HORIZON-MISS-2026-03-OCEAN-02: Addressing aquatic pollution and biodiversity loss through nature positive solutions from source to sea

HORIZON-MISS-2026-03-OCEAN-02: Addressing aquatic pollution and biodiversity loss through nature positive solutions from source to sea

Key details

What this opportunity is and what it actually funds

This is a mission-topic opportunity under Horizon Europe’s Mission: Restore our Ocean and Waters umbrella. It is not a generic research grant that anyone can apply to with an arbitrary proposal. The call is highly specific: it asks for practical, nature-positive solutions that address aquatic pollution and biodiversity loss from the source end of the system all the way to the sea.

The call summary states expected outcomes around four policy-linked goals:

• Helping Member States and associated countries use cost-effective solutions aligned with EU water and marine directives and zero-pollution strategy objectives.
• Providing public and private actors with practical models for reducing nutrient, chemical, plastic, and microplastic pollution while restoring ecosystem functions.
• Achieving measurable progress in mission targets through place-based and people-centred actions.
• Mobilizing additional investment for implementation and scaling.

What this means for applicants is that this call is not about producing a single tool or a one-off publication. It is about building coordinated, field-level interventions that combine governance, demonstration, and measurable ecological outcomes. If your concept reads like a lab prototype detached from authorities and territory, it is unlikely to fit the current framing.

The call specifically links funding to mission objectives and a basin-scale logic rather than a dispersed set of disconnected pilots. The phrase “from source to sea” is not stylistic wording. It means projects are expected to understand and intervene across the whole chain where pollution originates, travels, accumulates, and ultimately impacts biodiversity.

A practical read of the call indicates that teams should propose solutions that work across sectors: wastewater interfaces, agricultural runoff management, urban water systems, and coastal/nature interfaces that can be measured and replicated.

Why this fits the 2026/2027 planning cycle

Publication in early February 2026 and an explicit deadline in late September 2026 puts this squarely in the 2026 application planning window for teams targeting 2026–2027 implementation activity. The call is marked as open, with funding tied to Horizon’s 2026–2027 mission context.

This timing gives a realistic window for teams that can finish concept development in the first half of 2026. But note that mission calls generally have demanding coordination demands. A technically solid project idea will lose strength if governance, partner commitments, and data architecture are not prepared early.

Even though this one is already in open state, practical readiness usually takes longer than expected because many tasks are done outside the narrative:

• Confirming partner roles in municipalities, agencies, and socio-economic stakeholders.
• Setting up legal and financial readiness for Horizon project participation.
• Building baseline data protocols.
• Designing a monitoring and reporting approach that can produce measurable ecological and biodiversity outcomes.

If you are planning a 2027 project cycle, this is one of the better opportunities to prep in advance because the mission model favors mature, implementation-ready applicants rather than late-stage “write-and-submit” teams.

What the funding is intended to support (and what it is not)

From the call text, the opportunity is intended to fund solutions that can be demonstrated in context and scaled through mission-aligned implementation systems.

It is intended to support:

• Nature-based and nature-positive interventions in connected freshwater-to-sea systems.
• Demonstrations involving public authorities and socio-economic stakeholders.
• Monitoring frameworks measuring pollution reduction and biodiversity response.
• Economic and social viability assessment for scaling.

It is not intended to be:

• A subsidy for generic environmental hardware purchases without implementation logic.
• A grant for purely academic studies not linked to demonstrable on-the-ground outcomes.
• A “top-down” pilot with no stakeholder governance and no transfer pathway.

The page explicitly asks for practical demonstration activity in multiple sites and highlights the need to test and upscale integrated approaches, which should shape your project architecture. This is very different from classic one-site R&D calls that are primarily laboratory or software development oriented.

Eligibility and participation expectations

The page references General Annex B for legal and financial conditions, so most formal eligibility language is inherited from the Horizon framework. The practical interpretation for this call is:

• Applications are for eligible Horizon Europe participants that match the countries associated with this topic entry.
• Teams should be prepared to handle Horizon Europe grant conditions, reporting obligations, and procurement/compliance requirements.
• If your project uses satellite-based Earth observation, positioning, navigation, and timing data, Copernicus and/or Galileo/EGNOS must be used; additional data can be used as needed.
• Public/private partnerships and local authorities are central, not peripheral.

Teams often fail early by assuming “eligibility” is limited to a single criterion or by focusing only on technical innovation. In mission topics, institutional readiness matters as much as technical readiness.

