Fiddington Brook upstream of Nether Stowey sewage treatment works

EA name: FIDDINGTON BROOK U/S NETHER STOWEY STW (also listed as “FIDD BR ABV N ST STW”)
Environment Agency sampling point SW-60010754 · 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 May 2026, 14:045 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
23 since 20 Jun 2024 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 321178, 140181As published, to the nearest 1 m. Open in a map
River, by its own name
Fiddington Brook
River, by the map
An unnamed streamPlaced by position alone (the only river line close by), 2 m from the line.
Next gauge downstream
None tracedIts water reaches the sea without passing a gauge.
Why it was sampled
Monitoring (national agency policy) (23 samples)

Main measurements, river water

Dissolved oxygen

% saturation · code 9901 · %

95.5%

Sampled 7 May 2026, 5 months ago · 23 results banked

9095100105110%20242025202620 Jun 2024, 11:24: 96.3%25 Jul 2024, 13:02: 95.2%27 Aug 2024, 16:38: 95.6%16 Sep 2024, 12:07: 96.2%14 Oct 2024, 09:35: 93.2%28 Nov 2024, 13:05: 97.4%5 Dec 2024, 13:08: 94%24 Jan 2025, 13:36: 92.6%13 Feb 2025, 11:50: 93.8%13 Mar 2025, 12:08: 97.6%25 Apr 2025, 15:34: 101.1%16 Jun 2025, 14:08: 96.6%16 Jul 2025, 12:59: 95.7%1 Aug 2025, 11:34: 95.9%4 Sep 2025, 15:09: 94.1%14 Oct 2025, 11:39: 93.6%6 Nov 2025, 13:59: 90.8%2 Dec 2025, 10:00: 95.2%12 Jan 2026, 12:03: 96.5%4 Feb 2026, 10:37: 96.5%1 Apr 2026, 14:23: 106.6%21 Apr 2026, 11:16: 105.5%7 May 2026, 14:04: 95.5%
Every result (23)
SampledResult as publishedReads as
7 May 2026, 14:0495.5 95.5%
21 Apr 2026, 11:16105.5 105.5%
1 Apr 2026, 14:23106.6 106.6%
4 Feb 2026, 10:3796.5 96.5%
12 Jan 2026, 12:0396.5 96.5%
2 Dec 2025, 10:0095.2 95.2%
6 Nov 2025, 13:5990.8 90.8%
14 Oct 2025, 11:3993.6 93.6%
4 Sep 2025, 15:0994.1 94.1%
1 Aug 2025, 11:3495.9 95.9%
16 Jul 2025, 12:5995.7 95.7%
16 Jun 2025, 14:0896.6 96.6%
25 Apr 2025, 15:34101.1 101.1%
13 Mar 2025, 12:0897.6 97.6%
13 Feb 2025, 11:5093.8 93.8%
24 Jan 2025, 13:3692.6 92.6%
5 Dec 2024, 13:0894 94%
28 Nov 2024, 13:0597.4 97.4%
14 Oct 2024, 09:3593.2 93.2%
16 Sep 2024, 12:0796.2 96.2%
27 Aug 2024, 16:3895.6 95.6%
25 Jul 2024, 13:0295.2 95.2%
20 Jun 2024, 11:2496.3 96.3%

