Spot Gauge - Mainsforth Stell upstream of Chilton Lane sewage treatment works
EA name: SPOT GAUGE -MAINSF ST U/S CHILTON LN STW (also listed as “SPOT GAUGE - MAINSFORTH STELL U/S CHILTON LANE STW”)
Environment Agency sampling point NE-45300309 · 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
- 30 Apr 2026, 09:215 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
- 21 since 23 Nov 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 430731, 531111As published, to the nearest 1 m. Open in a map
- River, by its own name
- Spot Gauge
- River, by the map
- Not placedIts name gives Spot Gauge; the only line close by, 4 m away, is The Carr Drain and is not traced into it. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Monitoring (national agency policy) (21 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
69.5%
Sampled 30 Apr 2026, 5 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Apr 2026, 09:21 | 69.5 | 69.5% |
| 20 Mar 2026, 10:18 | 75.1 | 75.1% |
| 17 Feb 2026, 14:21 | 88.6 | 88.6% |
| 15 Jan 2026, 12:52 | 77.3 | 77.3% |
| 7 Mar 2025, 10:40 | 74.5 | 74.5% |
| 3 Feb 2025, 08:50 | 80.4 | 80.4% |
| 20 Jan 2025, 09:01 | 85.8 | 85.8% |
| 3 Dec 2024, 11:40 | 82.9 | 82.9% |
| 19 Nov 2024, 13:14 | 75.5 | 75.5% |
| 23 Oct 2024, 10:15 | 72.3 | 72.3% |
| 17 Sep 2024, 11:52 | 80 | 80% |
| 21 Aug 2024, 14:04 | 81.1 | 81.1% |
| 24 Jul 2024, 12:03 | 79.7 | 79.7% |
| 26 Jun 2024, 09:15 | 72 | 72% |
| 13 May 2024, 09:48 | 83.3 | 83.3% |
| 18 Apr 2024, 12:05 | 85.2 | 85.2% |
| 18 Mar 2024, 10:26 | 83.1 | 83.1% |
| 21 Feb 2024, 11:08 | 84.6 | 84.6% |
| 15 Jan 2024, 09:51 | 77.5 | 77.5% |
| 6 Dec 2023, 11:31 | 81.5 | 81.5% |
| 23 Nov 2023, 12:58 | 79.5 | 79.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
7.81 mg/l
Sampled 30 Apr 2026, 5 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Apr 2026, 09:21 | 7.81 | 7.81 mg/l |
| 20 Mar 2026, 10:18 | 8.65 | 8.65 mg/l |
| 17 Feb 2026, 14:21 | 11.1 | 11.1 mg/l |
| 15 Jan 2026, 12:52 | 9.42 | 9.42 mg/l |
| 7 Mar 2025, 10:40 | 8.68 | 8.68 mg/l |
| 3 Feb 2025, 08:50 | 9.77 | 9.77 mg/l |
| 20 Jan 2025, 09:01 | 10.9 | 10.9 mg/l |
| 3 Dec 2024, 11:40 | 10 | 10 mg/l |
| 19 Nov 2024, 13:14 | 9.06 | 9.06 mg/l |
| 23 Oct 2024, 10:15 | 8.24 | 8.24 mg/l |
| 17 Sep 2024, 11:52 | 8.17 | 8.17 mg/l |
| 21 Aug 2024, 14:04 | 8.3 | 8.3 mg/l |
| 24 Jul 2024, 12:03 | 7.91 | 7.91 mg/l |
| 26 Jun 2024, 09:15 | 7.43 | 7.43 mg/l |
| 13 May 2024, 09:48 | 8.86 | 8.86 mg/l |
| 18 Apr 2024, 12:05 | 9.76 | 9.76 mg/l |
| 18 Mar 2024, 10:26 | 9.47 | 9.47 mg/l |
| 21 Feb 2024, 11:08 | 9.93 | 9.93 mg/l |
