Chilt upstream of Stor confluence
EA name: CHILT U/S STOR CONF (also listed as “ARUN CHILT UPSTREAM STOR CONFLUENCE”)
Environment Agency sampling point SO-F0002874 · 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
- 10 Aug 2026, 13:3252 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 27 since 18 Jun 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 506600, 117900As published, to the nearest 100 m (so up to about 70 m out). Open in a map
- River, by its own name
- Chilt
- River, by the map
- River ChiltPlaced on the river its name gives, 7 m from the line.
- Next gauge downstream
- Houghton Bridge On the River Arun · 13 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (15 samples)
Monitoring (national agency policy) (12 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
87.5%
Sampled 10 Aug 2026, 52 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 13:32 | 87.5 | 87.5% |
| 10 Jul 2026, 12:53 | 90 | 90% |
| 5 Jun 2026, 11:05 | 93.1 | 93.1% |
| 11 May 2026, 13:06 | 104.5 | 104.5% |
| 17 Apr 2026, 14:43 | 91.6 | 91.6% |
| 2 Mar 2026, 11:43 | 100 | 100% |
| 4 Feb 2026, 13:17 | 97.1 | 97.1% |
| 9 Jan 2026, 11:31 | 87.5 | 87.5% |
| 1 Dec 2025, 12:10 | 77.6 | 77.6% |
| 7 Nov 2025, 15:06 | 70.6 | 70.6% |
| 9 Oct 2025, 12:12 | 79.7 | 79.7% |
| 5 Sep 2025, 11:15 | 79.6 | 79.6% |
| 6 Aug 2025, 12:08 | 99.4 | 99.4% |
| 10 Jul 2025, 11:23 | 92 | 92% |
| 12 Jun 2025, 09:59 | 91.3 | 91.3% |
| 6 May 2025, 15:37 | 113 | 113% |
| 10 Apr 2025, 12:14 | 117.8 | 117.8% |
| 18 Mar 2025, 12:29 | 98.6 | 98.6% |
| 3 Feb 2025, 14:11 | 92.7 | 92.7% |
| 20 Jan 2025, 10:19 | 90 | 90% |
| 6 Dec 2024, 11:05 | 84.8 | 84.8% |
| 20 Nov 2024, 11:30 | 81.7 | 81.7% |
| 22 Oct 2024, 13:34 | 77.3 | 77.3% |
| 27 Sep 2024, 10:58 | 75.7 | 75.7% |
| 17 Sep 2024, 11:24 | 89.3 | 89.3% |
| 16 Jul 2024, 16:30 | 63.6 | 63.6% |
| 18 Jun 2024, 11:35 | 82.3 | 82.3% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.38 mg/l
Sampled 10 Aug 2026, 52 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 13:32 | 8.38 | 8.38 mg/l |
| 10 Jul 2026, 12:53 | 8.04 | 8.04 mg/l |
| 5 Jun 2026, 11:05 | 9.45 | 9.45 mg/l |
| 11 May 2026, 13:06 | 11.6 | 11.6 mg/l |
| 17 Apr 2026, 14:43 | 9.19 | 9.19 mg/l |
| 2 Mar 2026, 11:43 | 11.2 | 11.2 mg/l |
| 4 Feb 2026, 13:17 | 11.4 | 11.4 mg/l |
| 9 Jan 2026, 11:31 | 11.2 | 11.2 mg/l |
| 1 Dec 2025, 12:10 | 8.89 | 8.89 mg/l |
| 7 Nov 2025, 15:06 | 7.34 | 7.34 mg/l |
| 9 Oct 2025, 12:12 | 8.45 | 8.45 mg/l |
| 5 Sep 2025, 11:15 | 8.18 | 8.18 mg/l |
| 6 Aug 2025, 12:08 | 9.91 | 9.91 mg/l |
| 10 Jul 2025, 11:23 | 8.83 | 8.83 mg/l |
| 12 Jun 2025, 09:59 | 8.99 | 8.99 mg/l |
| 6 May 2025, 15:37 | 12.1 | 12.1 mg/l |
| 10 Apr 2025, 12:14 | 13.3 | 13.3 mg/l |
| 18 Mar 2025, 12:29 | 11.4 | 11.4 mg/l |
| 3 Feb 2025, 14:11 | 11.2 | 11.2 mg/l |
| 20 Jan 2025, 10:19 | 11.3 | 11.3 mg/l |
| 6 Dec 2024, 11:05 | 9.88 | 9.88 mg/l |
| 20 Nov 2024, 11:30 | 9.88 | 9.88 mg/l |
| 22 Oct 2024, 13:34 | 8.39 | 8.39 mg/l |
