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Compton Castle

SBB00301
Overflow on the network feeding Compton And Marldon STW · Combined sewer overflow
Shellfish water · Teign Estuary
Showing history for 2021 · records go back to 2020
Not spilling

The monitor is reporting and shows no discharge.

Last spill ended
8 Sept, 10:44
Counted spills, 2021
112
214 discharge events
Hours spilled, 2021
1,016
Is the feed working?
Working
Last checked 21 min ago · we poll SWW hourly
48h agonow
48/48 hourly readings received
Dry spills, 2021
0
None in 2021 · 134 since 2020
How a dry spill is decided →
Spilled before its STW, 2021
191
191 in 2021 · 1424 since 2020
What this means →
Why this one spills

This looks like a fault, not a storm.

This overflow has discharged in dry weather 134 times since 2020 — spills with no rainfall to excuse them. Its treatment works is not itself over capacity, so a catchment-wide explanation does not hold. Applied to this record, the two-stage lawfulness test is hard to pass: a recurring dry-weather discharge is not an exceptional circumstance, and where the remedy is routine maintenance the disproportionate-cost exception is hard to run.

How this verdict is reached →

Can its works cope?

Full capacity view →

This overflow drains to Compton And Marldon STW, serving about 2,303 people.

—
of permitted flow
Not assessed

The works has headroom — so spills here point to another problem, often on that branch of the network (a blockage, a failed pump or infiltration).

Its permit

What the environmental permit sets for this overflow — and where the public record is silent, which is itself the finding.

Pass-forward flow
Not published
Spill frequency limit
None set
Monitoring tier
Not published
Assessment trigger
Crossed — over 10 spills/year

Is anyone acting on this?

Flagged problems
High spill frequency1,659 discharge events since 2020Very long spills645 hours in the last full yearDry spilling134 dry spills since 2020Spills before its works1424 times since 2020
Measures on record
  • Investigation to meet EnvAct INV4 Driver
    Investigationdue 2027
  • Reduction of spills to meet EnvAct_IMP drivers
    Improvementdue 2028
Verdict
Improvement under way

A physical improvement is committed against this overflow.

What you can do about this one

OPEN NOW

Ask for the data

Under the Environmental Information Regulations, Compton Castle's telemetry, the works' flow-to-full-treatment setting, and any spill investigations are emissions information — they cannot be withheld on commercial-confidentiality grounds. A written request is the fastest lever.

BY 30 APR 2027

Get it into the next programme

Investigations that will shape the 2030–35 environment programme must complete by this date. Putting this overflow on the record now — to South West Water and the Environment Agency — is what gets it considered.

BY 1 NOV 2027

Put it in the drainage plan

South West Water's draft Drainage & Wastewater Management Plan goes to a twelve-week consultation. A named overflow with evidence behind it is far harder to leave out.

The record since 2020

134 dry spills and 1424 pre-STW spills since 2020. Pick a year to see its events below.

Count by

2021: 112 spills · 214 discharge events

15320201122021110202214220231442024692025942026

Counted spills — the EA's 12/24-hour block method, the basis of the 10-a-year cap. Published annual return where available, computed the same way for the current year. Two ways to count →

Dry spills, every year

63 dry spills since 2020 · showing up to 12

31 Dec, 05:34
18h 26m
0.1
Not spilling
→
31 Dec, 04:56
28m
0.1
Not spilling
→
31 Dec, 04:22
26m
0.1
Not spilling
→
29 Dec, 12:12
40h 2m
0.1
Not spilling
→
13 Apr, 19:28
12h 2m
0.0
Not spilling
→
13 Apr, 05:30
13h 58m
0.0
Not spilling
→
12 Apr, 19:12
10h 18m
0.0
Not spilling
→
21 Mar, 16:38
28m
0.1
Not spilling
→
7 Mar, 06:24
259h 56m
0.1
Not spilling
→
19 Feb, 23:42
20m
0.2
Not spilling
→
19 Feb, 22:54
18m
0.2
Not spilling
→
19 Feb, 21:48
1h 6m
0.2
Not spilling
→

Spilled before its works

937 events since 2020 · started while Compton And Marldon STW stayed shut

8 Sept, 09:00
1h 45m
17.1
Stayed shut
→
6 Jun, 02:32
34m
15.2
Stayed shut
→
1 Jun, 21:46
36m
17.5
Stayed shut
→
1 Jun, 20:56
34m
17.5
Stayed shut
→
19 May, 01:46
1h 20m
14.2
Stayed shut
→
2 May, 13:50
1h 24m
12.2
Stayed shut
→
15 Apr, 11:10
1h 24m
7.5
Stayed shut
→
14 Apr, 08:02
1h 2m
6.4
Stayed shut
→
11 Apr, 22:38
26m
10.3
Stayed shut
→
11 Apr, 18:28
20m
10.3
Stayed shut
→
24 Mar, 23:48
34m
4.3
Stayed shut
→
16 Mar, 08:52
18m
2.7
Stayed shut
→

Spills by month, 2021

Dry Wet weather
61Jan
Feb
1Mar
1Apr
45May
34Jun
20Jul
Aug
5Sep
20Oct
11Nov
16Dec

Every spill in 2021, most recent first

Each event checked against the nearest rain gauge and against the treatment works’ own overflow. Open any row for its evidence dossier.

