Leighton Andrews AM visits flood-hit Treorchy streets
15 December 2013 Last updated at 12:58 GMT
Up to 30 homes in Treorchy have been evacuated after flash flooding when a pumping station failed during heavy rainfall on Saturday night.
Dwr Cymru Welsh Water said the problem had been fixed, and said it was "extremely sorry" to those affected.
An emergency centre was set up at Rhondda leisure centre by Rhondda Cynon Taf council.
Rhondda assembly member Leighton Andrews said he had spoken to a number of residents and "clearly many have suffered significant damage in the run-up to Christmas".
Mr Andrews, who has seen inside two of the homes affected, said Welsh Water had accepted it was their responsibility to compensate residents.