Lough Neagh, located in Northern Ireland, is facing an environmental crisis due to commercial sand dredging, which has been conducted for decades. This activity not only disturbs specific areas of the lakebed but also has widespread ecological impacts. Recent research shows that dredging has lowered parts of the lakebed by up to 17 meters, creating significant physical changes that affect the entire ecosystem. The lake, which provides drinking water to 41% of Northern Ireland's population, has been plagued by toxic blue-green algal blooms since 2023, primarily caused by nutrient pollution and sediment disturbance. These blooms threaten wildlife and public health, as they are linked to the release of legacy phosphorus from disturbed sediments. The study reveals that sediment plumes from dredging can extend over a mile, affecting water clarity and food sources for fish and birds. Current regulations focus narrowly on dredging locations and volumes, neglecting the broader ecological consequences. To mitigate these effects, the study suggests practical measures such as adjusting dredging techniques and improving land management. Addressing the challenges in Lough Neagh reflects a larger global issue of increasing sand demand and its impact on aquatic environments.