Mor Brook confluence

EA name: MOR BROOK CONFLUENCE
Environment Agency sampling point MD-24585380 · 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
26 May 2026, 12:584 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
22 since 17 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 373100, 288800As published, to the nearest 100 m (so up to about 70 m out). Open in a map
River, by its own name
Mor Brook
River, by the map
Mor BrookPlaced on the river its name gives, 35 m from the line.
Next gauge downstream
Bewdley On the River Severn · 16 km along the river
Nearest gauge upstream
Mor Brook On the Moors River · 3.2 km along the river
Why it was sampled
Monitoring (national agency policy) (13 samples)
Environmental monitoring statutory (EU directives) (9 samples)

Main measurements, river water

Dissolved oxygen

% saturation · code 9901 · %

102.4%

Sampled 26 May 2026, 4 months ago · 22 results banked

90100110120%20242025202617 Jun 2024, 10:08: 99.5%18 Jul 2024, 12:20: 101.9%30 Aug 2024, 11:01: 99.9%23 Sep 2024, 12:43: 97.3%29 Oct 2024, 10:16: 101.7%16 Dec 2024, 10:44: 101.3%29 Jan 2025, 12:44: 100.9%21 Feb 2025, 13:52: 102.2%18 Mar 2025, 11:51: 113%4 Apr 2025, 11:34: 117.3%29 May 2025, 13:03: 101.1%24 Jun 2025, 13:40: 102.8%22 Jul 2025, 10:21: 92.7%7 Aug 2025, 14:05: 97.6%2 Sep 2025, 13:25: 94.9%10 Oct 2025, 10:14: 91.3%5 Nov 2025, 11:23: 97.7%1 Dec 2025, 09:53: 102.7%12 Jan 2026, 11:28: 103.7%2 Feb 2026, 11:57: 100.7%5 Mar 2026, 15:52: 95.9%26 May 2026, 12:58: 102.4%
Every result (22)
SampledResult as publishedReads as
26 May 2026, 12:58102.4 102.4%
5 Mar 2026, 15:5295.9 95.9%
2 Feb 2026, 11:57100.7 100.7%
12 Jan 2026, 11:28103.7 103.7%
1 Dec 2025, 09:53102.7 102.7%
5 Nov 2025, 11:2397.7 97.7%
10 Oct 2025, 10:1491.3 91.3%
2 Sep 2025, 13:2594.9 94.9%
7 Aug 2025, 14:0597.6 97.6%
22 Jul 2025, 10:2192.7 92.7%
24 Jun 2025, 13:40102.8 102.8%
29 May 2025, 13:03101.1 101.1%
4 Apr 2025, 11:34117.3 117.3%
18 Mar 2025, 11:51113 113%
21 Feb 2025, 13:52102.2 102.2%
29 Jan 2025, 12:44100.9 100.9%
16 Dec 2024, 10:44101.3 101.3%
29 Oct 2024, 10:16101.7 101.7%
23 Sep 2024, 12:4397.3 97.3%
30 Aug 2024, 11:0199.9 99.9%
18 Jul 2024, 12:20101.9 101.9%
17 Jun 2024, 10:0899.5 99.5%

