Selenium detected in Kaunakakai water system on Molokaʻi

Routine water quality testing has identified trace levels of selenium in the Kaunakakai water system on Molokaʻi, which is managed by the Maui County Department of Water Supply (DWS).

Initial detection occurred in samples collected on July 15, 2026. Follow-up testing on August 11 confirmed selenium levels between 2.3 and 2.4 micrograms per liter. Officials noted that these levels are significantly below the drinking water standard of 50 micrograms per liter established by the U.S. Environmental Protection Agency and the Hawaiʻi Department of Health.

Selenium is a naturally occurring mineral element found in soil and rocks; its presence in water is often attributed to the natural erosion of mineral deposits. State health officials stated that the detected levels are unlikely to pose a public health risk. The DWS is required to notify the Department of Health of such detections and will continue to monitor the system and inform the community.