What is peatland due diligence?

Peatland due diligence is the independent verification of a peatland project's hydrology, restoration engineering, carbon accounting methodology, governance and long-term maintenance plan before an investor or corporate buyer commits capital. It differs meaningfully from due diligence for forestry or agroforestry projects: the asset that matters most — stored peat carbon — is invisible without site data, and it is governed by a water table that does not respect property boundaries.

Peatlands are easy to underestimate. They often lack the visual impact of a tropical forest teeming with brightly-colored biodiversity or the intuitive appeal of a large-scale tree planting initiative that involves hundreds of local landowners. Yet beneath their seemingly modest surface lies one of the world’s most important carbon stores.

Covering only roughly 3-4% of the Earth’s land surface [1], peatlands hold approximately 600 gigatons of carbon [2]- nearly one-third of global soil carbon. When they are drained, eroded or converted for forestry, agriculture or peat extraction, that stored carbon begins to oxidize and return to the atmosphere. Restoring peatlands can therefore deliver substantial climate benefits, but this relies on achieving harmony between hydrology, infrastructure and long-term management.

Xilva’s due diligence work spans more than 450 nature-based project assessments, and the peatland projects within that pipeline surface key issues that deserve particular attention. For investors and corporate buyers, peatland due diligence requires a slightly different mindset from forestry or other types of nature-based projects. Here, the most valuable asset is largely invisible, water doesn’t neatly align with property boundaries and poorly designed interventions may leave the site continuing to emit carbon unchecked.

Keep reading to uncover seven core areas in peatland projects that require a deeper dive into investor due diligence.

1. Look below the surface

In peatlands, the variables that matter most — peat depth and condition, water-table depth and drainage history — are invisible without site-level data. In forest projects, much of the carbon story is visible in trunks, branches, and canopy cover. In peatlands, these critical variables are underground or otherwise difficult to observe. A site may look wet yet still be degraded. Conversely, a recently rewetted site may remain visually unremarkable while already avoiding substantial emissions.

Due diligence should therefore test whether peat depth and condition have been surveyed at sufficient resolution, whether drainage channels and erosion features have been mapped, and whether water-table measurements capture seasonal variation. Baseline evidence should support the project’s eligibility and the assumptions used to estimate future emissions reductions.

2. Treat restoration as hydrological engineering

Peatland restoration functions more like infrastructure work than passive rewetting. It is not a simple matter of letting nature recover by just throwing water at it. Interventions may include blocking drains and gullies; installing peat, stone, coir or plastic dams; stabilizing bare surfaces; and removing trees to restore native vegetation. These measures are intended to slow water movement and retain sediment while also raising water levels and preventing further erosion.

Due to the invasive, technical nature of these interventions, the details are crucial. Drain-blocking may fail if they are incorrectly spaced or constructed. Reprofiled slopes may continue to erode if angles are unsuitable. Revegetation may falter where brash is poor quality, seed is not viable or grazing pressure remains high.

Investors should request feasibility studies and intervention designs, and once construction is complete, an independent ‘as-built’ report confirming that works were delivered as designed.

3. Assess the project as a landscape mosaic

Because water crosses property lines, hydrological connectivity — not just the project boundary — is one of the defining risks in peatland due diligence. . Drainage on neighboring land can lower water tables within the project area, while rewetting may affect adjacent agricultural areas, roads, forestry plantations, or private properties. 

Due diligence should examine the project’s wider catchment area, neighboring land uses, upstream and downstream drainage systems, and potential off-site impacts. Under Verra’s VM0036 methodology, for example, leakage caused by changes to hydrological connectivity must be avoided. A project that studies only its own area may therefore miss a large impact. 

A landscape-level view is not limited to water. Governance is equally important: long-term outcomes depend on cooperation with a multitude of governance actors and their diverging land-use interests. Neighboring landowners, grazing-rights holders, forestry operators, water authorities, and communities with traditional peat-cutting or turbary rights all have their own relationships with peatland, requiring a governance structure that takes into account these interactions. Due diligence necessitates scrutiny of this arrangement to ensure governance is equitable and durable - the kind of ongoing risk that Xilva MONITOR is designed to track after financial close.  

4. Do not confuse rewetting with instant recovery

Rewetting is not the same as recovery: methane emissions can rise in the short term, and full ecological recovery can take years to decades. A common misconception is that rewetting immediately transforms a degraded peatland from a carbon source into a fully functioning carbon sink. In reality, greenhouse gas outcomes may change gradually and can include trade-offs. While raising the water table can slow peat decomposition (and the subsequent release of carbon into the atmosphere) relatively quickly, vegetation recovery, peat formation and biodiversity improvements may take much longer.

Climate change adds another layer of uncertainty. Future droughts, altered rainfall and higher temperatures may affect whether restored water levels can be maintained, meaning that genuine restoration to recover functionality is a slow-moving process. Claims of rapid ecological restoration should be treated cautiously unless supported by robust monitoring evidence.

5. Scrutinize the carbon methodology

Peatland carbon methodologies are newer and more thinly benchmarked than forestry standards, which raises both technical and market-acceptance risk. Few projects have been registered under any given peatland methodology, leaving a gap in projects to benchmark against, and ambiguity in methodological interpretations. Methodology risks also have a commercial dimension. Early-stage or infrequently used standards may face limited market familiarity and weaker buyer acceptance. 

Due diligence should confirm that the project applies the correct methodology, tools and eligibility tests. Common risks include substituting an alternative monitoring approach without sufficient justification, incomplete nitrous oxide testing, weak baseline evidence, inappropriate carbon standard tools (i.e. Verra’s VT0009 vs. CDM Combined Tool), or failure to address above-ground biomass and hydrological leakage. 