Dissolved oxygen

as O2 · code 9924 · mg/l

10 mg/l

Sampled 7 May 2026, 5 months ago · 23 results banked

9101112mg/l20242025202620 Jun 2024, 11:24: 9.54 mg/l25 Jul 2024, 13:02: 9.31 mg/l27 Aug 2024, 16:38: 9.23 mg/l16 Sep 2024, 12:07: 9.74 mg/l14 Oct 2024, 09:35: 10.1 mg/l28 Nov 2024, 13:05: 11.2 mg/l5 Dec 2024, 13:08: 10.2 mg/l24 Jan 2025, 13:36: 10.9 mg/l13 Feb 2025, 11:50: 11.3 mg/l13 Mar 2025, 12:08: 11.5 mg/l25 Apr 2025, 15:34: 10.3 mg/l16 Jun 2025, 14:08: 9.31 mg/l16 Jul 2025, 12:59: 9.11 mg/l1 Aug 2025, 11:34: 9.42 mg/l4 Sep 2025, 15:09: 9.28 mg/l14 Oct 2025, 11:39: 9.93 mg/l6 Nov 2025, 13:59: 9.42 mg/l2 Dec 2025, 10:00: 11 mg/l12 Jan 2026, 12:03: 11.1 mg/l4 Feb 2026, 10:37: 11.4 mg/l1 Apr 2026, 14:23: 11.5 mg/l21 Apr 2026, 11:16: 11.7 mg/l7 May 2026, 14:04: 10 mg/l
Every result (23)
SampledResult as publishedReads as
7 May 2026, 14:0410 10 mg/l
21 Apr 2026, 11:1611.7 11.7 mg/l
1 Apr 2026, 14:2311.5 11.5 mg/l
4 Feb 2026, 10:3711.4 11.4 mg/l
12 Jan 2026, 12:0311.1 11.1 mg/l
2 Dec 2025, 10:0011 11 mg/l
6 Nov 2025, 13:599.42 9.42 mg/l
14 Oct 2025, 11:399.93 9.93 mg/l
4 Sep 2025, 15:099.28 9.28 mg/l
1 Aug 2025, 11:349.42 9.42 mg/l
16 Jul 2025, 12:599.11 9.11 mg/l
16 Jun 2025, 14:089.31 9.31 mg/l
25 Apr 2025, 15:3410.3 10.3 mg/l
13 Mar 2025, 12:0811.5 11.5 mg/l
13 Feb 2025, 11:5011.3 11.3 mg/l
24 Jan 2025, 13:3610.9 10.9 mg/l
5 Dec 2024, 13:0810.2 10.2 mg/l
28 Nov 2024, 13:0511.2 11.2 mg/l
14 Oct 2024, 09:3510.1 10.1 mg/l
16 Sep 2024, 12:079.74 9.74 mg/l
27 Aug 2024, 16:389.23 9.23 mg/l
25 Jul 2024, 13:029.31 9.31 mg/l
20 Jun 2024, 11:249.54 9.54 mg/l

Water temperature

code 0076 · °C

13 °C

Sampled 7 May 2026, 5 months ago · 23 results banked

5101520°C20242025202620 Jun 2024, 11:24: 15.7 °C25 Jul 2024, 13:02: 16.3 °C27 Aug 2024, 16:38: 16.9 °C16 Sep 2024, 12:07: 14.7 °C14 Oct 2024, 09:35: 11.5 °C28 Nov 2024, 13:05: 9.2 °C5 Dec 2024, 13:08: 11.5 °C24 Jan 2025, 13:36: 8.3 °C13 Feb 2025, 11:50: 7.1 °C13 Mar 2025, 12:08: 8.3 °C25 Apr 2025, 15:34: 14.3 °C16 Jun 2025, 14:08: 17 °C16 Jul 2025, 12:59: 17.6 °C1 Aug 2025, 11:34: 16.1 °C4 Sep 2025, 15:09: 15.9 °C14 Oct 2025, 11:39: 12.6 °C6 Nov 2025, 13:59: 13.6 °C2 Dec 2025, 10:00: 9 °C12 Jan 2026, 12:03: 9 °C4 Feb 2026, 10:37: 8 °C1 Apr 2026, 14:23: 11.7 °C21 Apr 2026, 11:16: 10.8 °C7 May 2026, 14:04: 13 °C
Every result (23)
SampledResult as publishedReads as
7 May 2026, 14:0413 13 °C
21 Apr 2026, 11:1610.8 10.8 °C
1 Apr 2026, 14:2311.7 11.7 °C
4 Feb 2026, 10:378 8 °C
12 Jan 2026, 12:039 9 °C
2 Dec 2025, 10:009 9 °C
6 Nov 2025, 13:5913.6 13.6 °C
14 Oct 2025, 11:3912.6 12.6 °C
4 Sep 2025, 15:0915.9 15.9 °C
1 Aug 2025, 11:3416.1 16.1 °C
16 Jul 2025, 12:5917.6 17.6 °C
16 Jun 2025, 14:0817 17 °C
25 Apr 2025, 15:3414.3 14.3 °C
13 Mar 2025, 12:088.3 8.3 °C
13 Feb 2025, 11:507.1 7.1 °C
24 Jan 2025, 13:368.3 8.3 °C
5 Dec 2024, 13:0811.5 11.5 °C
28 Nov 2024, 13:059.2 9.2 °C
14 Oct 2024, 09:3511.5 11.5 °C
16 Sep 2024, 12:0714.7 14.7 °C
27 Aug 2024, 16:3816.9 16.9 °C
25 Jul 2024, 13:0216.3 16.3 °C
20 Jun 2024, 11:2415.7 15.7 °C

