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State Regulation   Percentage of Drilling States
Waste pits must have leak-proof liners. Yes 85%
  No 15%
Waste pits must be away from rivers and streams. Yes 37%
  No 63%
Waste pits can't intersect the water table. Yes 44%
  No 56%
Well construction has casing that extends below deepest groundwater. Yes 93%
  No 7%
Cement used to encase wells must harden and be tested before Yes 78%
hydraulic fracturing. No 22%
A spill of toxic fluids must be reported. Yes 85%
  No 15%