United Water manages wastewater treatment facilities in the following municipalities (these treatment facilities may also handle wastewater -- sewage -- in neighboring communities):
- East Providence (and Barrington, Central Falls, Cumberland, Lincoln, Pawtucket, Smithfield)
- Newport (and Middletown)
- Pawtucket
- Wakefield (South Kingstown and part of Narragansett - including URI)
- Warren
- Westerly