Dissolved oxygen

as O2 · code 9924 · mg/l

9.63 mg/l

Sampled 26 May 2026, 4 months ago · 22 results banked

8101214mg/l20242025202617 Jun 2024, 10:08: 10.6 mg/l18 Jul 2024, 12:20: 10.2 mg/l30 Aug 2024, 11:01: 10.6 mg/l23 Sep 2024, 12:43: 10.1 mg/l29 Oct 2024, 10:16: 11 mg/l16 Dec 2024, 10:44: 11.7 mg/l29 Jan 2025, 12:44: 12.5 mg/l21 Feb 2025, 13:52: 11.7 mg/l18 Mar 2025, 11:51: 13.8 mg/l4 Apr 2025, 11:34: 13 mg/l29 May 2025, 13:03: 10.2 mg/l24 Jun 2025, 13:40: 9.91 mg/l22 Jul 2025, 10:21: 9.09 mg/l7 Aug 2025, 14:05: 9.55 mg/l2 Sep 2025, 13:25: 9.69 mg/l10 Oct 2025, 10:14: 9.82 mg/l5 Nov 2025, 11:23: 10.4 mg/l1 Dec 2025, 09:53: 12.2 mg/l12 Jan 2026, 11:28: 12.9 mg/l2 Feb 2026, 11:57: 12.1 mg/l5 Mar 2026, 15:52: 10.9 mg/l26 May 2026, 12:58: 9.63 mg/l
Every result (22)
SampledResult as publishedReads as
26 May 2026, 12:589.63 9.63 mg/l
5 Mar 2026, 15:5210.9 10.9 mg/l
2 Feb 2026, 11:5712.1 12.1 mg/l
12 Jan 2026, 11:2812.9 12.9 mg/l
1 Dec 2025, 09:5312.2 12.2 mg/l
5 Nov 2025, 11:2310.4 10.4 mg/l
10 Oct 2025, 10:149.82 9.82 mg/l
2 Sep 2025, 13:259.69 9.69 mg/l
7 Aug 2025, 14:059.55 9.55 mg/l
22 Jul 2025, 10:219.09 9.09 mg/l
24 Jun 2025, 13:409.91 9.91 mg/l
29 May 2025, 13:0310.2 10.2 mg/l
4 Apr 2025, 11:3413 13 mg/l
18 Mar 2025, 11:5113.8 13.8 mg/l
21 Feb 2025, 13:5211.7 11.7 mg/l
29 Jan 2025, 12:4412.5 12.5 mg/l
16 Dec 2024, 10:4411.7 11.7 mg/l
29 Oct 2024, 10:1611 11 mg/l
23 Sep 2024, 12:4310.1 10.1 mg/l
30 Aug 2024, 11:0110.6 10.6 mg/l
18 Jul 2024, 12:2010.2 10.2 mg/l
17 Jun 2024, 10:0810.6 10.6 mg/l

Water temperature

code 0076 · °C

18.2 °C

Sampled 26 May 2026, 4 months ago · 22 results banked

5101520°C20242025202617 Jun 2024, 10:08: 12.3 °C18 Jul 2024, 12:20: 15.4 °C30 Aug 2024, 11:01: 12.6 °C23 Sep 2024, 12:43: 13.7 °C29 Oct 2024, 10:16: 11.8 °C16 Dec 2024, 10:44: 8.9 °C29 Jan 2025, 12:44: 6.1 °C21 Feb 2025, 13:52: 9.2 °C18 Mar 2025, 11:51: 6.6 °C4 Apr 2025, 11:34: 10.7 °C29 May 2025, 13:03: 14.9 °C24 Jun 2025, 13:40: 17 °C22 Jul 2025, 10:21: 16.2 °C7 Aug 2025, 14:05: 16.3 °C2 Sep 2025, 13:25: 14.3 °C10 Oct 2025, 10:14: 12 °C5 Nov 2025, 11:23: 12.3 °C1 Dec 2025, 09:53: 7.7 °C12 Jan 2026, 11:28: 5.9 °C2 Feb 2026, 11:57: 7.5 °C5 Mar 2026, 15:52: 9.8 °C26 May 2026, 12:58: 18.2 °C
Every result (22)
SampledResult as publishedReads as
26 May 2026, 12:5818.2 18.2 °C
5 Mar 2026, 15:529.8 9.8 °C
2 Feb 2026, 11:577.5 7.5 °C
12 Jan 2026, 11:285.9 5.9 °C
1 Dec 2025, 09:537.7 7.7 °C
5 Nov 2025, 11:2312.3 12.3 °C
10 Oct 2025, 10:1412 12 °C
2 Sep 2025, 13:2514.3 14.3 °C
7 Aug 2025, 14:0516.3 16.3 °C
22 Jul 2025, 10:2116.2 16.2 °C
24 Jun 2025, 13:4017 17 °C
29 May 2025, 13:0314.9 14.9 °C
4 Apr 2025, 11:3410.7 10.7 °C
18 Mar 2025, 11:516.6 6.6 °C
21 Feb 2025, 13:529.2 9.2 °C
29 Jan 2025, 12:446.1 6.1 °C
16 Dec 2024, 10:448.9 8.9 °C
29 Oct 2024, 10:1611.8 11.8 °C
23 Sep 2024, 12:4313.7 13.7 °C
30 Aug 2024, 11:0112.6 12.6 °C
18 Jul 2024, 12:2015.4 15.4 °C
17 Jun 2024, 10:0812.3 12.3 °C

