A South Australian public servant has been sacked after urinating in an office kettle.

The Department of Human Services employee was fired several months ago after a long-running investigation, the department confirmed on Wednesday.

In the video above: Delivery man caught urinating in a pot plant

As first reported by InDaily, a number of staff members have sought counselling and claim they have suffered post-traumatic stress from the incident, which occurred on March 12 last year.

Fellow workers had feared there was more than just pee in their tea, but that wasn't the case.

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"The investigation found that urine was present in a workplace kettle. No blood was found," a department spokeswoman told AAP.

"The thorough investigation found that a particular individual was at fault and this employee has since been terminated from the department."