SWW + Anglian Water · Select a place & test date for linked analysis
A discharge from Southend-Ness Road CSO on the morning of 1 Apr directly coincides with the Medium Risk result at this site. While the spill duration was brief (1 minute), its proximity (3.65 km) and timing on the test day warrants further investigation into whether this or other CSO activity contributed to the elevated reading.
Three consecutive High Risk results (ERU 64–102) with no Anglian CSO activity in the pre-sample windows. Combined with no SWW discharges either, the contamination source at Southend-on-Sea remains unexplained by available sewage data.
The Norwich test date (4 May) falls outside the Anglian data window (data ends 30 Apr). 23 discharge events were recorded at nearby CSOs during April, but none fall within 5 days before the test date. A data gap means this result cannot be fully assessed.
Only one Anglian asset within 5 km (Cromer STW). Its single recorded discharge occurred 5 days after the test and cannot be linked. The High Risk result at Cromer remains unexplained by available sewage data.
20 CSOs within 5 km, none recorded a discharge in the 5 days prior to the 2 Apr test. The ERU of 133 — the second-highest in the entire dataset — remains unexplained by sewage data. Bulk of Southern Water activity at this location was Jan–Feb 2026.
Only 1 Southern Water asset within 5 km of Hove, and its single recorded discharge was in June — well after both test dates. Both Medium Risk results have no sewage discharge explanation in this dataset.
The nearest prior discharge (SRN0533, 27 Mar) falls 14 days before the test — outside the 5-day window. High Risk result at Saltdean is not explained by nearby Southern Water CSO activity in the analysis period.
Same two CSOs as Saltdean (SRN0533 and SRN0662 share coordinates). Most activity concentrated in Jan–Feb 2026. No Southern Water discharge in the 5-day window before this High Risk result.
None of the 6 nearby SWW CSOs discharged during the entire analysis period. Agricultural runoff or private drainage may be the contamination source.
None of the 5 nearby SWW CSOs discharged during the full analysis period. Non-CSO contamination pathways warrant investigation.
No CSO discharges in the 5-day pre-sample window. Only discharge in the period post-dates the sample.
All 9 nearby CSOs silent during the 5-day pre-sample window. Other discharges in dataset are from early-mid February.