pH

code 0061

8.24

Sampled 26 May 2026, 4 months ago · 22 results banked

88.28.48.620242025202617 Jun 2024, 10:08: 8.3518 Jul 2024, 12:20: 8.2930 Aug 2024, 11:01: 8.3823 Sep 2024, 12:43: 8.3529 Oct 2024, 10:16: 8.2316 Dec 2024, 10:44: 8.129 Jan 2025, 12:44: 8.2521 Feb 2025, 13:52: 8.4718 Mar 2025, 11:51: 8.544 Apr 2025, 11:34: 8.4929 May 2025, 13:03: 8.3724 Jun 2025, 13:40: 8.3222 Jul 2025, 10:21: 8.27 Aug 2025, 14:05: 8.382 Sep 2025, 13:25: 8.3810 Oct 2025, 10:14: 8.175 Nov 2025, 11:23: 8.151 Dec 2025, 09:53: 8.2512 Jan 2026, 11:28: 8.092 Feb 2026, 11:57: 8.255 Mar 2026, 15:52: 8.526 May 2026, 12:58: 8.24
Every result (22)
SampledResult as publishedReads as
26 May 2026, 12:588.24 8.24
5 Mar 2026, 15:528.5 8.5
2 Feb 2026, 11:578.25 8.25
12 Jan 2026, 11:288.09 8.09
1 Dec 2025, 09:538.25 8.25
5 Nov 2025, 11:238.15 8.15
10 Oct 2025, 10:148.17 8.17
2 Sep 2025, 13:258.38 8.38
7 Aug 2025, 14:058.38 8.38
22 Jul 2025, 10:218.2 8.2
24 Jun 2025, 13:408.32 8.32
29 May 2025, 13:038.37 8.37
4 Apr 2025, 11:348.49 8.49
18 Mar 2025, 11:518.54 8.54
21 Feb 2025, 13:528.47 8.47
29 Jan 2025, 12:448.25 8.25
16 Dec 2024, 10:448.1 8.1
29 Oct 2024, 10:168.23 8.23
23 Sep 2024, 12:438.35 8.35
30 Aug 2024, 11:018.38 8.38
18 Jul 2024, 12:208.29 8.29
17 Jun 2024, 10:088.35 8.35

