A break in a 30-inch water main along N.C. 55 reduced pressure for about 50,000 Cary customers and led 31 Wake County schools to dismiss early Monday. Pressure returned later in the day, but Cary advised affected customers to boil water as a precaution while samples were tested. The rupture closed lanes, interrupted school operations and triggered system-wide testing after crews isolated the damaged line.
Cary identified the failed pipe as a 30-inch transmission main near N.C. 55. The town estimated that roughly 50,000 customers experienced low or lost pressure. Wake County Public School System dismissed 31 schools early because normal water service could not be assured. Lane closures on N.C. 55 accompanied the repair work and affected traffic through the area.
Cary said system pressure returned after crews isolated the break. The town issued a precautionary boil-water advisory for customers who lost pressure. Officials said samples would be collected and tested the following morning. The initial engineering assessment pointed to a stress fracture, but the final cause had not been confirmed.
Pressure loss can allow contaminants to enter a distribution system even when no contamination has been detected. A precautionary advisory remains in place until required bacteriological testing supports lifting it. Large transmission mains serve multiple neighborhoods, so one failure can propagate across a broad service area. School dismissals were an operational response to water availability, not evidence of waterborne illness.
The record remains incomplete in defined ways. Test results were not available when the edition closed. The town had not issued a final engineering cause. The next observable steps are Cary’s notice lifting or extending the boil-water advisory. Repair completion and reopening of all affected lanes.