
The Oslofjord is currently facing a severe ecological crisis after decades of intensive human use. Despite earlier improvements in reducing industrial pollution and sewage discharges, the fjord continues to suffer from eutrophication, declining fish stocks, biodiversity loss, and reduced public access to coastal areas. Climate change further intensifies these pressures through rising water temperatures, heavier rainfall, and increased nutrient runoff.
The case study focuses on how governance systems can better address these interconnected land-sea challenges across the entire fjord catchment.
Lead Gunnar Sander:
“We thought it would be an interesting case to see what happens in governance when a national government intervenes in what otherwise would be considered local issues.”
Problem statement
The main challenge in the Oslofjord is not only environmental degradation, but also fragmented governance. Existing River Basin Management Plans under the Water Framework Directive are too limited in scope, focusing mainly on pollution while failing to fully integrate fisheries, land-use planning, recreation, and biodiversity protection. Multiple sectors—agriculture, wastewater, fisheries, transport, and coastal development—create cumulative pressures, but responsibilities remain divided across institutions and governance levels. This makes coordinated action difficult and slows the transition toward effective ecosystem-based management.
Impact
The Oslofjord case demonstrates how ecological restoration depends on governance innovation as much as on technical measures. The 2021 Oslofjord Action Plan created a new cross-sectoral governance layer that includes 118 municipalities and introduces stronger coordination through the Oslofjord Council. This has increased political attention, improved cooperation between sectors, and strengthened recognition of land-sea interactions. At the same time, challenges remain around stakeholder participation, funding, climate adaptation, and the need for clearer measurable goals. The case shows that long-term recovery requires both institutional reform and sustained public support.





Workshops
Workshop 1
Stakeholder insights on existing barriers
Workshop 2
Governance and Scenario Development for Coastal Restoration
Workshop 3
Oslofjord Action Plan and Future Governance Pathways
Oslofjord - Workshop 1
Workshop 1 (WS1) was the first stakeholder dialogue within the Blue Green Governance (BGG) case study for the Oslofjord. The fjord is facing a severe ecological crisis despite decades of environmental management efforts. Problems such as eutrophication, biodiversity loss, declining fish populations, pollution, and reduced public access to coastal areas are intensified by climate change and fragmented governance.
Participants
The workshop brought together stakeholders from municipalities, regional authorities, NGOs, interest organizations, and researchers to identify the main environmental pressures, governance barriers, and opportunities for stronger integrated coastal governance.
Focus
The workshop focused on understanding how environmental degradation is linked to governance failures, and how the Oslofjord Action Plan could support a more coordinated long-term response.
Main climate and environmental pressures
Main pressures
- Stakeholders identified eutrophication as one of the most urgent problems: visible through algae blooms, turf algae, oxygen depletion, and “dead zones” and strongly linked to diffuse agricultural runoff and wastewater discharges.
- Regarding climate change, participants ranked: intense rainfall events as the most important climate pressure, due to sewage overflow and nutrient runoff
- Rising water temperatures as a major driver of algae growth, oxygen depletion, and species shifts.
Other pressures
- Collapse of cod and other demersal fish populations
- Pollution and contamination of fish in the inner fjord
- Loss of biodiversity and spread of invasive species such as Pacific oyster
- Coastal habitat destruction caused by housing, industry, cabins, and infrastructure development.
Contributing sectors
- Agriculture and forestry: Diffuse nutrient runoff was ranked as the most important current and future human pressure
- Wastewater and sewage: Municipal treatment plants and leaking sewer systems remain major pollution sources. Upgrading infrastructure is expensive and slow.
- Land-use planning: Municipal decisions on housing and coastal development strongly affect habitat loss and public access.
- Fisheries: Historical overfishing and continued pressure on marine ecosystems remain significant
- Transport and infrastructure: New roads, tunnels, harbour expansion, and dumping of stone masses damage seabed habitats.
- Participants also noted missing issues in current policy discussions, including recreational pressure, river habitat degradation, and microplastics from car tires.
Main governance challenges
The workshop concluded that the Oslofjord crisis is fundamentally a governance crisis. Main governance barriers include:
- River Basin Management Plans (RBMPs) focus too much on individual water bodies instead of the full catchment area
- Limited authority to enforce remedial actions
- Weak integration of marine ecosystems and fisheries into water governance
- Fragmentation between freshwater, coastal, and marine management
- Poor coordination between municipal, regional, and national governance levels
Issues such as recreation, coastal access, and shoreline development are addressed separately through spatial planning, creating further institutional fragmentation.
