01 · The problem
What is happening
The Nairobi River system flows through informal settlements and industrial areas where sanitation coverage is incomplete. Untreated sewage, industrial discharges and dumped waste have severely degraded water quality. Repeated restoration efforts, including a government-led regeneration programme, have focused on clearing waste, relocating structures from riparian land and building sewer infrastructure.
High severity. Serious, widespread effects requiring sustained action. Severity is descriptive editorial metadata summarising documented effects. It is not a measured index or a score.
02 · Causes
Why it is happening
- 01
Inadequate sanitation
Many households in informal settlements lack sewer connections.
- 02
Industrial discharge
Some factories discharge effluent without adequate treatment.
- 03
Solid waste dumping
Waste is dumped along riverbanks and in channels.
03 · Impacts
Who and what it affects
- 01
Health risks
Contaminated water poses risks of waterborne disease to people who use or live near it.
- 02
Ecological degradation
Pollution reduces aquatic biodiversity.
- 03
Downstream effects
Polluted water flows on to communities and farms downstream.
04 · Solutions
Documented approaches
Sewer expansion and treatment
Extending sewer networks and upgrading wastewater treatment.
Expected effectReduces pathogen and nutrient loads.
Riparian restoration
Clearing waste and restoring vegetation along riverbanks.
Expected effectImproves habitat and public space.
Enforcement of discharge standards
Monitoring and penalising unlicensed industrial discharges.
Expected effectReduces industrial pollution.
05 · Key indicators
What can be measured
No reliable quantitative indicator is included for this issue. TerraLens shows figures only where a credible source supports them — consult the sources below for current data.
06 · Sources
Where this comes from
- [1]National Environment Management AuthorityGovernment of Kenyanema.go.ke(opens in a new tab)
- [2]Drinking-water fact sheetWorld Health Organizationwho.int(opens in a new tab)
Links open the publishing organisation's site. Some point to the publisher's main page, where the named report or dataset can be found.