Water Resources Act and EA Guide
The Water Resources Act 1991 is the primary UK statute protecting controlled waters from pollution, and is enforced by the Environment Agency. It creates strict offences for the release of pollutants to surface or groundwater, and bund lining is one of the principal engineering controls operators rely on to stay on the right side of the Act.
Overview of the Water Resources Act and EA Guide
The Water Resources Act 1991 sits at the centre of UK water pollution law. Section 85 creates a strict-liability offence for polluting matter entering controlled waters, and prosecution requires no proof of intent. Section 161 gives the Environment Agency wide enforcement powers, including Anti-Pollution Works Notices and cost recovery. EA guidance (PPGs, OPRA and sector notes) underpins the framework, applying to bund lining and water pipe lining alike.
How the Water Resources Act and EA Guide Relates to Bund Design
The Water Resources Act and the Environment Agency’s enforcement framework carry direct implications for the way water bunds and chemical bunds are designed, lined and operated. We engineer every specification with the following in mind:
Strict liability for pollution events
The Act treats pollution as an offence regardless of intent, which is why bund integrity has to be evidenced rather than assumed.
Bund lining as a primary engineering control
The lining is one of the few measures that actively prevents a release from reaching controlled waters, and the Environment Agency assesses it on that basis.
110% capacity expectation
Drawn from EA guidance and routinely cited in enforcement notices, the 110% rule (or 25% of total stored volume, whichever is greater) is one of the first things an EA officer asks about during an inspection.
Impermeable construction
Bund walls and floors must form a continuous, impermeable barrier, evidenced through specification, application records and integrity testing.
Drainage controls
Drainage outlets must be valved, normally closed, and only opened under controlled conditions with confirmation that no oil or chemical is present.
Anti-Pollution Works Notice exposure
Where a bund is found to be inadequate, the Agency can require remedial work within defined timescales, with cost recovery if the operator does not act.
Polluter pays principle
The cost of any pollution clean-up falls on the operator under Section 161, even where the immediate cause was a defect in the bund itself.
Inspection regime evidence
Maintenance and integrity test records form the operator’s defence in the event of an investigation, and missing records are routinely treated as evidence of non-compliance.
Permit Conditions
Environmental permits issued under the EPR 2016 frequently incorporate specific bund integrity, capacity and inspection requirements that exceed the baseline framework.
Water Resources Act and EA Guide by Industry Sector
The Water Resources Act applies across every UK sector, with sector-specific emphasis on different controls:
Oil, Gas and Petrochemical
Oil bund prosecutions under the Act are among the most common in the EA’s published enforcement record, with bulk fuel terminals, depots and forecourts under particular scrutiny.
Chemical Processing
Environmental permits issued under EPR 2016 routinely set bund integrity and capacity expectations beyond the baseline, with the Water Resources Act offences sitting underneath.
Food & Beverage
Trade effluent discharge consents and CIP chemical handling fall under EA scrutiny, with brewery, dairy and food production losses frequently appearing in enforcement statistics.
Agriculture & Aquaculture
Sections of the Water Resources Act dealing with agricultural pollution apply directly, alongside the SSAFO Regulations and NVZ rules.
Sewage and Waste Water Treatment
Water company assets are owned and operated under a permitting regime that flows directly from the Act, with bund integrity central to every permit.
Power Generation and Transmission
Transformer oil pollution events feature in EA enforcement records, and the Act applies regardless of the asset’s wider electrical regulatory framework.
Nuclear Facilities
The Water Resources Act applies to non-radiological pollution at nuclear sites, alongside the radiological framework administered by ONR.
Related Regulations
The Water Resources Act and EA framework do not sit in isolation. The wider regulatory framework that shapes bund lining compliance includes:
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PPG Guides — Environment Agency Pollution Prevention Guidelines, which sit operationally underneath the Act and provide the practical benchmarks for capacity, drainage and integrity. -
UK Bund Design Requirements — the engineering framework drawn from CIRIA C736, BS EN 1992-3 and sector codes that EA inspectors cross-reference during compliance visits.
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COSHH and HSE Compliance — the workplace safety framework that runs alongside environmental regulation and shares many practical controls.
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Oil Storage Regulations (England, Scotland, Wales, Northern Ireland equivalents) — the statutory framework for above-ground oil storage, which sits beneath the Water Resources Act for oil-specific obligations.
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COMAH Regulations 2015 — major-hazard chemical site obligations enforced jointly by HSE and the Environment Agency, including containment integrity as a core safety control.
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Environmental Permitting Regulations 2016 — the modern permitting framework that runs alongside the Water Resources Act and governs site-specific operating conditions.
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The Anti-Pollution Works Regulations 1999 — the procedural framework for serving Anti-Pollution Works Notices under Section 161 of the Act.
Frequently Asked Questions
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Yes, the Section 85 offence is strict liability, meaning pollution does not have to be intentional or negligent for the Act to be breached. The operator’s defence rests on demonstrating that the bund and wider engineering controls were properly designed, maintained and inspected, which is why integrity records matter so much in practice.
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The Act applies to any storage that could result in pollution of controlled waters, regardless of whether the asset is permanent, temporary or mobile. Bunded skids, drum trays, IBC stands and temporary tanks all need to demonstrate the same level of containment performance as fixed assets, with the relevant PPG guidance (particularly PPG 26) often cited in support.
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Yes, both new and existing installations sit under the Act’s offences and enforcement framework, and grandfathering of older bunds is rare in UK practice. Existing bunds are expected to be brought up to current standards through planned refurbishment, especially when ownership changes, environmental permits are renewed or material changes are made to the asset.
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A fit-for-purpose bund is evidenced through a documented design (capacity, freeboard, detailing), a written lining specification matched to the chemistry, application records, holiday and hydrostatic test results, and an ongoing inspection log. We supply each of those as part of every project so the evidence pack is available on demand to a regulator, insurer or auditor.
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We design every bund to a layered specification that sits across the Water Resources Act, the EA’s PPG and sector guidance, the Oil Storage or SSAFO Regulations as applicable, COSHH and HSE workplace controls, and any sector-specific framework such as COMAH or BS 4247. The aim is a single coherent specification that satisfies every regulator without duplication.
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Specialist advice is worth seeking on any new build, major refurbishment, change of stored substance, post-incident review, environmental permit application or where the regulator has flagged a concern. We also recommend it whenever an existing water bund’s compliance position has not been formally reviewed in the last five years.
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EA officers typically check bund capacity against the largest stored vessel, look at the condition of walls, floors and detail areas, ask for inspection and integrity test records, and verify that drainage outlets are valved closed. They will also ask to see the substance compatibility documentation, and any failure to produce records on the day is generally treated as evidence of non-compliance.
Need Help With Compliance?
Talk to our team about specifying a bund lining system that meets your regulatory obligations.
