On Friday, the fire service said it received about 100 flood-related calls, with “dozens” involving people trapped in cars.
It urged motorists who considered driving through flood water to “turn around and find another safe route”.
“We know it’s frustrating when your route is blocked and you just want to get to your destination,” a statement on social media said.
“It will take far less time to turn around than it would waiting for us to rescue you and then for a recovery company to pull your vehicle out.”
On Wednesday, a van driver in north Essex had a “lucky escape” after his vehicle ended up in a flooded ford.
A flood alert for the River Roding in Loughton, external and several others remained in place across Essex following days of heavy rain.
