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Crawford Hydrology Laboratory provides professional consulting and field and laboratory services regarding groundwater tracing in karst and non-karst areas.

We specialize in groundwater investigations with the use of fluorescent dyes and utilize techniques we have developed and enhanced over the past 38 years. We provide quality supplies and analyses for groundwater traces and conduct full field investigations. Crawford Hydrology Laboratory has extensive experience conducting dye trace investigations for commercial clients as well as government agencies.

We look forward to working with you!


CHL Holiday Schedule

Dear valued clients,

We here at CHL, as always, hope you are doing well as the new year approaches. In observation of the winter holiday season, the lab will be closed November 27-29 and December 23-January 6. We will not be offering expedited analysis or overnight supply shipments from December 16 – January 6. The lab will be accepting shipments throughout the holiday break, however samples received after December 18 will not be officially checked in until January 6. If you anticipate needing supplies or if you have any other concerns pertaining to the lab schedule, please contact us prior to December 16 so we can plan to accommodate your needs during this time.

Thank you for choosing CHL for your dye tracing needs, we look forward to continuing to assist you in 2020. Enjoy a happy and safe holiday season!

All the best to you from the CHL team!

UNESCO Karst 2020

UNESCO Karst 2020 registration is now open! Submission deadline for poster presentations has been extended to December 20, 2019. Early bird registration rates available through January 31, 2020. 

Emergency Response Expedited Services

CHL can mobilize quickly to meet expedited client schedules in situations where fast action is required!


CHL Director, Chris Groves awarded medal from Chinese Geological Survey and honored at the “Reception for Foreign Experts Celebrating the 70th Anniversary of the Founding of the People’s Republic of China.”