J.R. Henderson Labs, Inc About J.R. Henderson Labs, A State Certified Water Testing Laboratory Call Today to Schedule Service Since 1968, Henderson Labs has provided the state of New Jersey with quality water analysis. For more than 30 years we have worked with residents, businesses, and government agencies to ensure the quality of drinking water in the state of New Jersey. Henderson Labs is a state of the art laboratory that is certified and compliant with all NJDEP methods of testing. Our technicians are trained to operate some of today's most advanced analytical instruments for the quantitative measurements of both ground and drinking water. We are dedicated to providing our customers with accurate testing and sound consultation. It is the commitment to excellence and an impeccable reputation that has allowed us to maintain a large local and state wide client base.