We found 77 public water systems in Whitman county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Washington State University | Pullman | 25,824 | 13 | 10 |
| Pullman Water Department, City Of | Pullman | 25,591 | 40 | 6 |
| Colfax Water Department, City Of | County of Whitman | 3,563 | 0 | 23 |
| Palouse Water Dept, City Of | County of Whitman | 1,169 | 0 | 32 |
| Tekoa, City Of | County of Whitman | 1,036 | 0 | 48 |
| Boyer Park & Marina | County of Whitman | 955 | 0 | 7 |
| Rosalia, Town Of | County of Whitman | 831 | 0 | 30 |
| Horn School Rest Area | County of Whitman | 801 | 0 | 2 |
| St John, Town Of | County of Whitman | 800 | 0 | 22 |
| Palouse Empire Fairgrounds | County of Whitman | 733 | 0 | 13 |
| Garfield Water Department | County of Whitman | 694 | 0 | 12 |
| Colton Water Department | County of Whitman | 643 | 0 | 32 |
| Albion Water Dept | County of Whitman | 555 | 0 | 10 |
| Endicott Water Dept | County of Whitman | 488 | 0 | 86 |
| Oakesdale, Town Of | County of Whitman | 420 | 0 | 29 |
| Central Ferry State Park | County of Whitman | 416 | 0 | 0 |
| Evangelical Free Church | County of Whitman | 404 | 0 | 3 |
| Uniontown Water Works | County of Whitman | 324 | 0 | 30 |
| Lacrosse, Town Of | County of Whitman | 297 | 0 | 23 |
| System #2 - Kinsinger | County of Whitman | 244 | 0 | 0 |
| Malden Water Dept | County of Whitman | 215 | 0 | 16 |
| Steptoe Water/sewer District | County of Whitman | 210 | 0 | 102 |
| Kamiak Butte County Park | County of Whitman | 201 | 0 | 12 |
| Pullman Moscow Regional Airport | County of Whitman | 184 | 0 | 0 |
| Klemgard County Park | County of Whitman | 157 | 0 | 3 |
| Wawawai County Park | County of Whitman | 154 | 0 | 11 |
| Farmington Water Dept | County of Whitman | 142 | 0 | 11 |
| Lamont Water System | County of Whitman | 136 | 0 | 68 |
| Steptoe Butte State Park | County of Whitman | 117 | 0 | 0 |
| Wilma, Port Of | Clarkston | 108 | 0 | 0 |
| Central Ferry Park | County of Whitman | 101 | 0 | 0 |
| Bellevue Duplexes | County of Whitman | 90 | 0 | 0 |
| Country Bible Church | County of Whitman | 76 | 0 | 0 |
| System #2 Kinsinger (wheel Inn) | County of Whitman | 73 | 0 | 0 |
| Whitman County Landfill | County of Whitman | 60 | 0 | 0 |
| Evergreen Homeowners Association | County of Whitman | 58 | 0 | 0 |
| Toyota Of Pullman | County of Whitman | 53 | 0 | 0 |
| Sunset Mobile Court | County of Whitman | 51 | 0 | 0 |
| Steptoe Water System | County of Whitman | 50 | 0 | 0 |
| Onecho Bible Church | County of Whitman | 49 | 0 | 0 |
| Lamont School District #264 | County of Whitman | 45 | 0 | 0 |
| Smoot Hill Biol Field Study Area | County of Whitman | 45 | 0 | 0 |
| Dusty Country Store | County of Whitman | 41 | 0 | 0 |
| Dusty Cafe | County of Whitman | 41 | 0 | 0 |
| Tula Young Hastings Farm - Wsu | County of Whitman | 39 | 0 | 0 |
| Mcgregor Office Complex | County of Whitman | 35 | 0 | 0 |
| Colfax Lds Church | County of Whitman | 35 | 0 | 0 |
| Thornton W Supply | County of Whitman | 35 | 0 | 0 |
| Washington Water Power Co | County of Whitman | 31 | 0 | 0 |
| Colfax Maintenance - Dot | County of Whitman | 30 | 0 | 0 |
| Hooper Water | County of Whitman | 30 | 0 | 0 |
| Port Central Ferry Dwelling | County of Whitman | 27 | 0 | 0 |
| Canyon Creek Court | County of Whitman | 25 | 0 | 0 |
| Ewan Water Association | County of Whitman | 25 | 0 | 0 |
| Spillman Farm | County of Whitman | 25 | 0 | 0 |
| West Wynn Apt Complex | County of Whitman | 25 | 0 | 0 |
| Valley Cement | County of Whitman | 25 | 0 | 0 |
| Whitman Co Port Of Industrial Park | County of Whitman | 25 | 0 | 0 |
| Grange #118 | County of Whitman | 25 | 0 | 0 |
| Arrow Machinery | County of Whitman | 20 | 0 | 0 |
| Bob Alderman Water | County of Whitman | 20 | 0 | 0 |
| System #1 Kinsinger | County of Whitman | 20 | 0 | 0 |
| Hinrichs Farm | County of Whitman | 18 | 0 | 0 |
| Curtis System | County of Whitman | 18 | 0 | 0 |
| Colfax County Shop | County of Whitman | 18 | 0 | 0 |
| Whitman County Mem Airport | County of Whitman | 12 | 0 | 0 |
| Wheatland Express | County of Whitman | 11 | 0 | 0 |
| Summit Quarry Water System | County of Whitman | 10 | 0 | 0 |
| Dusty Farm Co-op | County of Whitman | 9 | 0 | 0 |
| Alpine Wonder Motley Well Assn | County of Whitman | 7 | 0 | 0 |
| High School Student Amb Program | County of Whitman | 6 | 0 | 0 |
| Almota Elevator Company | County of Whitman | 6 | 0 | 0 |
| Huber Well | County of Whitman | 2 | 0 | 0 |
| Gilchrist Water System | County of Whitman | 2 | 0 | 0 |
| Steptoe School District #304 | County of Whitman | 2 | 0 | 0 |
| Selbu Lutheran Church | County of Whitman | 2 | 0 | 0 |
| Riverview Subdivision Water System | County of Whitman | 1 | 0 | 0 |