The Great Blessing of the Waters (Megas Agiasmos)
Epiphany, one of the oldest and most important Feast days of the Orthodox Church, commemorates the manifestation of the Holy Trinity which took place at the Baptism of Christ in the Jordan River. Recognizing rich meaning in this event, Orthodoxy believes that when Christ was baptized, it not only marked the beginning of its public ministry and revealed the Trinity, but also signified that the entire creation is destined to share in the glory of redemption in Christ. While Christ entered into the Jordan to be baptized, two things were happening: He was identifying Himself with the people He had come to save; and, He was identifying Himself with the whole of Creation which was represented by water. Through His baptism, the Lord revealed the value of the created world and He redirected it toward its Creator. Creation is good and it belongs to God.
The Great Blessing of Water is held on the eve of the Feast of the Epiphany and on the day itself, following the Divine Liturgy. The Blessing not only remembers the event of Our Lord's baptism and the revelation of the Holy Trinity but also expresses Orthodoxy's belief that creation is sanctified through Christ. The Blessing affirms that humanity and the created world, of which we are a part, were created to be filled with the sanctifying presence of God. After the solemn blessing, the Holy Water is distributed to the faithful and is used to bless homes during the Epiphany season. When the faithful drink the "Epiphany Water," we are reminded of our own baptism. When the Church blesses an individual, or object, or event with the water, we are affirming that those baptized, their surroundings, and their responsibilities are sanctified through Christ and brought into the Kingdom of the Father through the Spirit.
In addition to the Great Blessing of Water, there is a Lesser Blessing of Water service which can take place at any time. Usually, it is celebrated when a home is blessed, on the first day of the month, the beginning of the school year, and beginning of new responsibilities.