Ammonia

ammoniacal nitrogen as N · code 0111 · mg/l

0.034 mg/l

Sampled 26 May 2026, 4 months ago · 22 results banked

0.030.040.050.060.07mg/l20242025202617 Jun 2024, 10:08: below 0.03 mg/l (not detected above this)18 Jul 2024, 12:20: below 0.03 mg/l (not detected above this)30 Aug 2024, 11:01: 0.067 mg/l23 Sep 2024, 12:43: below 0.03 mg/l (not detected above this)29 Oct 2024, 10:16: below 0.03 mg/l (not detected above this)16 Dec 2024, 10:44: below 0.03 mg/l (not detected above this)29 Jan 2025, 12:44: below 0.03 mg/l (not detected above this)21 Feb 2025, 13:52: below 0.03 mg/l (not detected above this)18 Mar 2025, 11:51: below 0.03 mg/l (not detected above this)4 Apr 2025, 11:34: below 0.03 mg/l (not detected above this)29 May 2025, 13:03: 0.036 mg/l24 Jun 2025, 13:40: below 0.03 mg/l (not detected above this)22 Jul 2025, 10:21: below 0.03 mg/l (not detected above this)7 Aug 2025, 14:05: below 0.03 mg/l (not detected above this)2 Sep 2025, 13:25: below 0.03 mg/l (not detected above this)10 Oct 2025, 10:14: below 0.03 mg/l (not detected above this)5 Nov 2025, 11:23: below 0.03 mg/l (not detected above this)1 Dec 2025, 09:53: below 0.03 mg/l (not detected above this)12 Jan 2026, 11:28: below 0.03 mg/l (not detected above this)2 Feb 2026, 11:57: below 0.03 mg/l (not detected above this)5 Mar 2026, 15:52: below 0.03 mg/l (not detected above this)26 May 2026, 12:58: 0.034 mg/l
Every result (22)
SampledResult as publishedReads as
26 May 2026, 12:580.034 0.034 mg/l
5 Mar 2026, 15:52<0.03 below 0.03 mg/l (not detected above this)
2 Feb 2026, 11:57<0.03 below 0.03 mg/l (not detected above this)
12 Jan 2026, 11:28<0.03 below 0.03 mg/l (not detected above this)
1 Dec 2025, 09:53<0.03 below 0.03 mg/l (not detected above this)
5 Nov 2025, 11:23<0.03 below 0.03 mg/l (not detected above this)
10 Oct 2025, 10:14<0.03 below 0.03 mg/l (not detected above this)
2 Sep 2025, 13:25<0.03 below 0.03 mg/l (not detected above this)
7 Aug 2025, 14:05<0.03 below 0.03 mg/l (not detected above this)
22 Jul 2025, 10:21<0.03 below 0.03 mg/l (not detected above this)
24 Jun 2025, 13:40<0.03 below 0.03 mg/l (not detected above this)
29 May 2025, 13:030.036 0.036 mg/l
4 Apr 2025, 11:34<0.03 below 0.03 mg/l (not detected above this)
18 Mar 2025, 11:51<0.03 below 0.03 mg/l (not detected above this)
21 Feb 2025, 13:52<0.03 below 0.03 mg/l (not detected above this)
29 Jan 2025, 12:44<0.03 below 0.03 mg/l (not detected above this)
16 Dec 2024, 10:44<0.03 below 0.03 mg/l (not detected above this)
29 Oct 2024, 10:16<0.03 below 0.03 mg/l (not detected above this)
23 Sep 2024, 12:43<0.03 below 0.03 mg/l (not detected above this)
30 Aug 2024, 11:010.067 0.067 mg/l
18 Jul 2024, 12:20<0.03 below 0.03 mg/l (not detected above this)
17 Jun 2024, 10:08<0.03 below 0.03 mg/l (not detected above this)

Nitrate

as nitrogen (N) · code 0117 · mg/l

6.48 mg/l

Sampled 26 May 2026, 4 months ago · 22 results banked

246810mg/l20242025202617 Jun 2024, 10:08: 4.99 mg/l18 Jul 2024, 12:20: 5.99 mg/l30 Aug 2024, 11:01: 3.9 mg/l23 Sep 2024, 12:43: 5.29 mg/l29 Oct 2024, 10:16: 6.59 mg/l16 Dec 2024, 10:44: 6.79 mg/l29 Jan 2025, 12:44: 5.09 mg/l21 Feb 2025, 13:52: 6.49 mg/l18 Mar 2025, 11:51: 7.79 mg/l4 Apr 2025, 11:34: 7.18 mg/l29 May 2025, 13:03: 6.47 mg/l24 Jun 2025, 13:40: 6.79 mg/l22 Jul 2025, 10:21: 5.29 mg/l7 Aug 2025, 14:05: 6.99 mg/l2 Sep 2025, 13:25: 6.69 mg/l10 Oct 2025, 10:14: 6.19 mg/l5 Nov 2025, 11:23: 8.28 mg/l1 Dec 2025, 09:53: 7.59 mg/l12 Jan 2026, 11:28: 4.7 mg/l2 Feb 2026, 11:57: 5.1 mg/l5 Mar 2026, 15:52: 6.69 mg/l26 May 2026, 12:58: 6.48 mg/l
Every result (22)
SampledResult as publishedReads as
26 May 2026, 12:586.48 6.48 mg/l
5 Mar 2026, 15:526.69 6.69 mg/l
2 Feb 2026, 11:575.1 5.1 mg/l
12 Jan 2026, 11:284.7 4.7 mg/l
1 Dec 2025, 09:537.59 7.59 mg/l
5 Nov 2025, 11:238.28 8.28 mg/l
10 Oct 2025, 10:146.19 6.19 mg/l
2 Sep 2025, 13:256.69 6.69 mg/l
7 Aug 2025, 14:056.99 6.99 mg/l
22 Jul 2025, 10:215.29 5.29 mg/l
24 Jun 2025, 13:406.79 6.79 mg/l
29 May 2025, 13:036.47 6.47 mg/l
4 Apr 2025, 11:347.18 7.18 mg/l
18 Mar 2025, 11:517.79 7.79 mg/l
21 Feb 2025, 13:526.49 6.49 mg/l
29 Jan 2025, 12:445.09 5.09 mg/l
16 Dec 2024, 10:446.79 6.79 mg/l
29 Oct 2024, 10:166.59 6.59 mg/l
23 Sep 2024, 12:435.29 5.29 mg/l
30 Aug 2024, 11:013.9 3.9 mg/l
18 Jul 2024, 12:205.99 5.99 mg/l
17 Jun 2024, 10:084.99 4.99 mg/l

