Project
Northern Collector Tunnel (Phase I) — Nairobi Bulk Water Supply
KenyaBulk Water Infrastructure, Water Infrastructure, Strategic Water Infrastructure
Full operationalisation of the Northern Collector Tunnel–Gigiri–Kabete transmission system announced by Nairobi County in 2026. Operational — correctly excluded from Active Pipeline.
Status
OperationalStatus
CompletedProcurement Status
Overview
- Location
- Nairobi metropolitan area, Kenya
- Scale / Scope
- 11.8km underground tunnel diverting water from the Maragua, Gikigie and Irati rivers to Thika Dam; adds approximately 140 million litres/day to Nairobi's bulk water supply.
Participants & Roles
Utility / Network Operator
- Athi Water Works Development AgencyLicensed by WASREB to operate the Northern Collector Bulk Water Supply System