The Nigeria Hydrological Services Agency (NiHSA) has warned that groundwater in parts of Lagos, Kebbi, and Kogi States now contains dangerous levels of toxic substances. The agency said continued use of the water could lead to serious health problems.
Director-General of NiHSA, Umar Ibrahim Mohammed, gave the warning in Abuja while presenting the latest Water Quality and Flood Assessment reports.
He said samples taken from Ikeja and Ikoyi in Lagos, Argungu in Kebbi, and Lokoja in Kogi State showed high levels of harmful chemicals.
Mohammed explained that the water contained nitrite, fluoride, lead and cadmium, along with strong microbial pollution.
He linked the contamination to industrial waste, sewage leaks, refuse dump seepage and rusty pipelines.
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The NiHSA DG said each pollutant poses serious risks. Lead can damage the brain. Cadmium harms the kidneys. Nitrite can cause “blue-baby syndrome.” Too much fluoride affects bones and teeth.
Mohammed noted that floodwater and poor drainage systems are making the situation worse. He also said many residents remain at risk because early warnings did not spread widely.
In Kogi State, tests showed lead levels between 0.56 and 12.0 mg/L, along with E. coli, Streptococcus and Salmonella, clear signs of faecal contamination.
In Kebbi State, several communities recorded arsenic levels between 0.75 and 4 mg/L, also with heavy microbial presence. He warned that long-term exposure can cause arsenicosis, liver damage, and stomach illnesses.
Mohammed called for urgent action. He urged federal and state governments to increase public awareness, improve water safety and ensure households get treated water.
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A water expert, Engr. Mathew Ajisafe advised families in the affected areas to stop drinking water from wells and boreholes. He urged state governments to supply clean and treated water through public utilities.
Esther Ososanya is an investigative journalist with Pinnacle Daily, reporting across health, business, environment, metro, Fct and crime. Known for her bold, empathetic storytelling, she uncovers hidden truths, challenges broken systems, and gives voice to overlooked Nigerians. Her work drives national conversations and demands accountability one powerful story at a time.
