For the city , the problem began at the Kensico Reservoir in Valhalla , in central Westchester , part of the network that carries water to the city from upstate .
Valhalla /location/location/contains Kensico Reservoir
IN DT NN , DT NN VBD IN DT NNP NNP IN NNP , IN JJ NNP , NN IN DT NN WDT VBZ NN TO DT NN IN JJ .
Valhalla
LOCATION
Kensico Reservoir
LOCATION
/location/location/contains