The agency, in a statement signed by its Director-General/Chief Executive Officer on Sunday, Umar Ibrahim Mohammed, said the Lagdo Dam Authority was currently impounding water into the reservoir and had not commenced any release.
According to NiHSA, the current water level at the Lagdo Reservoir is 209.82 metres, compared with the maximum operating level of 216 metres, leaving a margin of 6.18 metres for additional water to be impounded.
The agency also said the Kainji and Jebba reservoirs on the River Niger were recording relatively low inflows compared with their long-term averages and remained within their normal operating levels.
It put the current water level at Kainji at 130.38 metres, against a maximum operating level of 141.83 metres, while Jebba stood at 100.03 metres.
NiHSA said there was, therefore, no basis for the reported fears that water released from the dams was responsible for the flooding currently affecting parts of Taraba and Benue States.
The agency attributed the flooding being witnessed in different parts of the country mainly to flash floods triggered by intense and prolonged rainfall.
It noted that the situation had also been worsened by human activities, including inadequate drainage, indiscriminate disposal of waste and unauthorised urban development.
NiHSA urged Nigerians to rely on information released through official government channels and avoid circulating unverified reports on social media.
It assured the public that any water release from Lagdo Dam capable of affecting downstream communities in Nigeria would be carried out in accordance with established dam-management procedures and appropriately communicated.
The agency further disclosed that it was continuing to monitor the Lagdo Reservoir and other inland water bodies across the country to provide timely flood information and early warnings.
NiHSA reaffirmed its commitment to protecting lives, livelihoods and property through reliable and impact-based flood forecasting and early warning services.