Phosphate

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

0.041 mg/l

Sampled 26 May 2026, 4 months ago · 22 results banked

00.20.40.6mg/l20242025202617 Jun 2024, 10:08: 0.071 mg/l18 Jul 2024, 12:20: 0.054 mg/l30 Aug 2024, 11:01: 0.053 mg/l23 Sep 2024, 12:43: 0.1 mg/l29 Oct 2024, 10:16: 0.032 mg/l16 Dec 2024, 10:44: 0.49 mg/l29 Jan 2025, 12:44: 0.054 mg/l21 Feb 2025, 13:52: 0.048 mg/l18 Mar 2025, 11:51: 0.045 mg/l4 Apr 2025, 11:34: below 0.01 mg/l (not detected above this)29 May 2025, 13:03: 0.062 mg/l24 Jun 2025, 13:40: 0.071 mg/l22 Jul 2025, 10:21: 0.079 mg/l7 Aug 2025, 14:05: 0.1 mg/l2 Sep 2025, 13:25: 0.065 mg/l10 Oct 2025, 10:14: 0.046 mg/l5 Nov 2025, 11:23: 0.059 mg/l1 Dec 2025, 09:53: 0.072 mg/l12 Jan 2026, 11:28: 0.092 mg/l2 Feb 2026, 11:57: 0.068 mg/l5 Mar 2026, 15:52: 0.043 mg/l26 May 2026, 12:58: 0.041 mg/l
Every result (22)
SampledResult as publishedReads as
26 May 2026, 12:580.041 0.041 mg/l
5 Mar 2026, 15:520.043 0.043 mg/l
2 Feb 2026, 11:570.068 0.068 mg/l
12 Jan 2026, 11:280.092 0.092 mg/l
1 Dec 2025, 09:530.072 0.072 mg/l
5 Nov 2025, 11:230.059 0.059 mg/l
10 Oct 2025, 10:140.046 0.046 mg/l
2 Sep 2025, 13:250.065 0.065 mg/l
7 Aug 2025, 14:050.1 0.1 mg/l
22 Jul 2025, 10:210.079 0.079 mg/l
24 Jun 2025, 13:400.071 0.071 mg/l
29 May 2025, 13:030.062 0.062 mg/l
4 Apr 2025, 11:34<0.01 below 0.01 mg/l (not detected above this)
18 Mar 2025, 11:510.045 0.045 mg/l
21 Feb 2025, 13:520.048 0.048 mg/l
29 Jan 2025, 12:440.054 0.054 mg/l
16 Dec 2024, 10:440.49 0.49 mg/l
29 Oct 2024, 10:160.032 0.032 mg/l
23 Sep 2024, 12:430.1 0.1 mg/l
30 Aug 2024, 11:010.053 0.053 mg/l
18 Jul 2024, 12:200.054 0.054 mg/l
17 Jun 2024, 10:080.071 0.071 mg/l