Who is a strong fit

• Regional authorities, public agencies, basin organisations, and entities already working with water or biodiversity policy execution.
• Research or innovation groups able to co-design interventions with local institutions.
• SMEs and service organisations that can contribute practical systems components, especially around restoration, treatment, monitoring, digital tools, or ecosystem services modelling.
• Organisations that can design solutions in at least several connected ecosystems, with clearly defined roles across sites.

Who should reassess before applying

• Teams proposing isolated pilots with no basin-level integration.
• Organisations that cannot commit to local implementation support beyond writing and reporting.
• Applicants unable to define a measurable monitoring framework before submission.
• Labs with only a scientific output model and no operational governance pathway.

Application route and what you should do before opening the portal

The official call page indicates this is a Horizon opportunity and directs applicants toward the EU Funding & Tenders infrastructure for submission. The mission page provides the topic details, outcomes, and strategic framing, while the submission mechanics are typically anchored in the portal.

For this call, practical steps before submission should include:

1. Pull the exact portal entry and confirm the action type, expected documents, and submission fields (this is usually where final form details are enforced).
2. Map consortium responsibilities for site selection, deployment, monitoring, finance, and knowledge transfer.
3. Draft a simple “outcome logic map” from input → intervention → measurable pollution/biodiversity indicator → socio-economic outcome.
4. Prepare partner MOUs and letters indicating willingness to participate in source-to-sea intervention and stakeholder mobilization.
5. Confirm data handling responsibilities, especially if using in-situ sensing or EO data layers.
6. Build a budget model that aligns expected costs with Horizon-style budgeting and includes administration, reporting, and partnership coordination.

Because the call is open and mission-scoped, preparation quality can materially improve your chance relative to teams that only begin after the portal goes live. In these calls, the most expensive mistake is not lack of idea quality, but under-preparation of partner and governance architecture.

Project design guidance for this specific call

1) Build a basin strategy, not a scattered portfolio

The call language repeatedly emphasises connected systems and basin-scale relevance. Your concept should target one Mission basin lighthouse first and then build linked demonstration sites there. A coherent basin narrative beats a broad grab of unrelated sites.

Structure your application around one basin story:

• Why these sites are connected in pollution transport.
• Which institutions govern each segment of the chain.
• How interventions in each site influence downstream outcomes.
• Why your set of interventions is scalable and transferable.

2) Anchor the intervention in public authority workflows

This opportunity is intended to involve public and private actors, including authorities. That means your intervention should be embedded in existing decision and implementation channels.

A strong proposal should show:

• Which authority level owns data, approvals, and follow-up.
• How your intervention fits local planning or river-basin governance frameworks.
• How results will be transferred to routine practice after project support ends.

3) Prioritize measurable ecological outcomes

Generic environmental claims are weak. Use clear metrics tied to the outcomes language in the call:

• Reduction or removal rates for pollutants (nutrients, chemicals, plastics, microplastics).
• Changes in retention and ecosystem recovery indicators.
• Biodiversity and habitat response.
• Climate resilience performance and social acceptance where applicable.

A good monitoring architecture should include baseline, intermediate, and endline assessment points. If you can show before-after comparability, you are already ahead.

4) Make economic viability explicit

The call text expects practical, scalable models with implementation potential. “Innovation value” in mission context usually loses strength if there is no viable continuation mechanism.

You should include:

• Who pays for ongoing operations.
• How local institutions sustain activities after initial support.
• How your solution interfaces with existing funding streams (structural funds, climate funds, local budgets, or private contributions where relevant).

5) Use data as infrastructure, not decoration

If you deploy in-situ marine/surface observations, the call references Copernicus and Galileo/EGNOS obligations where relevant. This indicates a high standard for reproducibility and interoperability.

Plan your data pipeline with:

• Data ownership and consent.
• Metadata standards and FAIR principles.
• Versioned monitoring outputs.
• Open or sharing obligations required by your data method.

Teams that treat data as a final report appendix usually have weaker compliance credibility than teams that build data governance into the intervention design.

Common mistakes in this mission call

Treating this as pure R&D

This is a deployment-focused topic, so purely technical research without implementation pathways is a weak match.

Ignoring partner co-ownership

The “public authorities and socio-economic actors” emphasis is central. Submitting a single-institution proposal with minimal local integration is often rejected as underfit.

