Sewage Map

Southern Water sewage map and spill data

Southern Water operates 977 storm overflows listed in the 2025 England annual return, on 477 named receiving waters. Check the latest company report for each outlet below.

977
Outlet records
15,554
Spills in 2025
114,868
Recorded hours
891
Linked to a live feed

2 records have no usable spill count. 115 records show monitor operation below 90%. Annual figures describe the whole of 2025, not today. Company totals are not a league table.

Waters with the most Southern Water outlets

Receiving waters named in the annual return, with the number of this company’s outlets on each.

Official annual data ↗Southern Water glossary ↗Southern Water 2025 reportHow spills are countedReport pollution

Southern Water outlets

Filter by the latest company report, or search by outlet, receiving water, town or postcode. The map follows the filters.

Filters apply to the map and list. Recent stops need a current report and a recorded stop time. They do not show whether water is safe.

Showing 10 of 977 outlets

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Most recorded spills in 2025

The highest 2025 counts among Southern Water outlets. A count is events, not volume or harm. Equal counts share a rank.

  1. 1
    Lavant No.1 SSO - 115745

    River Lavant & GW via Wetland

    166spills
  2. 2
    Lidsey SSO - 115776

    Lidsey Rife

    157spills
  3. 3
    Ham Lane Lewes New SSO - 115974

    The Tidal River Ouse

    155spills
  4. 4
    Kings Somborne SSO - 115725

    Tributary of the River Test

    125spills
  5. 5
    Hammerwood Road Ashurst Wood SSO - 115955

    Shovelstrode Stream

    104spills

Spills over time

The median outlet run by Southern Water recorded 7 spills in 2025, against 11 across England.

794 outlets have a comparable count for both 2024 and 2025, with the monitor working at least 90% of each year. 100 recorded more spills, 595 fewer and 99 the same. Together they went from 27,326 to 14,244 spills, a fall of 48%.

Largest rises from 2024 to 2025

YearOutlets with a countTotal spillsMedian per outletEngland median
202597515,554711
202497129,3551419
202389127,6211720
202287515,5641013
202187517,6201019
2020439891318

Earlier returns list fewer of these outlets, so totals are not comparable between years. The median per outlet and the like-for-like change are fairer comparisons. Counts are events, not volume.

All Southern Water outlet records

977 outlet records in alphabetical order. Each link opens the outlet page with its latest report and annual history.

A36 outlets
B91 outlets
C92 outlets
D20 outlets
E33 outlets
F54 outlets
G38 outlets
H73 outlets
I7 outlets
J3 outlets
K15 outlets
L52 outlets
M66 outlets
N38 outlets
O15 outlets
P45 outlets
Q9 outlets
R36 outlets
S119 outlets
T51 outlets
U7 outlets
V9 outlets
W64 outlets
Y4 outlets

Sources and dates

Outlet locations, receiving waters and spill figures come from the Environment Agency 2025 event duration monitoring annual return for England. The latest reports come from the Southern Water live feed and carry their own dates.

All sourcesCoverage and gapsHow the data works

Questions about Southern Water

What do the Southern Water figures cover?
This page totals 975 outlet records with a usable 2025 spill count, out of 977 records in the England dataset. Missing values are not counted as zero.
How many Southern Water outlets are linked to a live feed?
891 records are matched to a monitor in the company live feed. A link does not mean the monitor is working now. Use the status filters above to see the latest report and its date. 86 records have annual figures only.
How many Southern Water outlets recorded zero spills in 2025?
175 records report zero counted spills. 115 records have monitor operation below 90%, so a zero from one of those outlets may not cover the whole year.
Does a recorded spill show how much sewage was discharged?
No. Event duration monitors report when an overflow operated. They do not measure the volume released or the water quality.
Can I compare Southern Water with another company?
Take care. 115 records have monitor operation below 90%, and companies differ in outlet numbers and area. Check missing values and monitor coverage before making a comparison.
How do I report pollution from a Southern Water outlet?
Use the official pollution reporting route in our guide. Give the outlet name, permit reference and the time you saw the problem. Sewage Map does not send incident reports.