Ocean System Lab (OSL) has been offering water quality testing to the USVI community for over 25 years. We have two labs in operation, one on St. Thomas and the other on St. Croix. Our staff are trained and certified in laboratory and field monitoring practices for environmental water quality analysis. We provide a broad range of microbiological and chemical water testing services. Whether you are home or business owner/renter, our staff can gladly assist you in investigating the quality of your water.