Of the 185 lakes in the GHMC limits, 24 lakes are in the worst condition as they have very low dissolved oxygen levels and hence are identified as dead lakes. This means that the water from these lakes cannot sustain aquatic life and can be used only for controlled waste disposal, or industrial cooling, irrigation. According to the TSPCB (Telangana state pollution control board) (TSPCB), it took three years for the Bum-rukn-ud-dowla’s water quality to graduate to E category from below E category.
Among the dead lakes are the Mothkula Kunta in Machabollaram, the DMRL lake in Kanchanbagh, and the Tirumalagiri lake.
In 2018, the analysis of the lake samples collected suggested that the lake water quality was below the ‘E’ class.
The fresh reports say that the present analysis of the sample of the Lake water collected by the Board Official on 18th March, however, indicates that the lake water quality improved to ‘E’ class from below ‘E’ class. Activists like Amjed Ullah Khan of the Majlis Bachao Tehreek, not satisfied with this improvement, rued that the lake is being usurped by encroachers. He said, "Encroachments have eaten away many parts of the lake. The offenders first resort to drying up the lake, then dumping soil to make space on the lake bank. The concerned departments like the GHMC, irrigation, and revenue, despite these issues, are turning a blind eye."BV Subba Rao, an environmentalist from Hyderabad, notes that to avoid such discrepancies of the full-tank level from taking place, the water body must be demarcated properly.