Johor River Waterworks (JRWW) is located in Kotta Tinggi, Malaysia approximately 60 km north of Singapore. Under a water agreement with the Malaysian government, the Singapore government signed a 50 year agreement with the Public Utilities Board (PUB) to build, upgrade and operate the plant on the Johor River until the year 2050. Plants A and B were built between 1986 and 1999 and Plant C was constructed in 2001. With a combined capacity of 946 million liters per day (250 US MGD), the treated water is piped to Singapore and provides about 40% of the water for a population of 5.3 million people.
As a progressive organization known for being proactive to protect the public health, PUB decided to upgrade plants A and B with additional treatment including UV disinfection in accordance with stringent World Health Organization standards for Cryptosporidium inactivation in drinking water. Cryptosporidium is a chlorine resistant pathogenic protozoan known to have caused millions of illnesses worldwide but it is easily inactivated by germicidal UV light.