"The Woolwich landfill differs considerably from the other two landfills on sand
aquifers in that the refuse is deposited in pits that are well above the water table. The bottom of the refuse and the water table are separated by 7 to 10 m of
partially-saturated sand. The thickness of the sand aquifer beneath the water table is 15 to 20 m. The water table across the site slopes southeastward, which is the direction in which a plume has developed since landfilling at the site began in the mid-1960's."

"The limit for 1,1,1 trichloroethane in drinking water suggested recently by the
U.S. Environmental Protection Agency is 200 micrograms per litre. The concentration levels in the Woolwich aquifer are very small relative to this value. The suggested limit for trichloroethylene in drinking water provided by the State of New York is 10 micrograms per litre. A few values above this limit occur very near the Woolwich landfill but not at distances from the landfill. To our knowledge, guidelines for these compounds in drinking water have not yet been produced by the Ontario Ministry of the Environment. The closest drinking-water well is about 1 km from the landfill in the direction of groundwater flow. The zone of identifiable aquifer contamination at the present time therefore has not yet moved sufficiently far to cause closure of wells."

I would find this small comfort if I was the one with the drinking well only 1 km away. This is a very old report done by the University of Waterloo. This one is titled "Full Text of proceedings: technology transfer conference no. 5".

P.S. U.S. E.P.A. drinking standard for TCE (Trichloroethylene) has been 5 micrograms per litre ie. 5 parts per billion (ppb) for about twenty years. Ontario has gone up and down, most recently down to 5 ppb. in 2006.