Annually, Timewell participates in the National Transportation Product Evaluation Program (NTPEP) audit and has continually received the Certificate of Compliance following the audit. Successful completion of the NTPEP audit indicates the products made by Timewell comply with AASHTO M252 and M294 standards for High Density Polyethylene (HDPE) pipe. Continually receiving NTPEP Certification is also an expression of Timewell’s dedication to product quality.

Plastics Pipe

Timewell Drainage Products is a member of the Corrugated Plastic Pipe Association (CPPA), which is a division of the Plastics Pipe Institute (PPI). As an active member, Timewell participates in the development and promotion of industry standards as well as quality research programs which improve corrugated pipe and accessory products. Membership in the CPPA is a testimony to Timewell’s commitment to product quality and industry leadership.

Timewell is a member of the Agricultural Drainage Management Coalition (ADMC), an organization that serves as a resource for the latest technologies in drainage water management systems. The organization and its membership are committed to assisting the agricultural and environmental communities in improving water quality and increasing yields for food and energy producers through installing more effective and smarter agricultural drainage systems.


MaXflo AASHTO pipe from Timewell is currently approved for use on Department of Transportation projects in each of the following states:

Alabama, Arkansas, Illinois, Indiana, Iowa, Kansas, Kentucky, Minnesota, Mississippi, Missouri, Nebraska, North Dakota, South Dakota, Tennessee, Texas, West Virginia and Wisconsin.

Timewell’s ongoing work with NTPEP is a conduit for approval in most states. If yours is not currently listed, give us a call at 800-720-8453 to find out if Timewell’s MaXflo AASHTO pipe is approved for DOT projects in your state.

Timewell is an accepted vendor for major metropolitan sewer districts such as Kansas City, MO, Nashville, TN and Louisville, KY. We are constantly improving and promoting HDPE pipe and working closely with leading communities.