Napa County is located north of San Pablo Bay in northern California. The population is about 136,000 residents. The city of Napa is the largest municipality in the county. Prostitution and sex trafficking activity have been well-documented in the city of Napa and surrounding communities, and in unincorporated areas of Napa County. This activity and the problems and ancillary crimes it generates result in complaints to law enforcement agencies from residents and businesses. Among the more serious crimes associated with the local commercial sex market is child sex trafficking. For example, in May 2011, two brothers were arrested on suspicion of sex trafficking a juvenile girl, according to the Napa Police Department. They were arrested during a probation search, and officers allegedly found text messages on one man’s phone indicating trafficking of the girl, including times and costs for sexual acts and nude pictures he used to advertise to buyers. The minor was allegedly advertised on a website. The suspects were arrested on suspicion of prostitution, possession of child pornography (i.e, child sexual abuse materials), conspiracy, and violation of probation, and both were booked into the Napa County jail.

In July 2017, a six-month investigation culminated in the arrest of a Napa man for pimping and pandering. The suspect contacted an undercover detective online and attempted to recruit her for prostitution, telling the detective that he would come to Napa County to pick her up and take her to another location to “work.” When he arrived at the agreed upon location, he was met by NSIB detectives and arrested. In August 2018, the NSIB conducted another prostitution sting, resulting in the arrest of a 22-year-old Napa woman whose 7-month-old child was taken into protective custody by Napa County Children’s Welfare Services. Detectives received information that a Napa woman was engaged in prostitution from her apartment on Solano Avenue, and NSIB detectives served a search warrant. Detectives learned the young mother was first sex trafficked in Napa County at the age of 16, and was currently engaging in prostitution at home, sometimes while her infant was home with her. In addition, documented violence associated with commercial sex in Napa includes cases of pimps committing armed robbery against sex buyers. In 2022, a Napa County couple was sentenced to California state prison in a sex trafficking case involving a girl they lured to the area from Georgia. The couple operated out of their home in American Canyon and recruited the minor victim and other young women to engage in prostitution throughout Northern California. One of the defendants was sentenced to 16 years in state prison after pleading no contest to pandering a minor, assault with a deadly weapon, felon in possession of a firearm, and resisting arrest. The other was sentenced to seven years and after pleading no contest to pandering a minor, identity theft, and false personation.