Mwangi v Muthoni & 2 others (Environment and Land Case E107 of 2022) [2026] KEELC 3515 (KLR)
The bottom line
#A Nairobi landowner won against neighbours and a contractor who let sewage and stormwater flood her property, winning a court order to stop it plus costs.
What this practically means
#Executive summary
#Key legal issues
#Whether the 1st and 2nd Defendants discharged wastewater onto the Plaintiff's land
Yes - the 1st and 2nd Defendants are liable under the rule in Rylands v Fletcher (strict liability); unchallenged evidence including the NECC report showed effluent seeping from their septic tanks through holes in the perimeter wall onto the Plaintiff's property.
The court applied the strict liability principles in Rylands v Fletcher as set out in Kenya Wildlife Service v Rift Valley Agricultural Contractors: the Defendants accumulated wastewater on their plots, a substance likely to cause mischief, which escaped through holes in the perimeter wall onto the Plaintiff's land, damaging plants and the environment. The evidence of PW1, PW2 and PW3, corroborated by the NECC report and photographs, was uncontradicted by the 1st and 2nd Defendants, who led no evidence. The holes in the perimeter wall evidenced deliberate and illegal channelling of wastewater, and their refusal to use an available alternative government drainage showed conscious intent.
Whether the 3rd Defendant unlawfully directed the estate's stormwater to the Plaintiff's land
Yes - the 3rd Defendant carried out the cabro and drainage works without the required NEMA, County and other statutory approvals and directed stormwater to the Plaintiff's gate using an inadequate system, constituting nuisance and negligence.
DW1 admitted the works had no approvals from NEMA, KURA, NCA or Nairobi City County and no EIA, hydrological report or mitigation measures. Section 58 of EMCA and Rule 7 of the Environmental (Impact Assessment and Audit) Regulations 2003 required an EIA project report, and section 57 of the Physical and Land Use Planning Act 2019 required development permission. The NECC report confirmed the Plaintiff's land lies on the lower gradient and that flooding risks existed absent a proper drainage channel. Absent the required reports, the 3rd Defendant unlawfully directed all estate stormwater to the Plaintiff's gate with an inadequate pipe.
Whether the Plaintiff is entitled to the reliefs sought
Yes - judgment entered for the Plaintiff on all heads: an order to stop the 1st and 2nd Defendants' drainage leakage, an injunction against the 3rd Defendant, and an order that the 3rd Defendant redirect stormwater to the government sewer or construct adequate drainage, plus costs.
The court answered all framed issues in the affirmative, holding the Defendants owed the Plaintiff a duty of care grounded in Article 42 of the Constitution (right to a clean and healthy environment) and the 'polluter pays' principle as applied in David M. Ndetei v Orbit Chemical Industries. Since the Plaintiff's evidence stood unchallenged except by DW1, and the reliefs sought matched the findings of nuisance and unlawful diversion of stormwater, the court entered judgment in full with costs to the Plaintiff.
Legal principles established
#- A person who brings or accumulates on his land anything which, if it escapes, may cause damage to his neighbour, does so at his peril and is liable if it escapes and causes damage, however careful he may have been.
- All necessary approvals must be obtained for any development, including road cabro works, regardless of how the works were financed; works carried out without such approvals are illegal.
- The Defendants owed the Plaintiff a duty of care not to pollute her property, grounded in the constitutional right to a clean and healthy environment.
Court orders
#- 1.The 1st and 2nd Defendants, by themselves, their servants or agents, are hereby ordered to stop their drainage, sewerage, or storm water from leaking from their properties into the Plaintiff's property known as LR No 12500/5 (parcel 951)
- 2.An injunction be and is hereby issued restraining the 3rd Defendant, whether by themselves, their servants, agents, or any other person or entity claiming under or through them, from directing the estate's storm water at the gate and property known as LR No 12500/5
- 3.The 3rd Defendants be and is hereby directed to drain the estates' storm water to the main government sewer, and or construct a drainage system whose levels will ensure that the estates' storm water does not leak into the Plaintiff's property, LR No 12500/5
- 4.Costs of the suit shall be in favour of the Plaintiff
- Jurisdiction invoked
- Original civil jurisdiction of the Environment and Land Court over a dispute relating to land use, nuisance and environmental degradation (Articles 42, 69 and 70 of the Constitution; EMCA and Physical and Land Use Planning Act, 2019 invoked)
Key timeline
#Practical implications
#Frequently asked questions
#Cite this brief
#Cite this brief
Caselaw, "Mwangi v Muthoni & 2 others (Environment and Land Case E107 of 2022) [2026] KEELC 3515 (KLR)", Case Analysis (2026). Not stated in judgment. Source: https://new.kenyalaw.org/akn/ke/judgment/keelc/2026/3515/eng@2026-06-05
Suggested citation format for research notes or client memos. Always verify the original judgment before relying on any point.