pH

code 0061

8.16

Sampled 7 May 2026, 5 months ago · 23 results banked

7.67.888.28.420242025202620 Jun 2024, 11:24: 8.225 Jul 2024, 13:02: 8.0527 Aug 2024, 16:38: 8.2316 Sep 2024, 12:07: 8.0914 Oct 2024, 09:35: 7.7628 Nov 2024, 13:05: 7.875 Dec 2024, 13:08: 8.3924 Jan 2025, 13:36: 7.8813 Feb 2025, 11:50: 8.1113 Mar 2025, 12:08: 8.2725 Apr 2025, 15:34: 8.1216 Jun 2025, 14:08: 8.2416 Jul 2025, 12:59: 8.151 Aug 2025, 11:34: 8.274 Sep 2025, 15:09: 8.1114 Oct 2025, 11:39: 8.056 Nov 2025, 13:59: 8.032 Dec 2025, 10:00: 7.7912 Jan 2026, 12:03: 7.944 Feb 2026, 10:37: 7.681 Apr 2026, 14:23: 8.421 Apr 2026, 11:16: 8.287 May 2026, 14:04: 8.16
Every result (23)
SampledResult as publishedReads as
7 May 2026, 14:048.16 8.16
21 Apr 2026, 11:168.28 8.28
1 Apr 2026, 14:238.4 8.4
4 Feb 2026, 10:377.68 7.68
12 Jan 2026, 12:037.94 7.94
2 Dec 2025, 10:007.79 7.79
6 Nov 2025, 13:598.03 8.03
14 Oct 2025, 11:398.05 8.05
4 Sep 2025, 15:098.11 8.11
1 Aug 2025, 11:348.27 8.27
16 Jul 2025, 12:598.15 8.15
16 Jun 2025, 14:088.24 8.24
25 Apr 2025, 15:348.12 8.12
13 Mar 2025, 12:088.27 8.27
13 Feb 2025, 11:508.11 8.11
24 Jan 2025, 13:367.88 7.88
5 Dec 2024, 13:088.39 8.39
28 Nov 2024, 13:057.87 7.87
14 Oct 2024, 09:357.76 7.76
16 Sep 2024, 12:078.09 8.09
27 Aug 2024, 16:388.23 8.23
25 Jul 2024, 13:028.05 8.05
20 Jun 2024, 11:248.2 8.2

Ammonia

ammoniacal nitrogen as N · code 0111 · mg/l

below 0.03 mg/l (not detected above this)

