No need. Fracking fluids have their own distinctive trace ingredients, which are on record for each well.
To date, none of these trace ingredients have shown up in the water table or anybody's well.
The only occasions of pollution by fracking fluids have occurred in surface spills -- readily remedied a carrying a clear liability.
And, modern fracking liquid is biodegradable, no? So the remediation consists of inoculating the spill with appropriate bacteria which eats up the chemicals involved.