Open dumping along stretches of the Mathare river basin near Kasarani is one of the clearest examples of how waste management failures translate directly into public health risk. This isn't an abstract environmental concern — it's a daily reality for the households living closest to affected stretches, and understanding exactly how it happens is the first step toward changing it.

What open dumping looks like along the Mathare basin

In areas without reliable collection, open dumping tends to concentrate wherever the terrain makes it easiest — steep slopes, undeveloped plots, and, especially, riverbanks and drainage channels, where waste can be tipped without needing to be carried far or hidden from view. Along parts of the Mathare basin near our service area, this has meant a steady accumulation of general waste, plastic, and in some cases hazardous material like broken glass and old batteries, sitting directly in or beside water that eventually flows through much more densely populated areas downstream.

It's rarely the result of carelessness so much as absence of alternatives — the same pattern we've seen and addressed in Mwiki, where riverbank dumping dropped sharply once a reliable collection schedule reached the area.

The direct health risks

Open dumping near waterways creates several distinct health hazards, not just one. Stagnant water pooling around blocked, waste-choked drainage becomes a breeding ground for mosquitoes, directly increasing malaria risk in surrounding compounds. Decomposing organic waste mixed into open dumps attracts flies and rodents, which spread disease well beyond the dump site itself. Where dumped waste includes human or animal waste, contamination of downstream water used for washing or, in some cases, informal water collection becomes a direct pathway for waterborne illness. And children, who are drawn to open spaces including riverbanks regardless of what's dumped there, face direct injury risk from broken glass, sharp metal and other hazardous debris.

None of these risks are hypothetical or specific to Kasarani — they're well-documented patterns anywhere open dumping meets inadequate drainage, which is precisely why waste management and public health are treated as connected issues by health authorities generally, not separate concerns.

Why this is a systems problem, not an individual one

It would be easy, but wrong, to frame open dumping purely as a matter of individual littering. In our experience, the households dumping near the Mathare basin are, in the great majority of cases, not doing so out of indifference — they're doing so because no reliable, closer alternative exists. Waste has to go somewhere, and in the absence of scheduled collection, the path of least resistance leads to open ground and waterways. This is why our approach to reducing open dumping has always centred on expanding reliable collection first, rather than relying on awareness campaigns alone to change behaviour that infrastructure gaps are actually driving.

What we're doing about it

Our response has three parts, working together rather than as alternatives to each other. First, expanding door-to-door collection into affected areas, since a scheduled alternative is the single most effective way to reduce fresh dumping. Second, running periodic clean-ups to clear waste that has already accumulated, in coordination with community health volunteers who know the specific hotspots best. Third, direct engagement with residents in affected areas to understand what's stopping them from using existing collection where it is already available, since sometimes the barrier is cost, distance, or simply not knowing a schedule exists rather than access itself.

What residents near the Mathare basin can do

  • Report specific dumping hotspots to us directly, ideally with a location description, so we can prioritise clean-up and assess whether collection needs to be extended there.
  • Use scheduled collection where it's already available rather than the riverbank, even if it means holding waste an extra day.
  • Join a clean-up if you're able — our monthly rotation regularly includes riverbank sections, and no prior experience is needed.
  • Talk to neighbours about requesting collection expansion together; group requests from a street or estate are the fastest route to being added to our schedule.

What health data tells us, cautiously

We're careful not to overstate a direct causal link between specific health outcomes and specific dumping sites without proper epidemiological study, which is beyond what a community organisation like ours can conduct. What we can say, based on well-established public health research more broadly, is that the mechanisms connecting waste-choked drainage to increased malaria risk, waterborne illness and injury are well documented globally, and there's no reason to think the Mathare basin near Kasarani would be an exception to those general patterns.

Coordination with community health volunteers

Much of what we know about specific health-relevant dumping hotspots near the Mathare basin comes directly from community health volunteers, who are often the first to connect a cluster of illness in a specific area to a nearby environmental hazard like blocked, waste-choked drainage. Our clean-up planning increasingly relies on this kind of frontline health knowledge rather than treating waste clearing and community health as separate concerns handled by entirely different actors.

Why we avoid framing this as purely a Kasarani-specific problem

Open dumping and its health consequences along stretches of the Mathare basin aren't unique to the parts of Kasarani we serve; the same basin runs through several other Nairobi neighbourhoods facing similar collection gaps. We mention this not to diminish the local urgency but because it's a useful reminder that solving it fully will eventually require coordination beyond what any single community organisation working one stretch of riverbank can achieve alone.

Frequently asked questions

Is my area part of the Mathare basin at risk of these health issues?

If your compound is near a stream, drainage channel or low-lying open area that regularly floods or collects standing water during rains, it's worth assuming yes and taking basic precautions, regardless of exact boundaries.

What should I do if I see fresh dumping near a waterway?

Report it to us with a location description. We prioritise clean-up planning around confirmed hotspots reported by residents.

Can collection be extended to areas near the Mathare basin that don't have it yet?

Potentially, yes — see how our route has grown from two villages to six over time on our blog, and reach out via our Get Involved page to request consideration.

Open dumping near waterways is solvable, but only with a genuine collection alternative behind it. If your area needs one, tell us.