inset appointees water.suppl.

[julan4i4ik]

Контекст:
Water suppliers
These include water undertakers, inset appointees, and combined licensees - see The Water Act 2003 (Consequential and Supplementary Provisions) Regulations 2005, together with private drinking water suppliers.

Я перевела как "новые назначенные лица", но это не совсем то...

[алешаBG]

если поможет:
Definition - Inset appointee/Inset
A company that replaces the undertaker for a specific geographic area within the area of an existing undertaker. This usually happens where the customers are “unserved” (such as on a new development) or qualify as large users (i.e. they expect to use more than 50Ml in England or 250Ml in Wales – for example a paper mill). The inset regime is sometimes known as new appointments and variations (NAVs). However, the term “NAV” also refers to a variation of the appointment area of an incumbent water company, for example when incumbent water companies agree to change the boundaries between them.

[2eastman]

субподрядчики?

[julan4i4ik]

возможно,
я потом их оставила как "альтернативные предприятие по водоснабжению"