Lagos Clears 1,544 Illegal Drainage Structures, Leaving 674 Still Blocking Flow as Flood Costs Loom

Lagos, a low‑lying coastal megacity, relies on a network of primary and secondary drainage channels to move rainwater to the lagoon. When buildings, shacks or other structures are erected on or beside these alignments, water backs up, flooding neighbourhoods, damaging roads and endangering lives. The State Ministry of Environment and Water Resources created the Drainage Enforcement and Compliance Department to locate and remove such obstructions.

From 2025 through April 2026, enforcement teams demolished or removed 1,544 illegal structures on drainage channels. The department had previously identified a total of 2,218 structures situated on or blocking drainage alignments, meaning the clearance represented a 70 % success rate. Approximately 674 structures—about 30 % of the total—were not removed during the review period, and no timeline was given for their future clearance. In addition to the demolitions, the ministry reported restoring 12 kilometres of primary channels, clearing 123.5 metres of right‑of‑way, and cleaning roughly 210 kilometres of secondary and tertiary drains across all 20 local government areas. Nine facilities were sealed for illegal wetland encroachment in areas such as Ogombo, Lekki Phase II, Itoikin‑Epe and Majidun in Ikorodu. Flooding in Lagos causes losses that run into billions of naira each year, and a ministry‑cited estimate warns that climate inaction could cost the city close to $40 billion by 2050.

The removal of 1,544 structures shows that targeted enforcement can make a measurable dent in drainage blockages, but the remaining 674 obstructions leave a significant vulnerability. Continued flooding risk depends on how quickly those structures are addressed and whether new illegal construction is curtailed. The ongoing works—new secondary collector drains totalling over 100 kilometres and 30 kilometres of primary channels—aim to expand capacity, yet their benefits will only be realized once completed. Without sustained clearance and effective planning, the projected $40 billion climate‑related cost by 2050 may become harder to avert.