Key vulnerabilities, conflicts, and synergies
Key vulnerability dimensions
- Environmental vulnerability. Considered important or vital by all participants, with a strong focus on ecosystem services, fisheries, biodiversity, and recreational access.
- Societal security and health. Concerns about bathing water quality, food safety, climate risks, and mental well-being linked to nature.
- Social and economic dimensions.Importance of tourism, commercial fisheries, and social use of the fjord for communities and families.
Main conflicts
- Transport infrastructure vs. environmental protection.
- Coastal development vs. habitat conservation.
- Increased food production vs. water quality.
Potential synergies
- Low-trophic aquaculture to reduce nutrient loads.
- Nature-based solutions (NBS) for climate adaptation and ecosystem restoration.
Improving governance by participation, science, and foresight
Participation
Formal participation exists, but meaningful involvement varies. The Oslofjord Action Plan started with broad stakeholder consultation. Ongoing participation through the Oslofjord Council remains limited, especially for inland municipalities, NGOs, and industry actors.
Scientific knowledge
Scientific knowledge is unevenly used. No integrated fjord-wide scientific advisory system exists. No cumulative impact assessment or cost-benefit analysis was conducted for the Oslofjord Plan.
Strategic foresight
Strategic foresight is weak: The Oslofjord Plan mainly addresses current pressures. Future climate impacts are insufficiently assessed.
Digital tools
Digital governance tools are underdeveloped. Environmental data exist, but systems are fragmented and difficult to use.
Oslofjord - Workshop 2
Governance and Scenario Development for Coastal Restoration
Background and Context
The Oslofjord, Norway’s most heavily used coastal area, faces an ecological crisis after centuries of intensive exploitation. The fjord exhibits severe eutrophication, significantly depleted fish stocks, and degraded benthic habitats from shoreline construction. Climate change is amplifying these threats. In response, the Norwegian government introduced an ambitious action plan in 2021 following a unanimous parliamentary resolution, aiming to create a “clean, rich and accessible fjord.”
The Oslofjord Plan functions as an additional governance layer that supplements, coordinates, and reinforces existing arrangements, particularly river-basin management plans under the EU Water Framework Directive. It represents a unique Norwegian policy experiment in ecosystem-based coastal management, involving government agencies and 118 municipalities across the vast catchment area. A multi-level Oslofjord Council supports implementation.
Recent Developments
A significant milestone occurred in mid-2025 when the government introduced strict fisheries regulations, including a 10-year moratorium banning all commercial and leisure fishing in three large no-take zones, effective January 2026. While environmental organisations welcomed this decision, fishing industry stakeholders strongly criticized it.
The research team from the Norwegian Institute for Water Research (NIVA), working within the BlueGreen Governance (BGG) project, published a scientific article assessing whether the Oslofjord Plan has initiated transformative change. The article concluded that the Plan’s layered approach positions it within an inherently gradual change trajectory and does not address several institutional barriers limiting its transformative potential. The team was subsequently invited to present findings to the Oslofjord Council and prepare a policy brief for the upcoming revision of the Plan. A revised Oslofjord Plan is expected to be presented in May 2026 for public consultation, with final adoption anticipated in October.
Scenario Development Approach
Given the project’s focus on land-sea interactions, the second workshop concentrated on measures related to agriculture and wastewater—two sectors contributing significantly to nutrient discharges. Agriculture accounts for 47% of bio-available nitrogen entering the fjord, while wastewater contributes 25%.
Three scenarios were developed through sector-specific stakeholder workshops:
- Scenario 1 (Business-as-Usual) examined ongoing implementation of existing Oslofjord Plan measures, assessing their effectiveness in reducing runoff and identifying key institutional barriers and enablers.
- Scenario 2 (Policy-Driven) envisioned a future where the Plan’s objectives are achieved, recognizing that current measures are insufficient, particularly when considering climate change impacts.
- Scenario 3 (Compromise) explored structural changes necessary to achieve substantial additional nutrient reduction while remaining compatible with sector capacities and objectives.
Findings
Agricultural Sector Findings
Key measures under the current Plan include strict regional regulations on autumn ploughing, revised fertiliser regulations, buffer zone requirements, and targeted environmental subsidies. Participants identified several barriers: autumn ploughing restrictions increase spring workload and potentially reduce yields; new fertiliser rules focus primarily on phosphorus despite nitrogen being the main coastal problem; and buffer zone restoration faces complex regulatory obstacles.