| 15 Jan 2024, 09:51 | 9.86 | 9.86 mg/l |
| 6 Dec 2023, 11:31 | 10.4 | 10.4 mg/l |
| 23 Nov 2023, 12:58 | 8.77 | 8.77 mg/l |
Water temperature
code 0076 · °C
10.1 °C
Sampled 30 Apr 2026, 5 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Apr 2026, 09:21 | 10.1 | 10.1 °C |
| 20 Mar 2026, 10:18 | 9.1 | 9.1 °C |
| 17 Feb 2026, 14:21 | 5.7 | 5.7 °C |
| 15 Jan 2026, 12:52 | 6.8 | 6.8 °C |
| 7 Mar 2025, 10:40 | 8.6 | 8.6 °C |
| 3 Feb 2025, 08:50 | 6.9 | 6.9 °C |
| 20 Jan 2025, 09:01 | 5.3 | 5.3 °C |
| 3 Dec 2024, 11:40 | 7.1 | 7.1 °C |
| 19 Nov 2024, 13:14 | 7.4 | 7.4 °C |
| 23 Oct 2024, 10:15 | 9.5 | 9.5 °C |
| 17 Sep 2024, 11:52 | 14.3 | 14.3 °C |
| 21 Aug 2024, 14:04 | 14.2 | 14.2 °C |
| 24 Jul 2024, 12:03 | 15.6 | 15.6 °C |
| 26 Jun 2024, 09:15 | 13.8 | 13.8 °C |
| 13 May 2024, 09:48 | 12.5 | 12.5 °C |
| 18 Apr 2024, 12:05 | 9.3 | 9.3 °C |
| 18 Mar 2024, 10:26 | 9.5 | 9.5 °C |
| 21 Feb 2024, 11:08 | 8.3 | 8.3 °C |
| 15 Jan 2024, 09:51 | 5.1 | 5.1 °C |
| 6 Dec 2023, 11:31 | 4.9 | 4.9 °C |
| 23 Nov 2023, 12:58 | 10.9 | 10.9 °C |
pH
code 0061
7.52
Sampled 30 Apr 2026, 5 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Apr 2026, 09:21 | 7.52 | 7.52 |
| 20 Mar 2026, 10:18 | 7.53 | 7.53 |
| 17 Feb 2026, 14:21 | 7.41 | 7.41 |
| 15 Jan 2026, 12:52 | 7.87 | 7.87 |
| 7 Mar 2025, 10:40 | 7.78 | 7.78 |
| 3 Feb 2025, 08:50 | 7.51 | 7.51 |
| 20 Jan 2025, 09:01 | 7.55 | 7.55 |
| 3 Dec 2024, 11:40 | 7.58 | 7.58 |
| 19 Nov 2024, 13:14 | 7.81 | 7.81 |
| 23 Oct 2024, 10:15 | 7.45 | 7.45 |
| 17 Sep 2024, 11:52 | 7.51 | 7.51 |
| 21 Aug 2024, 14:04 | 7.5 | 7.5 |
| 24 Jul 2024, 12:03 | 7.27 | 7.27 |
| 26 Jun 2024, 09:15 | 7.39 | 7.39 |
| 13 May 2024, 09:48 | 7.47 | 7.47 |
| 18 Apr 2024, 12:05 | 7.77 | 7.77 |
| 18 Mar 2024, 10:26 | 7.54 | 7.54 |
| 21 Feb 2024, 11:08 | 7.54 | 7.54 |
| 15 Jan 2024, 09:51 | 7.83 | 7.83 |
| 6 Dec 2023, 11:31 | 7.45 | 7.45 |
| 23 Nov 2023, 12:58 | 7.53 | 7.53 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 30 Apr 2026, 5 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Apr 2026, 09:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Mar 2026, 10:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Feb 2026, 14:21 | 0.071 | 0.071 mg/l |
| 15 Jan 2026, 12:52 | 0.12 | 0.12 mg/l |
| 7 Mar 2025, 10:40 | 0.13 | 0.13 mg/l |
| 3 Feb 2025, 08:50 | 0.098 | 0.098 mg/l |
| 20 Jan 2025, 09:01 | 0.049 | 0.049 mg/l |
| 3 Dec 2024, 11:40 | 0.066 | 0.066 mg/l |
| 19 Nov 2024, 13:14 | 0.12 | 0.12 mg/l |
| 23 Oct 2024, 10:15 | 0.044 | 0.044 mg/l |
| 17 Sep 2024, 11:52 | 0.082 | 0.082 mg/l |
