Waddenzee — Case C-127/02
Waddenzee is a foundational Habitats case. It explains two different questions: when a proposal needs an appropriate assessment, and how certain the authority must be before allowing it to proceed.
The full case is Landelijke Vereniging tot Behoud van de Waddenzee and Nederlandse Vereniging tot Bescherming van Vogels v Staatssecretaris van Landbouw, Natuurbeheer en Visserij, EU:C:2004:482. It concerned mechanical cockle fishing, but the principles are important for development affecting protected habitats.
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- Neutral citation
- Case C-127/02; EU:C:2004:482
- Court
- Court of Justice of the European Communities (Grand Chamber)
- Judgment date
- 7th September 2004
- Judge
- V. Skouris, P. Jann, C.W.A. Timmermans, C. Gulmann, J.-P. Puissochet, J.N. Cunha Rodrigues, R. Schintgen, S. von Bahr and R. Silva de Lapuerta
- Case number
- C-127/02
An established activity can still need assessment
Nature conservation organisations challenged annual licences for mechanical cockle fishing in the Waddenzee Special Protection Area in the Netherlands. The activity had taken place for many years. That did not, by itself, put each new authorisation outside the assessment process.
The Court held that annual fishing licences, each involving a fresh assessment of whether and where fishing could occur, could concern a distinct plan or project. Long use is not automatically an exemption from the Habitats requirements.
The screening question is about a risk of significant effects
At paragraphs 39–49, the Court explained that an appropriate assessment is needed where significant effects cannot be excluded on the basis of objective information. The proposal must be considered alone and in combination with other plans or projects.
This is not a requirement to prove environmental damage before assessment begins. Significance is considered against the conservation objectives and particular characteristics of the protected site.
Where the available information leaves the relevant doubt, the answer is to carry out the assessment rather than assume that the proposal is harmless.
Authorisation requires a different conclusion
At paragraphs 52–61, the Court addressed the appropriate assessment and the decision which follows it. All aspects capable of affecting the site’s conservation objectives must be identified using the best scientific knowledge, including cumulative effects.
Under Article 6(3), the authority can agree to the proposal only after making certain that it will not adversely affect the integrity of the site. That means no reasonable scientific doubt remains about the absence of those adverse effects.
It is important not to merge the two stages. Screening asks whether significant effects can be excluded. The later decision asks whether the assessment establishes that site integrity will not be adversely affected.
Waddenzee is not an automatic ban on every uncertain proposal
The Court recognised the separate Article 6(4) route, subject to its own requirements. Failure to establish the necessary Article 6(3) conclusion is not permission to skip those requirements.
Nor does Waddenzee answer every later question about mitigation or the contents of an assessment. Read it alongside People Over Wind on screening and mitigation, and Holohan on the scope and quality of assessment.
Why the case remains important in domestic planning
The Supreme Court referred expressly to Waddenzee when explaining the precautionary approach in C G Fry & Son Ltd [2025] UKSC 35. That provides a domestic citation trail; it should not be confused with saying that every historical EU rule applies unchanged in every current case.
For a live proposal, identify the applicable legislation, the site’s designation and conservation objectives, the stage of the consent process, and the evidence available. Those details matter as much as the familiar phrase about scientific doubt.
Read the Waddenzee judgment
Gold Members can read the complete Court of Justice judgment held in Planning Geek’s protected case-law library.
Waddenzee Case Law Page Updated: 12th September 2026