31 Dec, 04:28
2h 24m
8.9 mm
Wet weather
Not spilling — flagged before STW
→
29 Dec, 12:48
28m
10.8 mm
Wet weather
Not spilling — flagged before STW
→
29 Dec, 04:12
24m
10.8 mm
Wet weather
Not spilling — flagged before STW
→
29 Dec, 03:06
20m
10.8 mm
Wet weather
Not spilling — flagged before STW
→
27 Dec, 17:06
1h 8m
8.8 mm
Wet weather
Not spilling — flagged before STW
→
27 Dec, 15:48
40m
8.8 mm
Wet weather
Not spilling — flagged before STW
→
27 Dec, 13:58
36m
8.8 mm
Wet weather
Not spilling — flagged before STW
→
27 Dec, 06:28
2h 44m
8.8 mm
Wet weather
Not spilling — flagged before STW
→
25 Dec, 11:46
4h 6m
18.4 mm
Wet weather
Not spilling — flagged before STW
→
25 Dec, 08:54
16m
18.4 mm
Wet weather
Not spilling — flagged before STW
→
25 Dec, 05:08
36m
18.4 mm
Wet weather
Not spilling — flagged before STW
→
24 Dec, 11:08
22m
13.2 mm
Wet weather
Not spilling — flagged before STW
→
7 Dec, 09:10
3h 42m
—
No rain data
Not spilling — flagged before STW
→
6 Dec, 10:08
40m
—
No rain data
Not spilling — flagged before STW
→
4 Dec, 02:30
20m
—
No rain data
Not spilling — flagged before STW
→
3 Dec, 18:04
16m
—
No rain data
Not spilling — flagged before STW
→
27 Nov, 00:52
24m
—
No rain data
Not spilling — flagged before STW
→
12 Nov, 11:42
28m
—
No rain data
Not spilling — flagged before STW
→
12 Nov, 06:44
28m
—
No rain data
Not spilling — flagged before STW
→
7 Nov, 10:42
34m
—
No rain data
Not spilling — flagged before STW
→
7 Nov, 09:40
56m
—
No rain data
Not spilling — flagged before STW
→
7 Nov, 09:20
16m
—
No rain data
Not spilling — flagged before STW
→
6 Nov, 09:00
3h 10m
—
No rain data
Not spilling — flagged before STW
→
5 Nov, 07:52
2h 6m
—
No rain data
Not spilling — flagged before STW
→
4 Nov, 08:44
20m
—
No rain data
Not spilling — flagged before STW
→
4 Nov, 08:14
28m
—
No rain data
Not spilling — flagged before STW
→
3 Nov, 13:52
48m
—
No rain data
Not spilling — flagged before STW
→
31 Oct, 07:04
5h 20m
—
No rain data
Not spilling — flagged before STW
→
31 Oct, 03:38
3h 26m
—
No rain data
Not spilling — flagged before STW
→
30 Oct, 02:02
3h 34m
—
No rain data
Not spilling — flagged before STW
→
28 Oct, 17:22
11h 2m
—
No rain data
Not spilling — flagged before STW
→
28 Oct, 15:20
2h 2m
—
No rain data
Not spilling — flagged before STW
→
20 Oct, 20:40
1h 54m
—
No rain data
Not spilling — flagged before STW
→
20 Oct, 18:18
1h 46m
—
No rain data
Not spilling — flagged before STW
→
20 Oct, 16:44
1h 4m
—
No rain data
Not spilling — flagged before STW
→
20 Oct, 10:28
24m
—
No rain data
Not spilling — flagged before STW
→
20 Oct, 00:44
36m
—
No rain data
Not spilling — flagged before STW
→
19 Oct, 22:26
1h 2m
—
No rain data
Not spilling — flagged before STW
→
19 Oct, 21:18
1h 8m
—
No rain data
Not spilling — flagged before STW
→
19 Oct, 16:46
2h 4m
—
No rain data
Not spilling — flagged before STW
→
18 Oct, 11:22
20m
—
No rain data
Not spilling — flagged before STW
→
4 Oct, 20:44
2h 44m
—
No rain data
Not spilling — flagged before STW
→
4 Oct, 14:38
34m
—
No rain data
Not spilling — flagged before STW
→
2 Oct, 14:10
44m
—
No rain data
Not spilling — flagged before STW
→
2 Oct, 13:26
38m
—
No rain data
Not spilling — flagged before STW
→
2 Oct, 11:38
1h 34m
—
No rain data
Not spilling — flagged before STW
→
2 Oct, 09:16
58m
—
No rain data
Not spilling — flagged before STW
→
28 Sept, 14:20
26m
—
No rain data
Not spilling — flagged before STW
→
28 Sept, 11:54
20m
—
No rain data
Not spilling — flagged before STW
→
28 Sept, 04:28
34m
—
No rain data
Not spilling — flagged before STW
→
28 Sept, 02:52
24m
—
No rain data
Not spilling — flagged before STW
→
27 Sept, 03:20
1h 12m
—
No rain data
Not spilling — flagged before STW
→
29 Jul, 23:10
18m
—
No rain data
Not spilling — flagged before STW
→
29 Jul, 21:18
1h 24m
—
No rain data
Not spilling — flagged before STW
→
27 Jul, 04:56
1h 2m
—
No rain data
Not spilling — flagged before STW
→
27 Jul, 04:22
34m
—
No rain data
Not spilling — flagged before STW
→
26 Jul, 15:04
16m
—
No rain data
Not spilling — flagged before STW
→
24 Jul, 00:22
1h 26m
—
No rain data
Not spilling — flagged before STW
→
11 Jul, 23:18
2h 30m
—
No rain data
Not spilling — flagged before STW
→
11 Jul, 13:22
52m
—
No rain data
Not spilling — flagged before STW
→
11 Jul, 12:40
24m
—
No rain data
Not spilling — flagged before STW
→
10 Jul, 07:12
42m
—
No rain data
Not spilling — flagged before STW
→
10 Jul, 03:48
1h 8m
—
No rain data
Not spilling — flagged before STW
→
10 Jul, 02:24
48m
—
No rain data
Not spilling — flagged before STW
→
5 Jul, 20:38
40m
—
No rain data
Not spilling — flagged before STW
→
5 Jul, 18:18
2h 20m
—
No rain data
Not spilling — flagged before STW
→
5 Jul, 17:26
32m
—
No rain data
Not spilling — flagged before STW
→
4 Jul, 11:24
1h 22m
—
No rain data
Not spilling — flagged before STW
→
4 Jul, 09:12
52m
—
No rain data
Not spilling — flagged before STW
→
4 Jul, 02:30
18m
—
No rain data
Not spilling — flagged before STW
→
3 Jul, 09:12
38m
—
No rain data
Not spilling — flagged before STW
→
2 Jul, 23:18
22m
—
No rain data
Not spilling — flagged before STW
→
28 Jun, 06:50
5h 14m
—
No rain data
Not spilling — flagged before STW
→
28 Jun, 05:34
1h 16m
—
No rain data
Not spilling — flagged before STW
→
28 Jun, 04:44
42m
—
No rain data
Not spilling — flagged before STW
→
28 Jun, 04:04
40m
—
No rain data
Not spilling — flagged before STW
→
28 Jun, 03:30
34m
—
No rain data
Not spilling — flagged before STW
→
28 Jun, 02:52
38m
—
No rain data
Not spilling — flagged before STW
→
28 Jun, 02:32
20m
—
No rain data
Not spilling — flagged before STW
→
28 Jun, 01:08
1h 24m
—
No rain data
Not spilling — flagged before STW
→

