Oct 2023 – Dec 2023 | below 0.02 µg/l 6 Dec 2023 |
| Barium, Dissolved 9446 | River water | 3 | Oct 2023 – Dec 2023 | below 10 µg/l 6 Dec 2023 |
| Benazolin 3792 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Bentazone 4065 | River water | 3 | Oct 2023 – Dec 2023 | below 0.003 µg/l 6 Dec 2023 |
| Benzo(a)Pyrene 6399 | River water | 3 | Oct 2023 – Dec 2023 | 0.0032 µg/l 6 Dec 2023 |
| Benzo(b)Fluoranthene 0731 | River water | 3 | Oct 2023 – Dec 2023 | 0.003 µg/l 6 Dec 2023 |
| Benzo(g,h,i)Perylene 0714 | River water | 3 | Oct 2023 – Dec 2023 | 0.0048 µg/l 6 Dec 2023 |
| Benzo(k)Fluoranthene 0733 | River water | 3 | Oct 2023 – Dec 2023 | 0.0015 µg/l 6 Dec 2023 |
| Boron, Dissolved 9447 | River water | 3 | Oct 2023 – Dec 2023 | below 100 µg/l 6 Dec 2023 |
| Bromoxynil 6449 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Cadmium, Dissolved 0106 | River water | 3 | Oct 2023 – Dec 2023 | 0.019 µg/l 6 Dec 2023 |
| Calcium, Dissolved 0239 | River water | 3 | Oct 2023 – Dec 2023 | 18 mg/l 6 Dec 2023 |
| Carbaryl 9343 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Carbendazim 3475 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Carbetamide 9073 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Carbofuran 3086 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 3 | Oct 2023 – Dec 2023 | 3 mg/l 6 Dec 2023 |
| Chloridazon 6760 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Chloride 0172 | River water | 3 | Oct 2023 – Dec 2023 | 19 mg/l 6 Dec 2023 |
| Chlorotoluron 9348 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Chloroxuron 3399 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Chromium, Dissolved 3409 | River water | 3 | Oct 2023 – Dec 2023 | below 0.5 µg/l 6 Dec 2023 |
| cis-Permethrin 9341 | River water | 2 | Oct 2023 – Dec 2023 | below 0.0001 µg/l 6 Dec 2023 |
| Clopyralid 6620 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Copper : BLM Bioavailable 4821 | River water | 3 | Oct 2023 – Dec 2023 | 0.11 µg/l 6 Dec 2023 |
| Copper, Dissolved 6450 | River water | 3 | Oct 2023 – Dec 2023 | 1.3 µg/l 6 Dec 2023 |
| Cypermethrin 0073 | River water | 3 | Oct 2023 – Dec 2023 | below 0.00001 µg/l 6 Dec 2023 |
| Cypermethrin Identification 5446 | River water | 3 | Oct 2023 – Dec 2023 | 1 text result 6 Dec 2023 |
| Dicamba 3550 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Dichlorprop :- {2,4-DP} 3551 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Diflurobenzuron 9345 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Diuron 3811 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Ethiofencarb 6955 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Ethirimol 5047 | River water | 3 | Oct 2023 – Dec 2023 | below 0.05 µg/l 6 Dec 2023 |
| Fenoprop 3552 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Fenuron 9339 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Fluoranthene 0736 | River water | 3 | Oct 2023 – Dec 2023 | 0.0036 µg/l 6 Dec 2023 |
| Fluroxypyr 4064 | River water | 3 | Oct 2023 – Dec 2023 | 0.0053 µg/l 6 Dec 2023 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 3 | Oct 2023 – Dec 2023 | 1 text result 6 Dec 2023 |
| Hardness, Calcium 0163 | River water | 3 | Oct 2023 – Dec 2023 | 44.9 mg/l 6 Dec 2023 |
| Hardness, Total as CaCO3 0158 | River water | 3 | Oct 2023 – Dec 2023 | 63.5 mg/l 6 Dec 2023 |
| Imazapyr 7025 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Indeno(1,2,3-cd)pyrene 0746 | River water | 3 | Oct 2023 – Dec 2023 | 0.0053 µg/l 6 Dec 2023 |
| Ioxynil 9068 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Iron, Dissolved 6460 | River water | 3 | Oct 2023 – Dec 2023 | 100 µg/l 6 Dec 2023 |
