Abstract: On June 25, 2004, an employee, construction laborer, received a venomous spider bite, sp. Lactrodectus, Black Widow, to the penis while using a portable toilet. The employee was transported to Kern County Medical Center, where he received inpatient hospitalization for seven days as a result of injury complications. The sanitary facility was provided by the general contractor and developer and serviced weekly by the lessor, Knight's Portable Toilet and Plumbing. The facility was not available for inspection, although photographs provided by employer, show it to be in good condition. Employees reported the facility had not been used recently, although it was serviced the day prior to the event. Lactrodectus spiders are very common in the San Joaquin Valley and prefer an undisturbed inactive environment, such as the portable toilet. A causal factor for this event was identified. Employer instituted a training program to increase employee awareness for biologic hazards.