Under-specifying demonstration logic

The call description highlights multi-site demonstration with clear practical value. If your project has weak justification for each site and no transfer logic, you will struggle.

Vague monitoring plans

Many applications describe good intentions but leave indicators undefined. Reviewers expect credible measurement tied to ecosystem outcomes, removal rates, retention, and ecosystem services.

Incomplete Horizon compliance preparation

Horizon administrative compliance is a major operational layer. Teams often underestimate required legal and financial preparations, which can delay submission quality or reduce technical focus in review.

Eligibility and technical checklist before draft submission

Use this checklist before you write the final version:

1. Confirm participant legal status and ability to be a Horizon beneficiary.
2. Build a clear governance matrix for coordinator, lead authority, and implementation partners.
3. Define 3–4 intervention sites with rationale, data readiness, and stakeholder permissions.
4. Draft a measurable outcomes matrix with a baseline and method per indicator.
5. Include a continuity and scaling plan beyond the project period.
6. Prepare communication and knowledge transfer outputs for mission impact.
7. Validate assumptions against call language for nature-positive outcomes and pollution reduction categories.
8. Verify the submission route in EU Funding & Tenders for exact file and form requirements.

Timeline strategy through September 2026

A practical timeline can be built backward from the submission deadline:

• March–April 2026: finalize basin choice, partner commitments, and high-level architecture.
• May–June 2026: develop intervention concept and monitoring architecture.
• July 2026: run internal compliance review for Horizon documentation.
• August 2026: produce full draft, including letters of intent and budget tables.
• Early September 2026: conduct a final technical and compliance review.
• Late September 2026: submit in the portal well before closing.

This schedule is intentionally conservative. Mission calls often penalize teams that compress late-stage edits and partner alignment into the final week.

Application process, documents, and review focus

Publicly listed details include submission and publication dates, action type, topic budget, and outcomes. The submission platform is the EU Funding & Tenders route, which normally requires compliance-heavy files (forms, budget tables, partner legal identifiers, annex declarations) in addition to the narrative.

In practice, reviewers commonly evaluate:

• Strategic relevance to Mission Ocean and Waters outcomes.
• Feasibility of implementation across connected systems.
• Strength and realism of governance and stakeholder participation.
• Monitoring quality and clarity of ecological impact.
• Scalability and replication potential.

Because the topic is mission-oriented, proposals that read as fragmented technical projects often perform worse than those with strong systems thinking.

Frequently asked questions

Is this opportunity recurring?

This entry is part of the 2026 mission call wave and is tied to the Horizon Europe 2026–2027 work context. It should be treated as a live 2026 submission rather than a permanently open recurring program. Watch associated mission pages for 2027 follow-ups or related topics in the same cluster.

Can individuals apply?

The opportunity is structured for organisations and consortia and is not framed as a solo-fellowship or individual grant. Individual researchers should apply as part of a qualified organisational applicant with clear partnership roles.

Is there an EU-level funding cap per project?

The published topic-level numbers are visible as a total of EUR 31.00 million and an estimated contribution range of EUR 7.00–7.75 million. Per-project requested amounts are not fixed in the call summary itself, so proposals should remain consistent with typical Horizon project budget rules and the action type.

Is there a second-stage deadline?

Some calls in this area include staged evaluation windows. This topic page does not list a second-stage date in the captured metadata. Treat staged timing as not confirmed unless the portal entry clarifies it for your specific call cycle.

Which countries can apply?

The call lists a wide set of eligible countries and basins on the topic page. Teams should confirm beneficiary eligibility against your own country’s standing in the relevant Horizon Europe action context.

Official links and next best steps

For current call data and updates, use these official sources:

• Primary call page (authoritative description, deadlines, outcomes, budget context): https://projects.research-and-innovation.ec.europa.eu/en/funding/funding-opportunities/funding-programmes-and-open-calls/horizon-europe/eu-missions-horizon-europe/restore-our-ocean-and-waters/horizon-miss-2026-03-ocean-02-addressing-aquatic-pollution-and-biodiversity-loss-through-nature
• Funding and Tenders Portal: https://ec.europa.eu/info/funding-tenders/opportunities/portal/screen/home
• Horizon Europe Online Manual: https://ec.europa.eu/info/funding-tenders/opportunities/guide/
• Funding portal FAQ and mission help pages linked from the official call entry

If this aligns with your institution’s marine, freshwater, or biodiversity priorities, the immediate action is to convert your basin-level concept into a submission-ready consortium package now, not at the deadline month.