Environmental groups are demanding data on water contamination in the vicinity of all Quebec's hydrocarbon wells drilled over the past 20 years. They say they deplore the absence of data on groundwater near wells drilled using hydraulic fracturing, or fracking -- 19 out of 31 in the Saint Lawrence Valley. Their demand comes after analyses that concluded groundwater quality has deteriorated in the Murdochville sector of the Gaspé Peninsula, even years after exploratory drilling.