| Isoproturon 3117 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Lead : BLM Bioavailable 3377 | River water | 3 | Oct 2023 – Dec 2023 | 0.02 µg/l 6 Dec 2023 |
| Lead, Dissolved 0052 | River water | 3 | Oct 2023 – Dec 2023 | below 0.1 µg/l 6 Dec 2023 |
| Linuron 3118 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Lithium, Dissolved 4201 | River water | 3 | Oct 2023 – Dec 2023 | below 100 µg/l 6 Dec 2023 |
| Magnesium, Dissolved 0235 | River water | 3 | Oct 2023 – Dec 2023 | 4.5 mg/l 6 Dec 2023 |
| Manganese : BLM Bioavailable 4820 | River water | 3 | Oct 2023 – Dec 2023 | 8.8 µg/l 6 Dec 2023 |
| Manganese, Dissolved 6458 | River water | 3 | Oct 2023 – Dec 2023 | 19 µg/l 6 Dec 2023 |
| MCPA :- {4-Chloro-2-methylphenoxyacetic acid} 3548 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| MCPB :- {4-Chloro-2-methylphenoxybutyric acid} 3790 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Mecoprop 3549 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Methabenzthiazuron 7053 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Methiocarb 6971 | River water | 3 | Oct 2023 – Dec 2023 | below 0.001 µg/l 6 Dec 2023 |
| Methomyl 6972 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Metoxuron 3130 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Metsulfuron-methyl 9861 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Monolinuron 3925 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Monuron 3400 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Neburon 9756 | River water | 3 | Oct 2023 – Dec 2023 | below 0.01 µg/l 6 Dec 2023 |
| Nickel : BLM Bioavailable 3878 | River water | 3 | Oct 2023 – Dec 2023 | 0.51 µg/l 6 Dec 2023 |
| Nickel, Dissolved 3410 | River water | 3 | Oct 2023 – Dec 2023 | 0.99 µg/l 6 Dec 2023 |
| Nitrite as N 0118 | River water | 3 | Oct 2023 – Dec 2023 | 0.017 mg/l 6 Dec 2023 |
| Nitrogen, Total Oxidised as N 0116 | River water | 3 | Oct 2023 – Dec 2023 | 4.5 mg/l 6 Dec 2023 |
| Oxamyl 6980 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Perfluorooctanoate anion 9274 | River water | 3 | Oct 2023 – Dec 2023 | below 0.0006 µg/l 6 Dec 2023 |
| Perfluorooctylsulphonate anion 9276 | River water | 3 | Oct 2023 – Dec 2023 | 0.00012 µg/l 6 Dec 2023 |
| Phenoxyacetic acid :- {PAA} 6671 | River water | 2 | Oct 2023 – Nov 2023 | 0.015 µg/l 7 Nov 2023 |
| Phosphorus, Total as P 0348 | River water | 3 | Oct 2023 – Dec 2023 | 0.055 mg/l 6 Dec 2023 |
| Picloram 9883 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Potassium, Dissolved 0209 | River water | 3 | Oct 2023 – Dec 2023 | 3 mg/l 6 Dec 2023 |
| Propoxur 6987 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Silica, reactive as SiO2 0182 | River water | 3 | Oct 2023 – Dec 2023 | 6 mg/l 6 Dec 2023 |
| Sodium, Dissolved 0205 | River water | 3 | Oct 2023 – Dec 2023 | 12 mg/l 6 Dec 2023 |
| Strontium, Filtered 6693 | River water | 3 | Oct 2023 – Dec 2023 | 49 µg/l 6 Dec 2023 |
| Sulcotrione 5042 | River water | 3 | Oct 2023 – Dec 2023 | below 0.1 µg/l 6 Dec 2023 |
| Sulphate, Dissolved as SO4 7859 | River water | 3 | Oct 2023 – Dec 2023 | below 10 mg/l 6 Dec 2023 |
| trans-Permethrin 9342 | River water | 3 | Oct 2023 – Dec 2023 | below 0.0001 µg/l 6 Dec 2023 |
| Tributyl Tin as Cation 8944 | River water | 3 | Oct 2023 – Dec 2023 | below 0.0002 µg/l 6 Dec 2023 |
| Triclopyr 3555 | River water | 3 | Oct 2023 – Dec 2023 | below 0.005 µg/l 6 Dec 2023 |
| Triphenyl Tin as Cation 5732 | River water | 3 | Oct 2023 – Dec 2023 | below 0.0002 µg/l 6 Dec 2023 |
| Zinc : BLM Bioavailable 4822 | River water | 3 | Oct 2023 – Dec 2023 | 1.3 µg/l 6 Dec 2023 |
| Zinc, Dissolved 3408 | River water | 3 | Oct 2023 – Dec 2023 | 2.3 µg/l 6 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.