一級工人的主要職責為：
(a) 農業分署：(i) 與種植作物有關的體力勞動工作；(ii) 農場／辦公室的清潔及一般保養維修工作；以及 (iii) 操作和保養農用機械。
(b) 自然護理分署和郊野公園及海岸公園分署：(i) 與建造和維修行人徑、康樂地區及設施有關的體力勞動工作；(ii) 種植、護理和砍伐樹木、剪草；(iii) 撲滅山火；(iv) 收集和處置垃圾；以及(v) 收集、運送和儲存備用品，並負責機械工具的清理及一般維修工作。
(c) 檢驗及檢疫分署：(i) 飼養動物的日常工作；(ii) 處理、約束和捕捉動物；(iii) 準備和保養捕捉動物的裝備；(iv) 政府樓宇、獸醫實驗室及車輛的一般保養及清潔工作；以及(v) 與執法行動有關的體力勞動工作。
(d) 漁業分署：(i) 捕魚和養魚方面的日常工作；(ii) 裝備及備用品的保養工作；(iii) 與執法行動有關的體力勞動工作；以及(iv) 漁業分站的清潔／一般保養維修工作。

(註：可能須在交通不便的偏遠地區工作；穿着制服；不定時工作及／或輪班工作；以及在惡劣天氣或颱風期間當值。)

A Workman I is mainly deployed on –
(a) Agriculture Branch：(i) manual work associated with crop farming; (ii) cleansing and general maintenance/repair work of farms/offices; and (iii) operating and maintaining farm machinery.
(b) Conservation Branch and Country and Marine Parks Branch：(i) manual work associated with construction and maintenance of footpaths as well as recreational areas and facilities; (ii) tree planting, tending and felling as well as grass cutting; (iii) hill fire fighting; (iv) litter collection and disposal; and (v) collection, delivery and stocking of store items as well as cleansing and general maintenance of mechanical tools.
(c) Inspection and Quarantine Branch：(i) routine work in animal rearing; (ii) handling, restraining and catching of animals; (iii) preparation and maintenance of animal catching equipment; (iv) general maintenance and cleansing work for Government premises, veterinary laboratory and vehicles; and (v) manual work associated with law enforcement activities.
(d) Fisheries Branch：(i) routine work in fishing and fish rearing; (ii) maintenance of equipment and stores; (iii) manual work associated with law enforcement activities; and (iv) cleansing/general maintenance repair work of fisheries sub-stations.

(Note: May be required to work in remote places with difficult access; wear uniform; work irregular hours and/or perform shift duties; and be on duty during typhoon or in inclement weather.)