For instance, the UK Peatland Code classifies baseline conditions such as actively eroding, drained or modified peatland; then, it estimates the emissions associated with the predicted restored condition. Meanwhile, Verra’s VM0036 uses vegetation composition and water-table depth as greenhouse gas proxies through the Greenhouse Gas Emission Site Type (GEST) approach.

6. Test the maintenance plan

Restoration infrastructure requires ongoing maintenance, and budgets that focus only on construction costs routinely underestimate this. Peatland restoration doesn't end when the infrastructure has been put in place. Dams can fail, drainage systems can reopen, and there may be issues caused by grazing livestock, wildfire, or invasive species. Nearby land management can change or governance arrangements may weaken over time. While these risks are not inherently unique to peatland, the need (and proper budget) for long-term adaptive management is especially critical in peatland projects. 

Investors often focus on initial intervention costs while underestimating inspection, repair, vegetation management, fire prevention, stakeholder engagement and monitoring over the project lifetime. The financial model should contain realistic maintenance provisions and contingency budgets for the long-term, taking into consideration that surface-level appearances may be deceiving of the actual progress being made. The project should also explain and be prepared for what happens if water levels decline or restoration structures fail, with detailed monitoring plans in place that anticipate scenarios where projected conditions are not achieved - this is the ongoing-risk gap that Xilva MONITOR is built to close. 

7. Do not treat ‘empty land’ as social vacuums

Peatlands that look remote, empty or unused can still carry significant tenure, access and livelihood interests that due diligence must not assume away. Projects may affect landowners, farmers, peat-cutting rightsholders, recreational users, water users and communities concerned about flooding, access or changes in landscape character. Restoration may also create jobs, improve water quality, reduce downstream flood risk and recover important wetland habitats. The impacts of peatland restoration on the social dimension are far-reaching and multi-faceted, which reflects the need for a diversified engagement approach.

The level of stakeholder engagement should be proportionate to the social context, but it should never be assumed unnecessary. Due diligence should verify land tenure, access rights, consultation processes, grievance mechanisms and arrangements for addressing unintended impacts on neighboring properties. 

The investment takeaway

Peatland projects have a lot to offer for the portfolios of carbon offtakers, and carbon markets can help pay for sorely needed restoration efforts. Current uptake of peatland credits and the emergence of active projects has been slow but the potential for restoration is large. According to the United Nations Environment Programme, 50 million hectares of peatland have already been drained, and restoration would contribute 10% of the total emission reductions and removals needed by 20301.

Whilst peatland carbon accounting can appear simpler than modelling decades of forest growth; the harder question in these ecosystems is whether the project can maintain the right hydrological conditions across a connected landscape for long enough to deliver durable climate benefits.

Strong projects combine technically appropriate restoration, conservative carbon assumptions, landscape-level cooperation, credible long-term financing and transparent monitoring. Weak projects rely on the appealing simplicity of “just add water.”

Xilva's GRADE due diligence framework is built to assess these dimensions — baseline hydrology evidence, restoration design, methodology selection, environmental and social impact, and long-term maintenance financing — before capital is committed to a peatland project.

For investors, the central lesson is straightforward: in peatland due diligence, what is visible at the surface is rarely the whole story. Let's dig in together!

Frequently asked questions

What is peatland due diligence?

Peatland due diligence is the independent assessment of a peatland project's hydrology, restoration engineering, carbon accounting methodology, governance and long-term maintenance plan before an investor or corporate buyer commits capital. It differs from forestry due diligence because the most valuable asset — stored peat carbon — is invisible and tied to water-table conditions that extend beyond the project boundary.

How much carbon do peatlands store?

Peatlands cover only 3–4% of Earth's land surface but store approximately 600 gigatons of carbon — nearly a third of the world's soil carbon [1][2]. Draining or degrading peat releases this carbon back into the atmosphere, which is why restoration and protection carry outsized climate value relative to their land footprint.

Does rewetting a peatland immediately turn it into a carbon sink?

No. Raising the water table slows carbon loss relatively quickly, but full ecological recovery — including stable vegetation, peat formation and reduced methane emissions — can take years to decades. Investors should treat claims of rapid restoration cautiously unless backed by ongoing monitoring data.

Which carbon standards apply to peatland projects?

The two most widely used are Verra's VM0036 methodology, which estimates emissions using vegetation composition and water-table depth (the GEST approach), and the UK Peatland Code, which classifies baseline degradation and estimates the emissions benefit of restoration. Because both are relatively new and thinly benchmarked, methodology risk is a distinct area of peatland due diligence.

What is the biggest risk in peatland carbon projects?

Hydrological risk is typically the biggest: water moves across property boundaries, so drainage on neighboring land, poorly designed dams, or unmapped drainage channels can undermine a project's climate benefit even when the on-site design looks sound. This is why due diligence needs to examine the surrounding catchment, not just the project area.

Why use an independent due diligence provider for a peatland project?

Peatland projects combine technical complexity — hydrology, restoration engineering, methodology selection — with governance and social risk that are easy to underestimate from the outside. An independent reviewer can test baseline evidence, verify restoration design and ‘as-built’ delivery, and stress-test the maintenance and monitoring plan before capital is committed, reducing the risk of funding a project that continues to leak carbon.

Sources

[1] United Nations Environment Programme, “Global Assessment Reveals Huge Potential of Peatlands as a Climate Solution”.

[2] International Union for Conservation of Nature, “Peatlands and Climate Change”.