Trade mark "Flag" is also considered as a famous brand in Fujian. All the products of Sea100 have got the QS quality and safety certification.

“蓝旗”牌商标被评为福建省著名商标，所有产品均已通过QS质量安全认证。

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That would seem to indicate that no safety flag was raised.

FORBES: Magazine Article

But what is his view of the safety fears over flying the flag?

BBC: NEWS | UK | England | The fight to keep flying the flag

Any British beach flying the flag has to pass the most stringent tests on beach management and safety.

BBC: Eight NI beaches win blue flags