The Enforcement Rules of the Prison Act Article 41

Prisons shall exercise care to environmental health. Each Prison shall determine the period of regular environment health inspection in accordance with Article 51 of the Act based on the local situations. Such inspection shall be performed at least twice every year.Prisons may ask local health, environmental protection authorities (agencies) or relevant authorities (agencies) to assist with the environmental health inspection under the preceding paragraph and may undertake required and feasible improvement measures immediately or gradually based on the requirements of health, environmental protection or other relevant equipment (facilities).Prisoners shall cooperate with environmental cleaning work in Prisons to maintain public and personal hygiene.
中文原文 監獄行刑法施行細則第41條
監獄應注意環境衛生。
依本法第五十一條定期舉行之環境衛生檢查,其期間由各監獄依當地狀況定之,每年不得少於二次。
前項環境衛生檢查,監獄得請當地衛生、環境保護機關(單位)或相關機關(單位)協助辦理;並就衛生、環境保護及其他有關設備(施)之需求,即時或逐步採取必要、可行之改善措施。
受刑人應配合監獄執行環境清潔工作,維持公共及個人衛生。

English translation for reference only; the Chinese text prevails. Not legal advice.