I'd like to step up and take responsibility for clogging the {office/school/etc.} toilet on {date}. I wasn't aware that the plumbing was such that we shouldn't flush {hygiene product/toilet paper/etc.}.
Perhaps it would be helpful if a sign were posted in the restroom so that {employees/students/clients/guests/etc.} will know how sensitive our toilet can be.
I hope that the cost for the plumber was not too extreme. I'd also like to mention that it was not necessary to {call out the staff/cast blame/require someone to come forward or the entire office would be "punished"} regarding such a sensitive issue.
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