| 27 Sep 2024, 10:58 | 7.96 | 7.96 mg/l |
| 17 Sep 2024, 11:24 | 9.37 | 9.37 mg/l |
| 16 Jul 2024, 16:30 | 6.2 | 6.2 mg/l |
| 18 Jun 2024, 11:35 | 8.48 | 8.48 mg/l |
Water temperature
code 0076 · °C
17.3 °C
Sampled 10 Aug 2026, 52 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 13:32 | 17.3 | 17.3 °C |
| 10 Jul 2026, 12:53 | 20.8 | 20.8 °C |
| 5 Jun 2026, 11:05 | 14.6 | 14.6 °C |
| 11 May 2026, 13:06 | 10.8 | 10.8 °C |
| 17 Apr 2026, 14:43 | 15.1 | 15.1 °C |
| 2 Mar 2026, 11:43 | 10.3 | 10.3 °C |
| 4 Feb 2026, 13:17 | 8.2 | 8.2 °C |
| 9 Jan 2026, 11:31 | 4.8 | 4.8 °C |
| 1 Dec 2025, 12:10 | 9.3 | 9.3 °C |
| 7 Nov 2025, 15:06 | 13.5 | 13.5 °C |
| 9 Oct 2025, 12:12 | 12.6 | 12.6 °C |
| 5 Sep 2025, 11:15 | 14 | 14 °C |
| 6 Aug 2025, 12:08 | 15.4 | 15.4 °C |
| 10 Jul 2025, 11:23 | 17.2 | 17.2 °C |
| 12 Jun 2025, 09:59 | 16 | 16 °C |
| 6 May 2025, 15:37 | 12.2 | 12.2 °C |
| 10 Apr 2025, 12:14 | 9.9 | 9.9 °C |
| 18 Mar 2025, 12:29 | 9.1 | 9.1 °C |
| 3 Feb 2025, 14:11 | 7.2 | 7.2 °C |
| 20 Jan 2025, 10:19 | 5.5 | 5.5 °C |
| 6 Dec 2024, 11:05 | 8.6 | 8.6 °C |
| 20 Nov 2024, 11:30 | 7.1 | 7.1 °C |
| 22 Oct 2024, 13:34 | 11.6 | 11.6 °C |
| 27 Sep 2024, 10:58 | 13 | 13 °C |
| 17 Sep 2024, 11:24 | 13.1 | 13.1 °C |
| 16 Jul 2024, 16:30 | 16.5 | 16.5 °C |
| 18 Jun 2024, 11:35 | 13.9 | 13.9 °C |
pH
code 0061
8.01
Sampled 10 Aug 2026, 52 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 13:32 | 8.01 | 8.01 |
| 10 Jul 2026, 12:53 | 8.12 | 8.12 |
| 5 Jun 2026, 11:05 | 7.91 | 7.91 |
| 11 May 2026, 13:06 | 8.24 | 8.24 |
| 17 Apr 2026, 14:43 | 7.66 | 7.66 |
| 2 Mar 2026, 11:43 | 8.04 | 8.04 |
| 4 Feb 2026, 13:17 | 7.89 | 7.89 |
| 9 Jan 2026, 11:31 | 7.46 | 7.46 |
| 1 Dec 2025, 12:10 | 7.41 | 7.41 |
| 7 Nov 2025, 15:06 | 7.21 | 7.21 |
| 9 Oct 2025, 12:12 | 7.69 | 7.69 |
| 5 Sep 2025, 11:15 | 7.59 | 7.59 |
| 6 Aug 2025, 12:08 | 8.26 | 8.26 |
| 10 Jul 2025, 11:23 | 8.03 | 8.03 |
| 12 Jun 2025, 09:59 | 8.15 | 8.15 |
| 6 May 2025, 15:37 | 8.32 | 8.32 |
| 10 Apr 2025, 12:14 | 8.42 | 8.42 |
| 18 Mar 2025, 12:29 | 7.79 | 7.79 |
| 3 Feb 2025, 14:11 | 7.75 | 7.75 |
| 20 Jan 2025, 10:19 | 7.71 | 7.71 |
| 6 Dec 2024, 11:05 | 7.51 | 7.51 |
| 20 Nov 2024, 11:30 | 7.61 | 7.61 |
| 22 Oct 2024, 13:34 | 7.39 | 7.39 |
| 27 Sep 2024, 10:58 | 7.45 | 7.45 |
| 17 Sep 2024, 11:24 | 8.01 | 8.01 |
| 16 Jul 2024, 16:30 | 7.27 | 7.27 |
| 18 Jun 2024, 11:35 | 7.67 | 7.67 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 10 Aug 2026, 52 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 13:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jul 2026, 12:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Jun 2026, 11:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 May 2026, 13:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Apr 2026, 14:43 | 0.037 | 0.037 mg/l |
| 2 Mar 2026, 11:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2026, 13:17 | 0.35 | 0.35 mg/l |
| 9 Jan 2026, 11:31 | 0.18 | 0.18 mg/l |
