The victim, Usha Chauhan, was a teacher at a government school in Shahbad Dairy, they said.
The accident occurred when she was returning with her husband on a scooter yesterday. They fell after the rider lost control of the two-wheeler. The vehicle's wheel had got stuck in a pit, the police said.
Before the woman could get up, she was run over by a water-tanker, they said.
She was taken to a hospital where she was declared "brought dead", the police said.