Water alkalinity, a measure of river contamination, was already above normal in the major waterway, the official said.
Samples taken at the confluence of the Raab river and the Danube showed "alkalinity slightly above nornal, around 8.96 per cent to 9.07 per cent'', against a normal tally of eight per cent, the source said.
A wave of toxic mud was unleashed on Monday from the reservoir of an aluminium plant at Ajka, 160km west of Budapest.
The red mud travelled down the Raab river and reached the Danube waters at around 0630 GMT (1730 AEDT) at Gyor.
The industrial accident triggered by the collapse of walls at the factory reservoir on Monday has been described as an ecological disaster and is now threatening the entire ecosystem of the Danube, Europe's second longest river.
The wave of toxic sludge that has poured into seven villages in Hungary could take up to 12 months and tens of millions of dollars to clean up, officials have warned.
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