Which fly is known for laying eggs in sewers or drains?

The moth fly is recognized for laying eggs in areas with high moisture levels, such as sewers, drains, and decaying organic material. This habitat provides the ideal environment for their larvae to thrive, as they require damp conditions for optimal development. Moth flies are often found near stagnant water or areas where organic waste accumulates, which makes sewer and drain environments particularly suitable for them. They typically breed in the organic matter found in those locations, leading to their association with unsanitary conditions.

The other flies listed have different reproductive habits and prefer other environments for laying their eggs. For instance, vinegar flies are often found around fermenting fruits and vegetables, while blow flies are typically attracted to decaying animal matter. The humpback fly is not noted for this specific behavior, making the moth fly the best choice for the question regarding egg-laying in sewers or drains.