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.)