Sampled 7 May 2026, 5 months ago · 21 results banked

00.10.20.30.4mg/l20242025202620 Jun 2024, 11:24: 0.065 mg/l27 Aug 2024, 16:38: below 0.03 mg/l (not detected above this)16 Sep 2024, 12:07: below 0.03 mg/l (not detected above this)14 Oct 2024, 09:35: 0.035 mg/l28 Nov 2024, 13:05: below 0.03 mg/l (not detected above this)24 Jan 2025, 13:36: 0.2 mg/l13 Feb 2025, 11:50: 0.091 mg/l13 Mar 2025, 12:08: 0.16 mg/l25 Apr 2025, 15:34: below 0.03 mg/l (not detected above this)16 Jun 2025, 14:08: below 0.03 mg/l (not detected above this)16 Jul 2025, 12:59: below 0.03 mg/l (not detected above this)1 Aug 2025, 11:34: below 0.03 mg/l (not detected above this)4 Sep 2025, 15:09: below 0.03 mg/l (not detected above this)14 Oct 2025, 11:39: below 0.03 mg/l (not detected above this)6 Nov 2025, 13:59: below 0.03 mg/l (not detected above this)2 Dec 2025, 10:00: below 0.03 mg/l (not detected above this)12 Jan 2026, 12:03: below 0.03 mg/l (not detected above this)4 Feb 2026, 10:37: 0.31 mg/l1 Apr 2026, 14:23: below 0.03 mg/l (not detected above this)21 Apr 2026, 11:16: below 0.03 mg/l (not detected above this)7 May 2026, 14:04: below 0.03 mg/l (not detected above this)
Every result (21)
SampledResult as publishedReads as
7 May 2026, 14:04<0.03 below 0.03 mg/l (not detected above this)
21 Apr 2026, 11:16<0.03 below 0.03 mg/l (not detected above this)
1 Apr 2026, 14:23<0.03 below 0.03 mg/l (not detected above this)
4 Feb 2026, 10:370.31 0.31 mg/l
12 Jan 2026, 12:03<0.03 below 0.03 mg/l (not detected above this)
2 Dec 2025, 10:00<0.03 below 0.03 mg/l (not detected above this)
6 Nov 2025, 13:59<0.03 below 0.03 mg/l (not detected above this)
14 Oct 2025, 11:39<0.03 below 0.03 mg/l (not detected above this)
4 Sep 2025, 15:09<0.03 below 0.03 mg/l (not detected above this)
1 Aug 2025, 11:34<0.03 below 0.03 mg/l (not detected above this)
16 Jul 2025, 12:59<0.03 below 0.03 mg/l (not detected above this)
16 Jun 2025, 14:08<0.03 below 0.03 mg/l (not detected above this)
25 Apr 2025, 15:34<0.03 below 0.03 mg/l (not detected above this)
13 Mar 2025, 12:080.16 0.16 mg/l
13 Feb 2025, 11:500.091 0.091 mg/l
24 Jan 2025, 13:360.2 0.2 mg/l
28 Nov 2024, 13:05<0.03 below 0.03 mg/l (not detected above this)
14 Oct 2024, 09:350.035 0.035 mg/l
16 Sep 2024, 12:07<0.03 below 0.03 mg/l (not detected above this)
27 Aug 2024, 16:38<0.03 below 0.03 mg/l (not detected above this)
20 Jun 2024, 11:240.065 0.065 mg/l

Nitrate

as nitrogen (N) · code 0117 · mg/l

5.48 mg/l

Sampled 7 May 2026, 5 months ago · 21 results banked

46810mg/l20242025202620 Jun 2024, 11:24: 5.77 mg/l27 Aug 2024, 16:38: 6.29 mg/l16 Sep 2024, 12:07: 6.19 mg/l14 Oct 2024, 09:35: 7.78 mg/l28 Nov 2024, 13:05: 4.29 mg/l24 Jan 2025, 13:36: 4.88 mg/l13 Feb 2025, 11:50: 5.78 mg/l13 Mar 2025, 12:08: 5.58 mg/l25 Apr 2025, 15:34: 4.69 mg/l16 Jun 2025, 14:08: 5.68 mg/l16 Jul 2025, 12:59: 5.59 mg/l1 Aug 2025, 11:34: 5.8 mg/l4 Sep 2025, 15:09: 6.09 mg/l14 Oct 2025, 11:39: 6.09 mg/l6 Nov 2025, 13:59: 8.59 mg/l2 Dec 2025, 10:00: 9.19 mg/l12 Jan 2026, 12:03: 5.79 mg/l4 Feb 2026, 10:37: 4.59 mg/l1 Apr 2026, 14:23: 5.29 mg/l21 Apr 2026, 11:16: 5.29 mg/l7 May 2026, 14:04: 5.48 mg/l
Every result (21)
SampledResult as publishedReads as
7 May 2026, 14:045.48 5.48 mg/l
21 Apr 2026, 11:165.29 5.29 mg/l
1 Apr 2026, 14:235.29 5.29 mg/l
4 Feb 2026, 10:374.59 4.59 mg/l
12 Jan 2026, 12:035.79 5.79 mg/l
2 Dec 2025, 10:009.19 9.19 mg/l
6 Nov 2025, 13:598.59 8.59 mg/l
14 Oct 2025, 11:396.09 6.09 mg/l
4 Sep 2025, 15:096.09 6.09 mg/l
1 Aug 2025, 11:345.8 5.8 mg/l
16 Jul 2025, 12:595.59 5.59 mg/l
16 Jun 2025, 14:085.68 5.68 mg/l
25 Apr 2025, 15:344.69 4.69 mg/l
13 Mar 2025, 12:085.58 5.58 mg/l
13 Feb 2025, 11:505.78 5.78 mg/l
24 Jan 2025, 13:364.88 4.88 mg/l
28 Nov 2024, 13:054.29 4.29 mg/l
14 Oct 2024, 09:357.78 7.78 mg/l
16 Sep 2024, 12:076.19 6.19 mg/l
27 Aug 2024, 16:386.29 6.29 mg/l
20 Jun 2024, 11:245.77 5.77 mg/l

