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Controlled waters meaning

What does Controlled waters mean?
In legal practice, “controlled waters” describes the surface and groundwater bodies protected from pollution and regulated for discharges and permitting. In England and Wales the term is defined in section 104 of the Water Resources Act 1991 (as amended) and comprises four categories: territorial waters, coastal waters, inland freshwaters (rivers, lakes and watercourses) and groundwaters. It underpins offences and controls now largely operated through the Environmental Permitting (England and Wales) Regulations 2016 and guides incident reporting, clean-up and enforcement by the Environment Agency and Natural Resources Wales. In Scotland the modern regime regulates the “water environment” under the Water Environment and Water Services (Scotland) Act 2003 and the Controlled Activities Regulations; “controlled waters” is mainly a legacy expression but may appear in older statutes and case law. In Northern Ireland the Water (Northern Ireland) Order 1999 adopts the same four‑fold definition and is applied by the Northern Ireland Environment Agency. In Ireland the expression is not a statutory term; equivalent regulation refers to “waters” under the Local Government (Water Pollution) Acts and the Environmental Protection Agency Acts. The concept is practically significant for defining pollution offences, permitting scope and regulator jurisdiction.
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View the related Practice Notes about Controlled waters

PRACTICE NOTES
Water pollution liabilities and enforcement in England and Wales: offences, permitting, agricultural controls, nuisance claims, penalties and remediation, including corporate and officer liability

Water pollution Polluted water can kill fish and other aquatic life, harm habitats, threaten drinking supplies, lower water quality and foul beaches. Many kinds of contaminant can enter waters—chemicals, microplastics, petrol, oils and fats, ammonia in sewage, mine waste, nitrates from farming and solid waste. Definitions of water ‘Controlled waters’ Relevant territorial waters (seawater to three nautical miles) Coastal waters (eg tidal waters) Inland freshwaters (rivers, streams, watercourses, lakes and ponds) Groundwaters (water stored in rock layers beneath soil) Section 104 of the Water Resources Act 1991 (WRA 1991) ‘Surface water’ Inland waters (all standing or flowing surface water, except groundwater) Transitional waters (partly saline estuaries substantially influenced by freshwater flows) Coastal waters (water up to one mile seaward) The Water Environment (Water Framework Directive) (England and Wales) Regulations 2017, SI 2017/407, Sch 1 ‘Groundwater’ — all water below the ground surface...

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PRACTICE NOTES
England and Wales 2026 contamination, pollution and environmental permitting—legislation and consultations tracker (from 1 January 2026)

This tracker tool tracks and summarises key new legislation and consultations in England and Wales linked to contamination, pollution and environmental permitting. In England and Wales, the following regimes govern contamination, pollution and environmental permitting: Contaminated land regime under Part IIA of the Environmental Protection Act 1990 (EPA 1990): addresses land contamination that is causing, or where there is a significant possibility of causing, significant harm to human health (including property), living organisms, interference with ecological systems, or impacts on controlled waters. The Environmental Damage (Prevention and Remediation) (England) Regulations 2015, SI 2015/810, and the Environmental Damage (Prevention and Remediation) (Wales) Regulations 2009, SI 2009/995 (EDR): apply to environmental damage, defined as damage to: a protected species or natural habitat that has a significant adverse effect on achieving or maintaining the favourable conservation status of that species or habitat a site of special scientific interest (SSSI) where the integrity of the site is adversely affected surface water...

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PRACTICE NOTES
England and Wales 2025 environmental law tracker: contamination, pollution and permitting—legislation and consultations (Archived)

ARCHIVED This Practice Note has been archived and is no longer maintained. This tracker compiles and summarises key recent and forthcoming legislation and consultations in England and Wales connected to contamination, pollution and environmental permitting. In England and Wales, the following regimes relate to contamination, pollution and permitting: the contaminated land regime under Part IIA of the Environmental Protection Act 1990 (EPA 1990): this addresses contamination of land that is causing, or where there is a significant likelihood of causing, significant harm to human health (including property), living organisms, or interference with ecological systems, or to controlled waters the Environmental Damage (Prevention and Remediation) (England) Regulations 2015, SI 2015/810 and the Environmental Damage (Prevention and Remediation) (Wales) Regulations 2009, SI 2009/995 (EDR): these apply to environmental damage, defined as environmental damage to: a protected species or natural habitat that has a significant adverse effect on achieving or maintaining the favourable conservation status of that species or habitat a...

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