| 1 Dec 2025, 12:10 | 0.11 | 0.11 mg/l |
| 7 Nov 2025, 15:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Oct 2025, 12:12 | 0.031 | 0.031 mg/l |
| 5 Sep 2025, 11:15 | 0.054 | 0.054 mg/l |
| 6 Aug 2025, 12:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jul 2025, 11:23 | 0.031 | 0.031 mg/l |
| 12 Jun 2025, 09:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 May 2025, 15:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Apr 2025, 12:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Mar 2025, 12:29 | 0.058 | 0.058 mg/l |
| 3 Feb 2025, 14:11 | 0.074 | 0.074 mg/l |
| 20 Jan 2025, 10:19 | 0.11 | 0.11 mg/l |
| 20 Nov 2024, 11:30 | 0.12 | 0.12 mg/l |
| 22 Oct 2024, 13:34 | 0.065 | 0.065 mg/l |
| 27 Sep 2024, 10:58 | 0.039 | 0.039 mg/l |
| 17 Sep 2024, 11:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jul 2024, 16:30 | 0.072 | 0.072 mg/l |
| 18 Jun 2024, 11:35 | 0.067 | 0.067 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.616 mg/l
Sampled 10 Aug 2026, 52 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 13:32 | 0.616 | 0.616 mg/l |
| 10 Jul 2026, 12:53 | 6.09 | 6.09 mg/l |
| 5 Jun 2026, 11:05 | 3.38 | 3.38 mg/l |
| 11 May 2026, 13:06 | 6.08 | 6.08 mg/l |
| 17 Apr 2026, 14:43 | 0.963 | 0.963 mg/l |
| 2 Mar 2026, 11:43 | 3.89 | 3.89 mg/l |
| 4 Feb 2026, 13:17 | 2.97 | 2.97 mg/l |
| 9 Jan 2026, 11:31 | 1.49 | 1.49 mg/l |
| 1 Dec 2025, 12:10 | 0.725 | 0.725 mg/l |
| 7 Nov 2025, 15:06 | 0.621 | 0.621 mg/l |
| 9 Oct 2025, 12:12 | 0.446 | 0.446 mg/l |
| 5 Sep 2025, 11:15 | 0.613 | 0.613 mg/l |
| 6 Aug 2025, 12:08 | 12 | 12 mg/l |
| 10 Jul 2025, 11:23 | 0.701 | 0.701 mg/l |
| 12 Jun 2025, 09:59 | 4.18 | 4.18 mg/l |
| 6 May 2025, 15:37 | 8.34 | 8.34 mg/l |
| 10 Apr 2025, 12:14 | 3.48 | 3.48 mg/l |
| 18 Mar 2025, 12:29 | 1.1 | 1.1 mg/l |
| 3 Feb 2025, 14:11 | 1.29 | 1.29 mg/l |
| 20 Jan 2025, 10:19 | 1.19 | 1.19 mg/l |
| 20 Nov 2024, 11:30 | 0.838 | 0.838 mg/l |
| 22 Oct 2024, 13:34 | 0.71 | 0.71 mg/l |
| 27 Sep 2024, 10:58 | 0.575 | 0.575 mg/l |
| 17 Sep 2024, 11:24 | 9.06 | 9.06 mg/l |
| 16 Jul 2024, 16:30 | 0.501 | 0.501 mg/l |
| 18 Jun 2024, 11:35 | 1.08 | 1.08 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.038 mg/l
Sampled 10 Aug 2026, 52 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 13:32 | 0.038 | 0.038 mg/l |
| 10 Jul 2026, 12:53 | 0.099 | 0.099 mg/l |
| 5 Jun 2026, 11:05 | 0.081 | 0.081 mg/l |
| 11 May 2026, 13:06 | 0.063 | 0.063 mg/l |
| 17 Apr 2026, 14:43 | 0.04 | 0.04 mg/l |
| 2 Mar 2026, 11:43 | 0.042 | 0.042 mg/l |
| 4 Feb 2026, 13:17 | 0.099 | 0.099 mg/l |
| 9 Jan 2026, 11:31 | 0.069 | 0.069 mg/l |
| 1 Dec 2025, 12:10 | 0.044 | 0.044 mg/l |
| 7 Nov 2025, 15:06 | 0.059 | 0.059 mg/l |
| 9 Oct 2025, 12:12 | 0.02 | 0.02 mg/l |
| 5 Sep 2025, 11:15 | 0.04 | 0.04 mg/l |
| 6 Aug 2025, 12:08 | 0.099 | 0.099 mg/l |
| 10 Jul 2025, 11:23 | 0.046 | 0.046 mg/l |
| 12 Jun 2025, 09:59 | 0.12 | 0.12 mg/l |
| 6 May 2025, 15:37 | 0.26 | 0.26 mg/l |
| 10 Apr 2025, 12:14 | 0.071 | 0.071 mg/l |
