What did nuclear fallout from chernobyl do to ground and surface water?

The nuclear fallout from Chernobyl contaminated the ground and surface water with radioactive materials, such as cesium-137 and strontium-90. This has resulted in long-term contamination of water sources and ecosystems and poses health risks to humans and wildlife who may come into contact with the contaminated water. Efforts have been made to monitor and mitigate the impact of this contamination.