Conductivity

at 25 °C · code 0077 · µS/cm

646 µS/cm

Sampled 26 May 2026, 4 months ago · 22 results banked

200400600800µS/cm20242025202617 Jun 2024, 10:08: 521 µS/cm18 Jul 2024, 12:20: 618 µS/cm30 Aug 2024, 11:01: 663 µS/cm23 Sep 2024, 12:43: 561 µS/cm29 Oct 2024, 10:16: 601 µS/cm16 Dec 2024, 10:44: 576 µS/cm29 Jan 2025, 12:44: 425 µS/cm21 Feb 2025, 13:52: 602 µS/cm18 Mar 2025, 11:51: 613 µS/cm4 Apr 2025, 11:34: 617 µS/cm29 May 2025, 13:03: 639 µS/cm24 Jun 2025, 13:40: 580 µS/cm22 Jul 2025, 10:21: 594 µS/cm7 Aug 2025, 14:05: 689 µS/cm2 Sep 2025, 13:25: 696 µS/cm10 Oct 2025, 10:14: 701 µS/cm5 Nov 2025, 11:23: 575 µS/cm1 Dec 2025, 09:53: 486 µS/cm12 Jan 2026, 11:28: 277 µS/cm2 Feb 2026, 11:57: 398 µS/cm5 Mar 2026, 15:52: 541 µS/cm26 May 2026, 12:58: 646 µS/cm
Every result (22)
SampledResult as publishedReads as
26 May 2026, 12:58646 646 µS/cm
5 Mar 2026, 15:52541 541 µS/cm
2 Feb 2026, 11:57398 398 µS/cm
12 Jan 2026, 11:28277 277 µS/cm
1 Dec 2025, 09:53486 486 µS/cm
5 Nov 2025, 11:23575 575 µS/cm
10 Oct 2025, 10:14701 701 µS/cm
2 Sep 2025, 13:25696 696 µS/cm
7 Aug 2025, 14:05689 689 µS/cm
22 Jul 2025, 10:21594 594 µS/cm
24 Jun 2025, 13:40580 580 µS/cm
29 May 2025, 13:03639 639 µS/cm
4 Apr 2025, 11:34617 617 µS/cm
18 Mar 2025, 11:51613 613 µS/cm
21 Feb 2025, 13:52602 602 µS/cm
29 Jan 2025, 12:44425 425 µS/cm
16 Dec 2024, 10:44576 576 µS/cm
29 Oct 2024, 10:16601 601 µS/cm
23 Sep 2024, 12:43561 561 µS/cm
30 Aug 2024, 11:01663 663 µS/cm
18 Jul 2024, 12:20618 618 µS/cm
17 Jun 2024, 10:08521 521 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 22 Jun 2024 – May 2026 102.4% 26 May 2026
Oxygen, Dissolved as O2 9924 River water 22 Jun 2024 – May 2026 9.63 mg/l 26 May 2026
Temperature of Water 0076 River water 22 Jun 2024 – May 2026 18.2 °C 26 May 2026
pH 0061 River water 22 Jun 2024 – May 2026 8.24 26 May 2026
Ammoniacal Nitrogen as N 0111 River water 22 Jun 2024 – May 2026 0.034 mg/l 26 May 2026
Nitrate as N 0117 River water 22 Jun 2024 – May 2026 6.48 mg/l 26 May 2026
Orthophosphate, reactive as P 0180 River water 22 Jun 2024 – May 2026 0.041 mg/l 26 May 2026
Conductivity at 25 C 0077 River water 22 Jun 2024 – May 2026 646 µS/cm 26 May 2026
Alkalinity to pH 4.5 as CaCO3 0162 River water 22 Jun 2024 – May 2026 240 mg/l 26 May 2026
Ammonia un-ionised as N 0119 River water 22 Jun 2024 – May 2026 0.00113 mg/l 26 May 2026
BOD : 5 Day ATU 0085 River water 21 Jun 2024 – May 2026 below 1 mg/l 26 May 2026
Nitrite as N 0118 River water 22 Jun 2024 – May 2026 0.022 mg/l 26 May 2026
Nitrogen, Total Oxidised as N 0116 River water 22 Jun 2024 – May 2026 6.5 mg/l 26 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.