Optimization tidal swamps acid sulfate soil is an alternative solution in increasing rice productivity to overcome a food crisis threat. Water management is the primary key to be successful in agriculture on tidal swamps. This study aims to recognize the dynamics of tidal water quality in secondary and tertiary canals for rice plants’ irrigation in the transition season. The measurement starts from the peak of the dry season to the peak of the rainy season, which is carried out every month at the tidal peak. Measurements consist of 1) every hour for 24 hours in the secondary canal at the point 3km from the Barito river. 2) Every 1 kilometer from the edge of the Barito river to a distance of 8 km at peak tide and neap tide. 3) Every 50m from 0-450m in the tertiary canal also at peak tides and neap tide. The main parameters measured are pH and Electro conductivity (EC). The results show that water quality fluctuations are very contrasting between the salinity transition to extreme acidity.  The further away from the Barito river, the secondary water channel quality decreases, and the further away from the secondary channel, the tertiary canal water quality also decreases. Not all tides that overflow their land are of good quality. The best water quality for the irrigation of rice plants is at peak tides which occur around 7-9 hours after the start of the tides.