| 18 Mar 2025, 12:29 | 0.032 | 0.032 mg/l |
| 3 Feb 2025, 14:11 | 0.039 | 0.039 mg/l |
| 20 Jan 2025, 10:19 | 0.035 | 0.035 mg/l |
| 20 Nov 2024, 11:30 | 0.057 | 0.057 mg/l |
| 22 Oct 2024, 13:34 | 0.056 | 0.056 mg/l |
| 27 Sep 2024, 10:58 | 0.044 | 0.044 mg/l |
| 17 Sep 2024, 11:24 | 1.4 | 1.4 mg/l |
| 16 Jul 2024, 16:30 | 0.081 | 0.081 mg/l |
| 18 Jun 2024, 11:35 | 0.049 | 0.049 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
606 µS/cm
Sampled 10 Aug 2026, 52 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 13:32 | 606 | 606 µS/cm |
| 10 Jul 2026, 12:53 | 632 | 632 µS/cm |
| 5 Jun 2026, 11:05 | 491 | 491 µS/cm |
| 11 May 2026, 13:06 | 587 | 587 µS/cm |
| 17 Apr 2026, 14:43 | 529 | 529 µS/cm |
| 2 Mar 2026, 11:43 | 488 | 488 µS/cm |
| 4 Feb 2026, 13:17 | 416 | 416 µS/cm |
| 9 Jan 2026, 11:31 | 371 | 371 µS/cm |
| 1 Dec 2025, 12:10 | 487 | 487 µS/cm |
| 7 Nov 2025, 15:06 | 485 | 485 µS/cm |
| 9 Oct 2025, 12:12 | 686 | 686 µS/cm |
| 5 Sep 2025, 11:15 | 527 | 527 µS/cm |
| 6 Aug 2025, 12:08 | 679 | 679 µS/cm |
| 10 Jul 2025, 11:23 | 666 | 666 µS/cm |
| 12 Jun 2025, 09:59 | 524 | 524 µS/cm |
| 6 May 2025, 15:37 | 599 | 599 µS/cm |
| 10 Apr 2025, 12:14 | 514 | 514 µS/cm |
| 18 Mar 2025, 12:29 | 528 | 528 µS/cm |
| 3 Feb 2025, 14:11 | 505 | 505 µS/cm |
| 20 Jan 2025, 10:19 | 535 | 535 µS/cm |
| 6 Dec 2024, 11:05 | 424 | 424 µS/cm |
| 20 Nov 2024, 11:30 | 492 | 492 µS/cm |
| 22 Oct 2024, 13:34 | 450 | 450 µS/cm |
| 27 Sep 2024, 10:58 | 396 | 396 µS/cm |
| 17 Sep 2024, 11:24 | 632 | 632 µS/cm |
| 16 Jul 2024, 16:30 | 397 | 397 µS/cm |
| 18 Jun 2024, 11:35 | 558 | 558 µS/cm |
Everything measured here
13 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 13 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 27 | Jun 2024 – Aug 2026 | 87.5% 10 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 27 | Jun 2024 – Aug 2026 | 8.38 mg/l 10 Aug 2026 |
| Temperature of Water 0076 | River water | 27 | Jun 2024 – Aug 2026 | 17.3 °C 10 Aug 2026 |
| pH 0061 | River water | 27 | Jun 2024 – Aug 2026 | 8.01 10 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 26 | Jun 2024 – Aug 2026 | below 0.03 mg/l 10 Aug 2026 |
| Nitrate as N 0117 | River water | 26 | Jun 2024 – Aug 2026 | 0.616 mg/l 10 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 26 | Jun 2024 – Aug 2026 | 0.038 mg/l 10 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 27 | Jun 2024 – Aug 2026 | 606 µS/cm 10 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 26 | Jun 2024 – Aug 2026 | 230 mg/l 10 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 26 | Jun 2024 – Aug 2026 | below 0.00093 mg/l 10 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 23 | Jun 2024 – May 2026 | 2 mg/l 11 May 2026 |
| Nitrite as N 0118 | River water | 26 | Jun 2024 – Aug 2026 | below 0.004 mg/l 10 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 26 | Jun 2024 – Aug 2026 | 0.62 mg/l 10 Aug 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.