| 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% |
