Sewer Rehabilitation Project

Castle Rock Water staff identifies sewer pipes for rehabilitation based on a history of root intrusion, increased annual maintenance and pipe defects identified by closed circuit televised (CCTV) inspection. Sewer pipes with capacity issues are also identified as candidates for replacement with larger pipes.  Engineering staff develop plans for rehabilitation based on the severity of the defects found.

Cracked sewer pipes can often be repaired from within by pulling a new liner through the sewer pipe. The in-situ method of cured-in-place pipe (CIPP) lining has been in practice since the 1970's and involves pulling a resin-saturated felt tube into the damaged sewer pipe. The tube is then expanded and cured into a new tight-fitting, jointless pipe within the existing sewer pipe. CIPP lining can extend the service life of sewer pipes by 50-75 years. Rehabilitation by the installation of a CIPP liner, before the sewer pipe deteriorates to a failed condition that might require a street-cut to repair, is cost-effective, and can be completed with minimal disruption to service and results in less future maintenance.  

Severe sewer pipe defects and undersized pipes must be dug-up and exposed in order to complete the repairs. When completed on short sections of pipe, these are referred to as "open-cut point repairs". Sometimes a few critical open-cut point repairs must be completed in advance of CIPP lining a long stretch of sewer pipe.  


In 2016, Castle Rock Water rehabilitated clay pipes in the Castle North neighborhood. The sewer pipes in this neighborhood were installed in the early 1970's and were exhibiting severe cracking, joint separation and root intrusion. The Town contracted with Insituform Technologies to complete CIPP lining of nearly two miles of pipe in the neighborhood.  The lining project was successfully completed on time and under budget for $210,137.
During 2014, the Castle North neighborhood and several pipes in the Downtown area were the focus of a sewer rehabilitation project to complete point repairs of broken or damaged sewer pipes. Point repairs were completed at twenty different locations. The project was completed by local contractor 53 Corporation at a contract price of $172,000.

Program cost

The actual cost of this program varies from year-to-year, but $350,000 is budgeted annually.

More information

Residents are advised to contact Castle Rock Water with any concerns or questions.