| 21 Aug 2024, 14:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Jul 2024, 12:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Jun 2024, 09:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 May 2024, 09:48 | 0.071 | 0.071 mg/l |
| 18 Apr 2024, 12:05 | 0.035 | 0.035 mg/l |
| 18 Mar 2024, 10:26 | 0.043 | 0.043 mg/l |
| 21 Feb 2024, 11:08 | 0.038 | 0.038 mg/l |
| 15 Jan 2024, 09:51 | 0.042 | 0.042 mg/l |
| 6 Dec 2023, 11:31 | 0.066 | 0.066 mg/l |
| 23 Nov 2023, 12:58 | 0.044 | 0.044 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
6.69 mg/l
Sampled 30 Apr 2026, 5 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Apr 2026, 09:21 | 6.69 | 6.69 mg/l |
| 20 Mar 2026, 10:18 | 6.49 | 6.49 mg/l |
| 17 Feb 2026, 14:21 | 5.49 | 5.49 mg/l |
| 15 Jan 2026, 12:52 | 6.47 | 6.47 mg/l |
| 7 Mar 2025, 10:40 | 6.58 | 6.58 mg/l |
| 3 Feb 2025, 08:50 | 9.98 | 9.98 mg/l |
| 20 Jan 2025, 09:01 | 9.39 | 9.39 mg/l |
| 3 Dec 2024, 11:40 | 8.17 | 8.17 mg/l |
| 19 Nov 2024, 13:14 | 6.97 | 6.97 mg/l |
| 23 Oct 2024, 10:15 | 6.17 | 6.17 mg/l |
| 17 Sep 2024, 11:52 | 9.32 | 9.32 mg/l |
| 21 Aug 2024, 14:04 | 6.37 | 6.37 mg/l |
| 24 Jul 2024, 12:03 | 5.88 | 5.88 mg/l |
| 26 Jun 2024, 09:15 | 6.99 | 6.99 mg/l |
| 13 May 2024, 09:48 | 9.16 | 9.16 mg/l |
| 18 Apr 2024, 12:05 | 6.08 | 6.08 mg/l |
| 18 Mar 2024, 10:26 | 8.19 | 8.19 mg/l |
| 21 Feb 2024, 11:08 | 6.59 | 6.59 mg/l |
| 15 Jan 2024, 09:51 | 7.29 | 7.29 mg/l |
| 6 Dec 2023, 11:31 | 5.28 | 5.28 mg/l |
| 23 Nov 2023, 12:58 | 9.38 | 9.38 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
below 0.01 mg/l (not detected above this)
Sampled 30 Apr 2026, 5 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Apr 2026, 09:21 | <0.01 | below 0.01 mg/l (not detected above this) |
| 20 Mar 2026, 10:18 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Feb 2026, 14:21 | 0.15 | 0.15 mg/l |
| 15 Jan 2026, 12:52 | <0.01 | below 0.01 mg/l (not detected above this) |
| 7 Mar 2025, 10:40 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Feb 2025, 08:50 | 0.042 | 0.042 mg/l |
| 20 Jan 2025, 09:01 | 0.017 | 0.017 mg/l |
| 3 Dec 2024, 11:40 | 0.022 | 0.022 mg/l |
| 19 Nov 2024, 13:14 | 0.03 | 0.03 mg/l |
| 23 Oct 2024, 10:15 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Sep 2024, 11:52 | 0.046 | 0.046 mg/l |
| 21 Aug 2024, 14:04 | <0.01 | below 0.01 mg/l (not detected above this) |
| 24 Jul 2024, 12:03 | <0.01 | below 0.01 mg/l (not detected above this) |
| 26 Jun 2024, 09:15 | <0.01 | below 0.01 mg/l (not detected above this) |
| 13 May 2024, 09:48 | 0.035 | 0.035 mg/l |
| 18 Apr 2024, 12:05 | <0.01 | below 0.01 mg/l (not detected above this) |
