Nantucket Island’s Summer Appeal and Substance Concerns

Nantucket Island, often seen as a charming summer getaway on the New England coast, has its share of issues, as new data indicates. A recent wastewater monitoring report highlights that cocaine levels on the island are notably above the national average, a trend that has persisted since July 2025.

In October, the concentration peaked at 2,948.70 nanograms per liter, whereas the national average lingered below 1,000 nanograms. By December, Nantucket registered an even higher spike of 2,815.50 nanograms per liter.

When contacted for comment, the Town of Nantucket referred to a public dashboard that outlines these findings. Their website recognizes the island isn’t immune to the growing substance misuse and overdose crisis affecting many American communities.

“With summer populations that can quadruple, the town faces unique challenges in addressing behavioral health risks, despite having limited resources,” they stated.

During the peak summer months of July and August in 2021-2022, local records show that daily visitor numbers often hit around 40,000, and on particularly busy days, soared past 60,000.

Interestingly, these tests also showed lower-than-average levels of fentanyl—a potent synthetic opioid linked to a rising number of overdoses nationwide. This timing, during the COVID-19 pandemic, led many communities, including Nantucket, to start monitoring their water for various substances. As a result, the island has discovered unexpectedly high cocaine levels.

Despite its luxurious appeal, capturing the interests of celebrities and affluent individuals—like former NFL coach Bill Belichick, who recently sold his Nantucket home for $4 million—Nantucket faces a complex issue concerning substance use, which adds an unexpected layer to its idyllic reputation.

Former President Joe Biden’s family also frequents the island annually for Thanksgiving, indicating its allure remains as vibrant as ever, even with these alarming reports.