Mark Richardson shocked his co-hosts on The AM show this morning with a stinky revelation.

But The Block New Zealand presenter could be in deeper water than he realises.

Richardson disgusted co-hosts Duncan Garner and Amanda Gillies by revealing he defecated into the ocean off the back of his jet ski over the weekend.

"I was out on the jet ski on Sunday and when I got out there I - I'd had Mexican the night before," he said.

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Mark Richardson and Amanda Gillies on The AM Show.
Mark Richardson and Amanda Gillies on The AM Show.

"I was probably in international waters. I was probably in Australian territory to tell you the truth, I was that far out. I had wetsuit trousers on... I pulled them down and I balanced on the edge of the jet ski, holding onto the steering handle and managed to do my business."

Gillies leaned back in her chair at Richardson's story before telling him it was "revolting".

Garner said it was "probably illegal" - and he may be right.

The Auckland Council told the Herald that under Auckland Unitary Plan guidelines, disposal of untreated sewage from a vessel into the ocean in all bays and inlets is banned.

That rule covers all areas within 500 metres from shore and in water less than five metres deep.

The AM show with Mark Richardson, Amanda Gillies and Duncan Garner.
The AM show with Mark Richardson, Amanda Gillies and Duncan Garner.

The act is also not permitted within 500 metres of an "aquaculture activity and Mātaitai Reserve," 500 metres from high water springs and 200 metres from a marine reserve.

Discharged untreated waste that does not meet these requirements is a prohibited act under the Resource Management Act 1991.

If Richardson were to be found breaking these rules, he could be liable for a fine of up to $2000.

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* Three is yet to respond to Herald request for comment.