Providing the Standard for Excellence in the Groundwater Tracing Industry Since 1973

Fluorescent Tracer Dye Specialists in Water and Land Use Investigations

417  785  4289

Located in the heart of the Missouri Ozarks, the Ozark Underground Laboratory, Inc. (OUL) is a private consulting and contract studies firm which provides groundwater tracing and other hydrogeological services nationwide as well as internationally.  The OUL has been in continuous full-time operation since 1973 under the direction of Tom Aley, who serves as Principal Hydrogeologist, and Cathy Aley, who serves as Senior Project Scientist.  The OUL has a staff of ten full time employees.  The OUL is not affiliated with any academic institution and has no academic responsibilities that could interfere with full client service.  The OUL has designed, conducted, and assisted with over 4,000 groundwater traces in the United States and Canada in addition to traces in Australia, Barbados, Indonesia, New Zealand, and Peru.

About Us

The Ozark Underground Laboratory, Inc. (OUL) is devoted to helping clients find solutions to groundwater issues and understanding the causes of and remedies to those issues.  The OUL values the environment as the greatest available resource to any community and believes in implementing best hydrogeological and environmental practices to protect and integrate communities and their environments.  The OUL is committed to excellent quality of work with emphasis on attention to detail and successful dye tracing investigations.  The OUL wants to take the time to listen to you and understand your situation as clearly as possible so as to provide the best service possible.

Mission Statement

The OUL is focused primarily on land and water use issues in karst and fractured rock landscapes.  Emphasis is placed on interactions between surface activities and resulting subsurface impacts.  Many clients also utilize the OUL for its ability to analytically detect fluorescent tracer dyes, some of which can be detected in the low parts per trillion range using a Shimadzu RF-5301PC Spectrofluorophotometer and proprietary software developed by the OUL.

Charcoal packet placed in stream for dye tracing evaluation

The OUL has conducted numerous investigations and projects for various federal agencies; these have included the U.S. Forest Service, Bureau of Land Management, National Park Service, Department of Energy, U.S. Environmental Protection Agency, U.S. Fish and Wildlife Service, U.S. Army, U.S. Navy, and the U.S. Army Corps of Engineers.  In addition, the OUL has conducted work for numerous state, municipal, corporate, and private clients, some of those entities on long term master projects spanning years.


For more information concerning dye tracing and the OUL's procedures and criteria, you can download the Groundwater Dye Tracing Handbook (which has become the standard for the industy), OUL Procedures and Criteria, and other relevant documents here.  To see the OUL statements of qualification and range of products and services, click here.

1572 Aley Lane        |        Protem, Missouri 65733        |        Phone  417-785-4289        |        FAX  417-785-4290

© Copyright Ozark Underground Laboratory 2016