Approximately 70% of workshop participants expected only slight runoff reduction by 2040 under current measures, with climate change—particularly increased rainfall—likely to offset much of the progress. Stakeholders emphasized a fundamental conflict: additional measures aimed at reducing runoff often conflict with the national objective of increasing food self-sufficiency.
Wastewater Sector Findings
The wastewater sector has made considerable progress since the 1960s, but the 600,000 additional inhabitants added to the catchment since 2000 have increased discharges. Current measures address dispersed settlements, sewer network upgrades, sand trap cleaning, and increased supervision.
When asked about discharge evolution by 2040 under current frameworks, all participants estimated only slight reduction. Major concerns included the distribution of costs (upgrades financed through resident fees), shortage of planning expertise, and climate change impacts—particularly how increased winter melt reduces biological nitrogen removal efficiency and how intense rainfall causes overflow of untreated sewage.
Vulnerability and Capacity Assessment
The workshops revealed multi-dimensional vulnerabilities across several categories:
- Economic concerns centered on uncertainty about costs and burden distribution, with farmers facing increased expenses while being encouraged to boost production, and municipalities dealing with budget constraints
- Political agency and legitimacy issues emerged around frustration with regulations, dual advisory-supervisory roles of municipalities creating trust problems, and the mismatch between long-term infrastructure investment needs and four-year electoral cycles
- Social belonging concerns included fear of “failing as a society” to protect the fjord, while others worried that strict regulations reduce opportunities for shared activities like fishing
- Human security considerations included potential impacts on farmers’ mental health if farming becomes economically unviable, and food security implications.
Proposed Compromise Solutions
Agriculture
For agriculture, stakeholders suggested subsidies targeted toward sustainable practices rather than just loss compensation, taxes on mineral nitrogen fertilisers, reduced food waste, regulatory frameworks promoting circular practices, and technology like nitrogen sensors and regenerative farming.
Wastewater
For wastewater, recommendations included grants covering investments (not just planning), “green loans” to municipalities, cost-sharing across municipalities, solutions suited for Nordic conditions, and potentially transforming wastewater management from municipal to national responsibility.
Broader Implications
The case study highlights critical governance challenges at the land-sea interface. Stakeholders emphasized the need for more effective decision-support tools to determine required sectoral reductions. The work underscores the importance of participatory processes, with the research team’s contributions leading to a more inclusive approach in the Plan revision. Key recommendations include establishing the Oslofjord Plan as a regularly revised long-term instrument, systematic monitoring and evaluation, and strategic adaptation to changing circumstances—treating the Plan as an experiment requiring continuous learning.
Main Conclusions
The Oslofjord Plan is viewed as an important experiment in integrated coastal governance, but current measures alone are not enough to restore the fjord. Structural barriers within governance systems limit transformative change.
The stakeholders have highlighted the need for:
- stronger stakeholder participation,
- better scientific and decision-support tools,
- integrated land-sea governance,
- continuous monitoring,
- and long-term adaptive policy planning.
Overall, the stakeholders have concluded that restoring the Oslofjord requires both environmental ambition and socially acceptable solutions that balance ecological, economic, and political interests.
Oslofjord - Workshop 3
The final workshop focused on evaluating the Oslofjord Action Plan as a governance innovation and exploring how it could support stronger integrated land-sea management in the future. Discussions centered on participation, scientific knowledge, strategic foresight, and institutional reform.
1. Evaluation of the Oslofjord Action Plan
Participants analysed how the 2021 Action Plan adds a new governance layer by coordinating sectors rather than replacing existing institutions, using the concept of institutional layering.
2. Assessment of participation practices
Formal participation requirements are generally met, but participants noted that meaningful involvement remains uneven, especially for NGOs, inland municipalities, and private sector actors.
3. Review of science-policy integration
Stakeholders highlighted the lack of a unified fjord-wide scientific advisory system and the need for stronger cumulative impact assessments and clearer decision-support tools.
4. Strategic foresight and climate adaptation
Participants stressed that climate change remains underrepresented in the official Action Plan and that future governance must include stronger long-term scenario planning and monitoring.
5. Recommendations for integrated governance
The workshop concluded that better data accessibility, stronger stakeholder inclusion, measurable environmental targets, and long-term political commitment are essential for restoring the Oslofjord and building lasting blue-green governance.





