The state Department of Health said radiation test results for big rainwater catchment systems on neighbor islands showed “non-detect” levels for all radionuclides checked.

“So basically, everything is undetectable,” said Jeff Eckerd, acting program manager of the department’s indoor and radiological health branch.

The testing was done April 18 and 19 at large-scale rainwater catchment systems on Hawaii island, Maui and Kauai, Eckerd said.

The systems can hold millions of gallons of water. Eckerd previously said any levels of radiation from Japan’s nuclear crisis making its way into the catchment systems could be diluted by large volumes of water already in the systems.