Phosphate

orthophosphate, reactive, as P · code 0180 · mg/l

0.083 mg/l

Sampled 7 May 2026, 5 months ago · 21 results banked

00.050.10.150.2mg/l20242025202620 Jun 2024, 11:24: 0.057 mg/l27 Aug 2024, 16:38: 0.059 mg/l16 Sep 2024, 12:07: 0.064 mg/l14 Oct 2024, 09:35: 0.15 mg/l28 Nov 2024, 13:05: 0.12 mg/l24 Jan 2025, 13:36: 0.2 mg/l13 Feb 2025, 11:50: 0.094 mg/l13 Mar 2025, 12:08: 0.077 mg/l25 Apr 2025, 15:34: 0.049 mg/l16 Jun 2025, 14:08: 0.067 mg/l16 Jul 2025, 12:59: 0.075 mg/l1 Aug 2025, 11:34: 0.071 mg/l4 Sep 2025, 15:09: 0.13 mg/l14 Oct 2025, 11:39: 0.056 mg/l6 Nov 2025, 13:59: 0.1 mg/l2 Dec 2025, 10:00: 0.13 mg/l12 Jan 2026, 12:03: 0.089 mg/l4 Feb 2026, 10:37: 0.14 mg/l1 Apr 2026, 14:23: 0.05 mg/l21 Apr 2026, 11:16: 0.025 mg/l7 May 2026, 14:04: 0.083 mg/l
Every result (21)
SampledResult as publishedReads as
7 May 2026, 14:040.083 0.083 mg/l
21 Apr 2026, 11:160.025 0.025 mg/l
1 Apr 2026, 14:230.05 0.05 mg/l
4 Feb 2026, 10:370.14 0.14 mg/l
12 Jan 2026, 12:030.089 0.089 mg/l
2 Dec 2025, 10:000.13 0.13 mg/l
6 Nov 2025, 13:590.1 0.1 mg/l
14 Oct 2025, 11:390.056 0.056 mg/l
4 Sep 2025, 15:090.13 0.13 mg/l
1 Aug 2025, 11:340.071 0.071 mg/l
16 Jul 2025, 12:590.075 0.075 mg/l
16 Jun 2025, 14:080.067 0.067 mg/l
25 Apr 2025, 15:340.049 0.049 mg/l
13 Mar 2025, 12:080.077 0.077 mg/l
13 Feb 2025, 11:500.094 0.094 mg/l
24 Jan 2025, 13:360.2 0.2 mg/l
28 Nov 2024, 13:050.12 0.12 mg/l
14 Oct 2024, 09:350.15 0.15 mg/l
16 Sep 2024, 12:070.064 0.064 mg/l
27 Aug 2024, 16:380.059 0.059 mg/l
20 Jun 2024, 11:240.057 0.057 mg/l

