The toilet has now been removed and the hut will serve as a tourist office.
The story made headlines in Cambodia, where fewer than 40% of people in rural areas have access to toilets.
The toilet, housed in a specially constructed air-conditioned hut, was set up for Ms Sirindhorn two-hour visit to the north-eastern lake on Monday, reportedly at her request.
"She [the Princess] did not go inside the bathroom, she just looked at it from outside and took some pictures," community leader Ven Churk told the AFP news agency.
The price tag covers the cost of the whole building which, he says, has been given to the community to be used as a tourist office.
It was paid for by the Thais, Cambodian officials added.
The toilet`s construction was carried out by the Siam Cement Group (SCG), a Thai construction giant partly owned by a company that manages the Thai royal family`s assets and investments, local media reported.
SCG could not be reached for comment.
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