It is believed that taking bath or sprinkling water of the tank on the bodies cleanses all the sins. Mahamaham has so far been celebrated five times since Independence.
- 1956 K. Kamaraj headed the government
- 1968 C.N. Annadurai headed the government
- 1980 the State was under President's rule
- 1992 J. Jayalalitha headed the government
- 2004 J. Jayalalitha headed the government
Instances of celebration of Mahamaham are found in records down the centuries, right from the Chola period to the British rule, under which substantial funds were sanctioned for the festival.
20 Theertham with in the Mahamaham Tank are:
1. Vayu Theertham
2. Ganga Theertham
3. Bramma Theertham
4. Yamuna Theertham
5. Kubera Theertham
6. Godavari Theertham
7. Eshana Theertham
8. Narmada Theertham
9. Saraswathi Theertham
10. Indira Theertham
11. Agni Theertham
12. Cauvery Theertham
13. Yama Theertham
14. Kumari Theertham
15. Niruthi Theertham
16. Bayoshni Theertham
17. Deva Theertham
18. Varunai Theertham
19. Sarayu Theertham
20. Kanya Theertham
On the occasion of the festival, a metal image of the deities of the main temples of Kumbakonam is carried on palanquins or chariots and taken around the different streets of the town.
The Mahamaham Festival occurs when the sun is in the Zodiacal sign of Aquarius (Khumbha), Jupiter transists Leo (Simha) and the Moon is in conjunction with the constellation Maham. The festival comes off once in 12 years.
Siva Linga around the Mahamaham Tank are:
1. Brammatheertheshwarar
2. Mukundeshwarar
3. Dhaneshwarar
4. Virushabeshwarar
5. Baaneshwarar
6. Koneshwarar
7. Bhakthikeshwarar
8. Bhairaveshwarar
9. Agasthyeshwarar
10. Vyaneshwarar
11. Umaibakeshwarar
12. Nairutheeshwarar
13. Brammeshwarar
14. Gangatheshwarar
15. Mukthatheertheshwarar
16. Shethrabaleshwarar
The festival was celeberated on February 2, 1968, March 1, 1980, February 22,1992. The last Mahamaham was celebrated on March 6, 2004, with people from various places taking the holy dip in the Mahamaham tank. The next Mahamaham will be celebrated in the year 2016.