Apparently it's legal to use fracking wastewater to water organic crops in rather dry California. This water is so toxic, companies won't release what's in it because of liability issues.
This practice certainly must violate the USDA National Organic Program rules here.
The USDA organic regulations describe organic agriculture as the application of a set of cultural, biological, and mechanical practices that support the cycling of on-farm resources, promote ecological balance, and conserve biodiversity. These include maintaining or enhancing soil and water quality; conserving wetlands, woodlands, and wildlife; and avoiding use of synthetic fertilizers, sewage sludge, irradiation, and genetic engineering.And more from the NOP PDF...
Organic crop producers are responsible for preventing contact between organic and conventionally-grown crops, as well as contact with prohibited pesticides or fertilizers. Split operations (farms that raise both organic and conventional crops) must make sure that organic crops don’t contact prohibited substances through accidental sprays of conventional agrochemicals, spray drift, or residues on equipment from non-organic fields.
Source: Mar 23, 2016.
Summary of US organic practices. Link to PDF.
This group says US regulations allow fracking wastewater to be used on organic crops.