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Portrack Sewage Treatment Works: sewage overflow history (NWL01050)

Review available Environment Agency annual monitoring returns for Portrack Sewage Treatment Works. Compare reported spill counts, total duration and monitor operation by year, with source details and gaps in the series identified.

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Annual monitoring returns

2020

2021

2022

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	58	273.17	99.91
2024	76	400.75	99.88
2023	94	416.68	99.98
2022	48	76.4	100
2021	35	44.48	87.28
2020	40	282.93	88.8

Published record details

Reference: NWL01050
Location: River Tees Estury
Coordinates: 54.56747, -1.27413
Watercourse: River Tees (Saline Estuary)
Sewerage company: Northumbrian Water
Asset type: Inlet SO at WwTW
Permit reference: 25/04/1657
Discharge grid reference: NZ4703019380
Reporting years: 2025, 2024, 2023, 2022, 2021, 2020
Catchment: River Tees Estury

Location

Portrack Sewage Treatment Works
54.56747, -1.27413

Understanding annual storm overflow figures

The Environment Agency's annual returns report storm overflow monitoring information supplied by water companies. Spill counts use the regulatory 12/24-hour block method, so a counted spill is not necessarily a single uninterrupted discharge. Duration is the reported total time in spill, rather than the volume of sewage discharged. Monitor operation indicates the percentage of the reporting period for which the monitor operated. Missing values, incomplete monitoring and changes in recorded outlet details can affect comparisons between years. These annual figures describe historical reporting periods, not live discharge conditions or the cause of sewage problems at an individual property.

Nearby records

Portrack Sewage Treatment Works0 km Middlesbrough Road Sps0.6 km A66 Rider Sewer CSO0.8 km Old River Tees Pumping Station0.8 km Stockton East CSO0.9 km

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