The Odra, Poland's second longest river, has been polluted by a still unidentified toxin that has killed thousands of fish in one of Poland's worst environmental disasters in recent years.
Morawiecki took to social media to recount his meeting with soldiers and firefighters who have been assisting with the river's clean up in the town of Uraz, in south-western Poland.
"I have come to Uraz to thank you for your help here and to express my respect," he wrote.
"We will allocate the necessary resources to restock the river, so that the River Odra can be reborn," the prime minister added.
He pointed out that "today, we are focusing our efforts on removing the effects of an environmental disaster and trying to determine its cause."
Morawiecki reiterated that a special debate would be held on how to tighten regulations concerning the discharge of chemicals into waterways.
Describing Poland's "beautiful nature" as a common heritage and national asset, the prime minister added: "That's why I'll do everything to not only to ultimately ascertain the cause of this dreadful ecological event, but also to build preventative security mechanisms wherever possible.
"Forests, lakes and rivers must be looked after, not only for us but for future generations," he added. (PAP)