Officially operational in 2020, SPAM Regional Petanglong is capable of producing 200 liters/second of water. SPAM Regional Petanglong utilizes the surface water flow of the Sumilir River in the Kupang watershed which is then processed at the Krompeng Water Treatment Plant (IPA) to meet raw water needs in Pekalongan Regency, Pekalongan City, and Batang Regency. With the operation of SPAM Regional Petanglong, it is expected to be a solution to the problem of land subsidence caused by the massive use of deep groundwater sources.