Supply to the capital was cut by 20% on April 7 while work was carried out to repair a fault at the plant, which should produce 250Mg/d (946Ml/d).
The service cut was the second to take place in the last six months. The capital suffered a severe water shortage in December and January when the plant broke down following heavy rain that led its main supply to become contaminated with sediment.
Biwater completed the plant's expansion in 2009. An Idaan report showed the project was never properly completed, Panama Digital reported.