Islanders have been asked to avoid Beaucette Marina after asbestos was discovered, following Tuesday evening's fire.
The fire engulfed a shed, but nobody was injured.
Health and Safety inspectors analysed the site, discovering asbestos debris. However, they say the risk to the public is low.
A specialist contractor is dealing with the contamination on behalf of the site owner. Do not attempt to do this yourself as you may become contaminated and could be exposed to asbestos fibres.
If you find any debris, do not touch it. Instead, call Ricky Stevens on 245000 who will arrange for it to be collected safely.

Guernsey rabbits at risk from two deadly diseases
Exhibition to celebrate 90 Years of Guernsey's Ambulance Service
Guernsey sewage pipe repairs "unlikely to be a quick"
Guernsey FC to fight for promotion at Victoria Park
Move to return St Julian's House to Guernsey's emergency shelter
Jersey and Guernsey included in UK-Gulf trade deal
St Pier says States put investigation before his experience in P&R seat vote
Industry leaders warn against paying Guernsey's under 18s the same as adults