Last year, the US Environmental Protection Agency (EPA) released the draft of a major report on the practice of hydraulic fracking—a technique to harvest oil and natural gas trapped within shale rocks. Although the report is only a draft, it was four years in the making and represents one of the first formal evaluations of fracking in the US as a whole.

In general, the EPA report is positive. While various problems with fracking are brought up, the report seems to suggest that the technique has no systemic issues. With proper caution, the evaluation says, it should be possible to frack while keeping water sources safe.

Or, to use the EPA’s own words: