On his VDU's blog, Dr. Ian Mackay posts: H7N9 in the water and the goose stalls, in Guangzhou. Excerpt:
Via Twitter, Xinhuanet posted a story this evening that tests have identified influenza A(H7N9) virus in 2 poultry booths selling goose meat and an environmental sample of sewage water in a wet market in Zengcheng, Guangzhou, Guangdong Province.
The nature of the testing, reported by the local Center of Disease Control and Prevention (CDCP) is not specified so whether live virus was detected or viral nucleic acid is unclear. Finding influenza virus nucleic acids in the water of a live bird market in the current climate is not hard to believe - PCR being so sensitive and all - but whether it came from geese is not clear without more information.