Showing the last 80 events of 214 in 2021.

168 brief spills under 15 minutes in 2021

Excluded from the counts, classification and flags above — too short to weigh against rainfall, and often an operational blip rather than a genuine discharge. Listed here for completeness. How we know.

31 Dec, 20:18 · 2m31 Dec, 11:18 · 2m31 Dec, 10:30 · 4m31 Dec, 10:20 · 6m31 Dec, 10:12 · 4m31 Dec, 09:26 · 6m30 Dec, 10:06 · 8m30 Dec, 06:42 · 14m29 Dec, 20:26 · 8m29 Dec, 20:14 · 2m29 Dec, 07:22 · 4m29 Dec, 06:50 · 6m27 Dec, 19:20 · 4m27 Dec, 09:14 · 2m25 Dec, 23:34 · 2m25 Dec, 22:06 · 12m25 Dec, 20:34 · 10m25 Dec, 07:50 · 8m23 Dec, 08:50 · 6m1 Dec, 11:32 · 2m1 Dec, 02:42 · 6m26 Nov, 17:04 · 12m12 Nov, 04:46 · 4m6 Nov, 12:12 · 6m6 Nov, 08:50 · 4m5 Nov, 12:18 · 6m5 Nov, 10:04 · 8m4 Nov, 17:04 · 4m4 Nov, 09:10 · 4m30 Oct, 05:40 · 2m29 Oct, 04:28 · 4m28 Oct, 15:14 · 4m28 Oct, 14:12 · 12m25 Oct, 13:56 · 10m20 Oct, 22:38 · 6m20 Oct, 20:18 · 8m20 Oct, 05:12 · 12m19 Oct, 20:20 · 10m19 Oct, 20:02 · 10m19 Oct, 03:06 · 2m+128 more