The pipeline runs from a seaside residential area, across a seawall and into the water near a beach popular with residents and tourists.
The inspection was carried out after residents reported the structure to local authorities.
Preliminary findings suggest the pipeline was previously used to draw seawater for shrimp farming operations in the area.
Local authorities said that aquaculture activities have since ceased and the pipeline is no longer in use, while its owner has yet to be identified.
Inspectors have found no evidence that the pipeline is being used to discharge wastewater or other pollutants into the sea.
The exposed structure, particularly at low tide, may have led some residents to mistakenly believe it was an illegal wastewater outlet, potentially affecting the area's tourism image.
The pipeline has also raised concerns over public safety and coastal aesthetics.
The public services centre of Bac Nha Trang Ward said it would continue reviewing relevant records to determine ownership of the structure.
If the pipeline is confirmed to have no remaining use and its removal poses no risk to the marine environment, natural terrain or existing infrastructure, officials may propose dismantling it.
