Maui County detected trace amounts of selenium in the Makawao water system during routine testing, with confirmed levels of 3.7–4.9 micrograms per liter. The EPA’s maximum contaminant level is 50 micrograms per liter, meaning current levels pose no regulatory concern.
- Selenium was detected for the first time in the Makawao water system, confirmed by follow-up testing on June 19, 2026.
- Detected levels (3.7–4.9 mcg/L) are well below the EPA and state drinking water limit of 50 mcg/L.
- Maui County Water Supply notified the state Department of Health as required whenever selenium is first detected in a public water system.
- Selenium is a naturally occurring mineral that can enter water through erosion of mineral deposits and is considered safe at low levels.
- The county will continue monitoring the Makawao system and working with state health officials to maintain compliance.
Source: Maui News
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