What begins as a modest stream cutting through the quiet edges of Parklands has turned into a channel of filth, carrying with it the consequences of unchecked development and failed oversight.
Along the stretch of Gitathuru River , flowing past Muthaiga Heights and North Highridge School before becoming Mathare River after crossing Limuru Road – residents say a full-blown environmental crisis has been allowed to fester in plain sight.
Behind the walls of modern apartment blocks, raw sewage is finding its way into the river.
For years, homes along 6th Avenue and City Park Drive have not been connected to the Nairobi City Water and Sewerage system. Instead, they rely on septic tanks — many of which are now overwhelmed or poorly managed.
Residents accuse some developers of taking advantage of this gap by constructing privately developed sewer lines that either fail under pressure or discharge waste directly into the river.
“When it rains, the manholes overflow and everything spills out,” said a resident who has lived in the area for over a decade. “The smell is choking. It’s not just water flowing anymore , it’s waste.”
What was once a natural waterway has steadily turned into a dumping ground.
Those living near the river say the situation is worsening as more high-rise apartments come up, increasing pressure on already strained systems.
“It feels deliberate,” another resident said. “Instead of proper connections, shortcuts are taken — and we are the ones paying the price.”
Efforts to seek justice have yielded little.
Residents have filed multiple cases citing violations of their right to a clean and healthy environment, but some have been dismissed in court.
Additionally Judges have, in several instances, relied on the principle that public authorities are presumed to have issued permits lawfully unless proven otherwise.
Residents insist the proof is there.
They point to video evidence showing sewage flowing into the river and refer to a May 2024 notice warning that any development within 30 metres of the riverbanks is illegal due to riparian protection rules.
Despite this, enforcement has remained weak.The pollution is no longer just an environmental concern — it is a public health risk.
Communities downstream along Mathare River face increasing exposure to contaminated water, raising fears of disease outbreaks and long-term health effects.
Environmental advocates warn that the damage could take years to reverse.
On the ground, frustration is growing.
“We are not asking for anything extraordinary,” one resident said. “We just want a clean environment. We want the law to apply equally.”
As the river continues to darken, residents say the silence from authorities is becoming harder to ignore.
For them, the crisis is no longer about a river — it is about dignity, health, and the right to live in a safe environment.