Over five years, San Joaquin County lived through the deadliest chapter of the drug epidemic, driven by one change: illicit fentanyl saturated the local supply. The county's fentanyl death rate in 2021 was 20 times higher than in 2018, and deaths more than doubled again the next year, from 48 in 2021 to 113 in 2022. At the peak, the county was losing four to five residents a week, and people in their 20s and early 30s died faster than any other age group.

In 2024 the county's opioid overdose rate finally dropped about 31 percent — the first sustained decline since the crisis began — helped by naloxone saturation, fentanyl test strips, and a $137 million treatment expansion. But three things complicate any relief. Methamphetamine now kills more Californians than any other single drug, and meth deaths are still rising as fentanyl deaths fall. A veterinary tranquilizer called xylazine is spreading up the West Coast toward the Central Valley. And in December 2024, Proposition 36 reversed a decade of California drug policy, restoring felony charges for repeat offenses just as the public-health approach began to work.

This report traces how the crisis rose and eased, who it hits hardest, how the drug supply chain reaches Lodi, what treatment and enforcement are doing, and what the open questions — from settlement spending to the methamphetamine gap — can and cannot yet be answered.