At present a hydrological regime of the river is essentially changed. Maximal stock is observed in August, while up to the irrigation period the maximal stock was registered in April. Such essential changes of hydrological regime leads to the destruction of ecological state of Yavansu valley. Many mineral water sources were exposed to the fundamental change. The development of mining industry, especially mining of construction materials, is frequently followed by alteration of hydrological regime, change of circulation and capacities of ground waters.
Some illegal quarries expose river basins and soils to big danger.
The concentration of suspended fractions in the waste water of mining enterprises 200 times exceeds natural concentration. Sewage treatment facilities of many villages and cites do not correspond to the standards. The essential quantity of rural settlements do not have sewage treatment constructions at all. Peculiarly essential impact on the river basins has been observed on the south and north of Tajikistan. Activity of some industrial enterprises favours river pollution.