Vandals who keep targeting the same company have been warned they are extremely dangerous and irresponsible.
The Southern Water premises in Western Road, East Worthing, have been plagued by vandals and thieves over the past few months.
Police said there were safety concerns at the waterworks as there are deep pits in the grounds containing toxic waste.
A police spokesman said: "To those breaking in - your actions are extremely dangerous and irresponsible."
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules hereComments are closed on this article