Bourne STW

Storm overflow operated by Anglian Water. The source names Bourne Eau + Black Sluice Dyke as the receiving water.

31
Spills in 2025: 211.6
Recorded hours: 98.7%
Monitor operation: 5
Years listed

The reported spill count was 33 lower than in 2024. This compares event counts, not discharge volume.

Current status unknown

Checking the latest monitor report…

How it compares in 2025

Bourne STW recorded 31 spills in 2025. That is more than 75% of the 14,239 overflows in England with a reported figure, and ranks 3,344th nationally. Among Anglian Water overflows it ranks 144th of 1,438; the median Anglian Water overflow recorded 6 spills. On the Black Sluice IDB draining to the South Forty Foot Drain waterbody it ranks 2nd of 11.

Group	Rank by spills	Median spills	Median hours
This outlet	–	31	211.6
England	3,344th of 14,239	11	22.3
Anglian Water	144th of 1,438	6	13.5
Black Sluice IDB draining to the South Forty Foot Drain	2nd of 11	12	66

Rank 1 has the most spills. Equal counts share a rank. Only overflows with a reported count are ranked. Counts do not measure volume, so a higher rank does not mean more sewage.

Annual spill history

From 2021 to 2025, the reported count went from 14 to 31 spills. The highest count was 64 in 2024 and the lowest was 14 in 2021. The monitor worked for less than 90% of 2021, so that count may be low.Amber bars mark years when the monitor worked for less than 90% of the year.

Year	Spills	Duration	Monitor operation	Source
2025	31	211.6 hours	98.7%	Official data
2024	64	696.5 hours	92.5%	Official data
2023	18	83.2 hours	100%	Official data
2022	22	137.8 hours	100%	Official data
2021	14	273.5 hours	82.8%Low coverage	Official data

A missing figure means the source did not provide a usable value. A zero is shown as zero. Monitor operation below 90% can make comparison less reliable.

Outlet details

Water company: Anglian Water
Outlet type: Storm tank at a wastewater treatment works
Permit: ANNNF1573
Activity reference: A2
Grid reference: TF1097320004
Waterbody ID: GB205030051515Official waterbody record ↗
Location source: Official annual grid reference
Location precision: About 1 metres
Location note: Unknown

About the name and type

The annual return lists this asset as “Storm tank at WwTW”: storm tank at a wastewater treatment works. The overflow comes from storm storage at a treatment works.

The waterbody link opens the Environment Agency record for the exact ID in the return. It is a source lookup; we do not import its classification.

Where it is

The recorded position is about 1.2 km east of the Bourne reference point in the ONS built-up areas data.

Area and water pages

Black Sluice IDB draining to the South Forty Foot Drain waterbody →

Check the official record

Public access to this outlet is unknown. Do not enter restricted land or use this page as a route guide.

Open official source ↗

Other outlet records nearby

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Anglian Water · Bourne Eau + Black Sluice Dyke
Current status unknown

Dyke-Village St Sp
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Current status unknown
West Deeping - Mh951 SSO
Anglian Water · River Welland
Current status unknown
Deeping Water Recycling Centre
Anglian Water · River Welland
Current status unknown

Questions about Bourne STW

Who operates Bourne STW?: Anglian Water is the operator named in the annual record. The permit reference is ANNNF1573.
Where does Bourne STW discharge?: The source names Bourne Eau + Black Sluice Dyke as the receiving water. This does not show how far a discharge travelled.
How many times did Bourne STW spill in 2025?: The 2025 return records 31 counted spill events and 211.6 hours of recorded discharge. Spills are counted with the 12/24-hour method, so this is not a count of every start signal.
Can I trust the 2025 figures for this outlet?: The monitor worked for 98.7% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
Is Bourne STW discharging right now?: This record is linked to a company live feed. The panel above shows the latest report we hold, with its date. That report can be old, and the monitor can be offline, so check the date before relying on it. A report that no discharge is taking place is not a water-quality result.
How accurate is the map marker?: The marker comes from the grid reference in the official annual return, which is accurate to about 1 metres. It shows the recorded outlet position, not the extent of any discharge.
What kind of outlet is Bourne STW?: The annual return lists the asset type as “Storm tank at WwTW”, which means storm tank at a wastewater treatment works. The overflow comes from storm storage at a treatment works.
How does Bourne STW compare with other overflows?: Bourne STW recorded 31 spills in 2025. That is more than 75% of the 14,239 overflows in England with a reported figure, and ranks 3,344th nationally. Among Anglian Water overflows it ranks 144th of 1,438; the median Anglian Water overflow recorded 6 spills. On the Black Sluice IDB draining to the South Forty Foot Drain waterbody it ranks 2nd of 11. Ranks compare counted spill events only. They do not compare volume or harm.
Does zero spills mean the water was safe?: No. A zero means the annual return recorded zero counted spill events for this outlet and year. It is not a water-quality test, and pollution can come from other sources.