| 18 Mar 2024, 10:26 | 0.015 | 0.015 mg/l |
| 21 Feb 2024, 11:08 | 0.016 | 0.016 mg/l |
| 15 Jan 2024, 09:51 | 0.019 | 0.019 mg/l |
| 6 Dec 2023, 11:31 | 0.015 | 0.015 mg/l |
| 23 Nov 2023, 12:58 | 0.025 | 0.025 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
1281 µS/cm
Sampled 30 Apr 2026, 5 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Apr 2026, 09:21 | 1281 | 1281 µS/cm |
| 20 Mar 2026, 10:18 | 1232 | 1232 µS/cm |
| 17 Feb 2026, 14:21 | 1103 | 1103 µS/cm |
| 15 Jan 2026, 12:52 | 1935 | 1935 µS/cm |
| 7 Mar 2025, 10:40 | 1911 | 1911 µS/cm |
| 3 Feb 2025, 08:50 | 1186 | 1186 µS/cm |
| 20 Jan 2025, 09:01 | 1122 | 1122 µS/cm |
| 3 Dec 2024, 11:40 | 1173 | 1173 µS/cm |
| 19 Nov 2024, 13:14 | 1271 | 1271 µS/cm |
| 23 Oct 2024, 10:15 | 1214 | 1214 µS/cm |
| 17 Sep 2024, 11:52 | 1122 | 1122 µS/cm |
| 21 Aug 2024, 14:04 | 1308 | 1308 µS/cm |
| 24 Jul 2024, 12:03 | 1291 | 1291 µS/cm |
| 26 Jun 2024, 09:15 | 1367 | 1367 µS/cm |
| 13 May 2024, 09:48 | 1189 | 1189 µS/cm |
| 18 Apr 2024, 12:05 | 1153 | 1153 µS/cm |
| 18 Mar 2024, 10:26 | 1131 | 1131 µS/cm |
| 21 Feb 2024, 11:08 | 1067 | 1067 µS/cm |
| 15 Jan 2024, 09:51 | 1184 | 1184 µS/cm |
| 6 Dec 2023, 11:31 | 1085 | 1085 µS/cm |
| 23 Nov 2023, 12:58 | 1054 | 1054 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 | 21 | Nov 2023 – Apr 2026 | 69.5% 30 Apr 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 21 | Nov 2023 – Apr 2026 | 7.81 mg/l 30 Apr 2026 |
| Temperature of Water 0076 | River water | 21 | Nov 2023 – Apr 2026 | 10.1 °C 30 Apr 2026 |
| pH 0061 | River water | 21 | Nov 2023 – Apr 2026 | 7.52 30 Apr 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 21 | Nov 2023 – Apr 2026 | below 0.03 mg/l 30 Apr 2026 |
| Nitrate as N 0117 | River water | 21 | Nov 2023 – Apr 2026 | 6.69 mg/l 30 Apr 2026 |
| Orthophosphate, reactive as P 0180 | River water | 21 | Nov 2023 – Apr 2026 | below 0.01 mg/l 30 Apr 2026 |
| Conductivity at 25 C 0077 | River water | 21 | Nov 2023 – Apr 2026 | 1281 µS/cm 30 Apr 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 21 | Nov 2023 – Apr 2026 | 310 mg/l 30 Apr 2026 |
| Ammonia un-ionised as N 0119 | River water | 21 | Nov 2023 – Apr 2026 | below 0.00018 mg/l 30 Apr 2026 |
| BOD : 5 Day ATU 0085 | River water | 14 | Feb 2024 – Mar 2025 | below 3 mg/l 7 Mar 2025 |
| Nitrite as N 0118 | River water | 21 | Nov 2023 – Apr 2026 | 0.0084 mg/l 30 Apr 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 21 | Nov 2023 – Apr 2026 | 6.7 mg/l 30 Apr 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.