The fire service worked through the night to assist with the pumping of toxic water from a disused mine near Truro.
Pumps are currently at full capacity at Wheal Jane. Levels are still rising, but at a slower rate than yesterday.
There are fears that rising levels could pollute the nearby river and Fal Estuary, a marine special area of conservation, although there has been no pollution so far.
More top news
A little boy from Cornwall who lost his arms and legs is about to get the chance to meet his soccer heroes in the next few days.
A manhunt is underway after two men were shot - one fatally - at a residential site on Thursday evening on 5 May.
More than 2,000 young people are gathering on Dartmoor today ready to take part in the Ten Tors challenge.