Another advocate of proactive management of PCCP is the San Diego County Water Authority (SDCWA). SDCWA is considered an industry leader in proactive management of PCCP pipelines. SDCWA’s first pipelines were constructed in the late 1940s, and the aqueduct system expanded, on average, by 4.5 miles per year until 2015. The system has 308 miles of large diameter pipeline. Of that, 80 miles is PCCP.