Conductivity

at 25 °C · code 0077 · µS/cm

547 µS/cm

Sampled 7 May 2026, 5 months ago · 23 results banked

300400500600700800µS/cm20242025202620 Jun 2024, 11:24: 554 µS/cm25 Jul 2024, 13:02: 565 µS/cm27 Aug 2024, 16:38: 593 µS/cm16 Sep 2024, 12:07: 584 µS/cm14 Oct 2024, 09:35: 423 µS/cm28 Nov 2024, 13:05: 351 µS/cm5 Dec 2024, 13:08: 711 µS/cm24 Jan 2025, 13:36: 441 µS/cm13 Feb 2025, 11:50: 482 µS/cm13 Mar 2025, 12:08: 518 µS/cm25 Apr 2025, 15:34: 451 µS/cm16 Jun 2025, 14:08: 558 µS/cm16 Jul 2025, 12:59: 583 µS/cm1 Aug 2025, 11:34: 580 µS/cm4 Sep 2025, 15:09: 578 µS/cm14 Oct 2025, 11:39: 612 µS/cm6 Nov 2025, 13:59: 623 µS/cm2 Dec 2025, 10:00: 492 µS/cm12 Jan 2026, 12:03: 475 µS/cm4 Feb 2026, 10:37: 403 µS/cm1 Apr 2026, 14:23: 508 µS/cm21 Apr 2026, 11:16: 514 µS/cm7 May 2026, 14:04: 547 µS/cm
Every result (23)
SampledResult as publishedReads as
7 May 2026, 14:04547 547 µS/cm
21 Apr 2026, 11:16514 514 µS/cm
1 Apr 2026, 14:23508 508 µS/cm
4 Feb 2026, 10:37403 403 µS/cm
12 Jan 2026, 12:03475 475 µS/cm
2 Dec 2025, 10:00492 492 µS/cm
6 Nov 2025, 13:59623 623 µS/cm
14 Oct 2025, 11:39612 612 µS/cm
4 Sep 2025, 15:09578 578 µS/cm
1 Aug 2025, 11:34580 580 µS/cm
16 Jul 2025, 12:59583 583 µS/cm
16 Jun 2025, 14:08558 558 µS/cm
25 Apr 2025, 15:34451 451 µS/cm
13 Mar 2025, 12:08518 518 µS/cm
13 Feb 2025, 11:50482 482 µS/cm
24 Jan 2025, 13:36441 441 µS/cm
5 Dec 2024, 13:08711 711 µS/cm
28 Nov 2024, 13:05351 351 µS/cm
14 Oct 2024, 09:35423 423 µS/cm
16 Sep 2024, 12:07584 584 µS/cm
27 Aug 2024, 16:38593 593 µS/cm
25 Jul 2024, 13:02565 565 µS/cm
20 Jun 2024, 11:24554 554 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
DeterminandMaterialResults First – lastLatest result
Oxygen, Dissolved, % Saturation 9901 River water 23 Jun 2024 – May 2026 95.5% 7 May 2026
Oxygen, Dissolved as O2 9924 River water 23 Jun 2024 – May 2026 10 mg/l 7 May 2026
Temperature of Water 0076 River water 23 Jun 2024 – May 2026 13 °C 7 May 2026
pH 0061 River water 23 Jun 2024 – May 2026 8.16 7 May 2026
Ammoniacal Nitrogen as N 0111 River water 21 Jun 2024 – May 2026 below 0.03 mg/l 7 May 2026
Nitrate as N 0117 River water 21 Jun 2024 – May 2026 5.48 mg/l 7 May 2026
Orthophosphate, reactive as P 0180 River water 21 Jun 2024 – May 2026 0.083 mg/l 7 May 2026
Conductivity at 25 C 0077 River water 23 Jun 2024 – May 2026 547 µS/cm 7 May 2026
Alkalinity to pH 4.5 as CaCO3 0162 River water 21 Jun 2024 – May 2026 230 mg/l 7 May 2026
Ammonia un-ionised as N 0119 River water 21 Jun 2024 – May 2026 below 0.00068 mg/l 7 May 2026
BOD : 5 Day ATU 0085 River water 20 Jun 2024 – May 2026 1.3 mg/l 7 May 2026
Nitrite as N 0118 River water 21 Jun 2024 – May 2026 0.018 mg/l 7 May 2026
Nitrogen, Total Oxidised as N 0116 River water 21 Jun 2024 – May 2026 5.5 mg/l 7 May 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.