Friends of Lake Olbolossat Foundation (FLOBF)

Located in Nyandarua County, Lake Olbolossat is Kenya’s only high-altitude freshwater lake in the Central Rift region. 

Nestled at the foot of the Aberdare Ranges, the lake is home to rich biodiversity, including hippos, waterfowl, ducks, geese, and endangered bird species such as the Grey Crowned Crane. It also supports farming, livestock keeping, fishing, and domestic water needs for thousands of people.

But over the years, pollution and unsustainable land use have placed this fragile ecosystem under growing pressure.

At Friends of Lake Olbolossat Foundation, we work closely with communities around the lake, and we’ve witnessed both the challenges and the progress firsthand.

Pollution Challenges Facing Lake Olbolossat

What’s happening to Lake Olbolossat today isn’t just something you read about in reports, it’s something local communities are witnessing every single day. 

The insights shared below are drawn both from scientific research conducted on the Lake Olbolossat watershed and from my own experiences working on the ground with the Friends of Lake Olbolossat Foundation. 

    1. Agricultural Runoff and Agrochemical Pollution

Farming is one of the main economic activities around Lake Olbolossat. Most households practice mixed farming, crop cultivation, and livestock keeping because the wetland provides fertile soils and water access.

However, research on the Lake Olbolossat watershed found that intensive farming practices are contributing significantly to water pollution. During rainfall, fertilizers, pesticides, and eroded soil are washed into streams and eventually into the lake.

The study revealed elevated levels of nitrates, total suspended solids (TSS), and dissolved solids in runoff water entering the lake, clear evidence that surrounding farms are a major source of contamination.

Excess nutrients such as nitrogen and phosphorus lead to eutrophication, where excessive algae growth reduces oxygen levels in the water. This threatens fish populations, aquatic plants, and the overall ecological balance of the lake.

The research also found that nearly 30% of local respondents identified agrochemicals as the leading cause of lake degradation.

    2. Livestock Grazing and Waste Contamination

Livestock keeping is deeply rooted in the local economy, but unrestricted grazing near the riparian zones has created additional environmental pressure.

Cattle frequently access the lake directly for drinking water, trampling vegetation and destabilizing the shoreline. Animal waste introduces bacteria, pathogens, and excess nutrients into the water, increasing the risk of contamination and waterborne diseases.

The research also highlighted that overgrazing contributes to soil erosion and sedimentation, which reduce the lake’s water-holding capacity over time.

For bird species that rely on wetland vegetation and nesting grounds, this habitat disturbance can be devastating.

    3. Soil Erosion, Deforestation, and Sedimentation

One of the most visible threats around Lake Olbolossat is land degradation caused by deforestation and poor land management practices.

Trees are cleared for farming, timber, and charcoal production, leaving soil exposed during heavy rains. Without vegetation to stabilize the land, runoff carries large amounts of sediment into the lake.

According to studies conducted in the watershed, farming on fragile slopes around the Satima Escarpment has accelerated erosion, leading to siltation and shrinking water storage capacity in the lake.

Community members have also reported that the lake water becomes visibly muddy during rainy seasons due to increased sediment inflow.

Sedimentation not only affects water quality but also destroys aquatic habitats and alters breeding grounds for fish and birds.

    4. Water Abstraction and Declining Water Levels

As the surrounding population grows, dependence on the lake continues to increase.

Research conducted in the basin found that communities closest to the lake rely heavily on it for domestic water use, irrigation, and livestock watering. Excessive water abstraction, especially for irrigation farming, has contributed to declining water levels.

Poor irrigation practices often lead to water wastage and increased runoff pollution. Some boreholes in surrounding areas have also reportedly dried up, placing even greater pressure on the lake itself.

Climate variability further worsens the situation. Irregular rainfall patterns and high evaporation rates reduce water availability, concentrating pollutants and making the ecosystem more fragile.

    5. Plastic and Solid Waste Pollution

Human settlement and growing economic activities around the lake have also led to increased plastic and solid waste pollution.

Discarded plastics often end up in streams and wetland areas, where they threaten wildlife through ingestion and entanglement. Plastics also break down slowly, releasing harmful chemicals into the environment over time.

Without proper waste management systems, pollution continues to accumulate around critical wetland habitats.

How We’re Restoring Lake Olbolossat

Despite these challenges, restoration efforts are making a difference.

At Friends of Lake Olbolossat Foundation, we believe long-term conservation only succeeds when local communities are actively involved.

    1. Community Education and Awareness

One of the most powerful tools in conservation is education.

We regularly organize workshops, training sessions, and community meetings around Lake Olbolossat ecosystem to help farmers and residents understand how land-use practices affect the health of the lake.

Through these programs, we promote:

• Sustainable farming methods
• Agroforestry practices that support both livelihoods and conservation
• Responsible agrochemical use
• Proper waste disposal
• Conservation awareness and environmental stewardship
• Riparian protection
• Improved livestock management
• Tree planting and ecosystem restoration

We also encourage practical solutions, such as creating livestock watering points away from the lake and establishing vegetative buffer zones along streams.

These small but meaningful changes reduce direct pollution entering the water system.

    2. Tree Nurseries and Seedling Distribution

Reforestation is central to restoring the watershed.

At our tree nursery in Rurii, Olkalou, and Murunguru, Kinangop, we grow indigenous species such as Acacia and Olea africana, alongside fruit trees, like avocado, plum, and apples, and other suitable species for local farms.

These trees help:

• Stabilize soil
• Reduce erosion
• Generate income
• Filter runoff
• Restore wildlife habitats
• Improve local livelihoods

In 2025 alone, we distributed more than 65,000 tree seedlings to farmers, schools, and other community groups around the watershed. We have more than 20,000 fruit tree seedlings ready for distribution. 

    3. Kirima-Muruai Tree Planting Initiative

Our restoration work extends beyond household planting.

In the Kirima Muruai escarpments, we have already planted over 110,000 indigenous tree seedlings across 270 acres in an effort to rehabilitate degraded catchment areas.

Our goal is to plant an additional 150,000 trees over the next 1 year.

Healthy forest cover improves water infiltration, reduces sediment flow into the lake, and strengthens the resilience of the entire ecosystem against climate change.

    4. Partnerships and Collaborative Conservation

Protecting Lake Olbolossat requires collaboration.

We work closely with conservation organizations, local communities, county governments, and environmental stakeholders to strengthen restoration efforts. These include the County Government of Nyandarua, Community Forest Association (CFA), SACDEP, and Kenya Forest Service. 

Through partnerships, we coordinate:

• Tree planting campaigns
• Clean-up exercises
• Biodiversity monitoring
• Conservation awareness programs
• Community-led restoration projects

Collaboration also helps ensure conservation efforts are sustainable and supported by science, policy, and local participation.

Why Protecting Lake Olbolossat Matters

Lake Olbolossat is not just a body of water.

It is a source of livelihoods, biodiversity, culture, and ecological stability for thousands of people and countless species.

Scientific studies now clearly show that pollution, unsustainable farming, overgrazing, deforestation, and poor land management are accelerating the degradation of the watershed. 

But they also show that restoration is possible through sustainable land use, community participation, and conservation action.

And on the ground, we are already seeing signs of hope.

• Farmers are planting trees.
  Communities are protecting riparian zones.
  Young people are participating in clean-up efforts.
  More residents are becoming aware of how their daily activities affect the lake.

Every seed planted, every training session held, and every partnership formed brings us one step closer to restoring the health of Lake Olbolossat.