We found 46 public water systems in Keweenaw county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Fort Wilkins State Park | County of Keweenaw | 3,450 | 0 | 0 |
| Mohawk-fulton | County of Keweenaw | 930 | 0 | 0 |
| Keweenaw Mountain Lodge | Copper Harbor | 465 | 0 | 10 |
| Isle Royale-rock Harbor | Houghton | 335 | 0 | 1 |
| Ahmeek Location | County of Keweenaw | 330 | 0 | 0 |
| Fort Wilkins State Park | Copper Harbor | 225 | 0 | 5 |
| Johnson's Bakery & Restaurant | County of Keweenaw | 200 | 0 | 0 |
| Johnson Bakery & Restaurant | County of Keweenaw | 200 | 0 | 0 |
| Mount Bohemia Ski Resort | Mohawk | 200 | 0 | 5 |
| Harbor Haus Restaurant | County of Keweenaw | 200 | 0 | 0 |
| Ahmeek | Ahmeek | 148 | 0 | 13 |
| Isle Royale - Windigo | Houghton | 115 | 0 | 0 |
| Keweenaw Mountain Lodge | County of Keweenaw | 100 | 0 | 0 |
| Keweenaw Mountain Lodge | County of Keweenaw | 100 | 0 | 0 |
| Lac La Belle Lodge, Inc. | Mohawk | 100 | 0 | 0 |
| Esrey Park R 38 | County of Keweenaw | 100 | 0 | 0 |
| M.d.o.t.- Hebbard, P137 | County of Keweenaw | 100 | 0 | 0 |
| New Alleouz Location | County of Keweenaw | 90 | 0 | 0 |
| Old Alleouz Location | County of Keweenaw | 90 | 0 | 0 |
| Grant Township - Copper Harbor | Copper Harbor | 90 | 0 | 0 |
| Fanny Hooe Motel | County of Keweenaw | 84 | 0 | 0 |
| Keweenaw Academy | County of Keweenaw | 80 | 0 | 0 |
| Eagle Harbor Township | Eagle Harbor | 80 | 0 | 0 |
| Cliffview Inn | Phoenix | 75 | 0 | 0 |
| Isle Royale - Mott Island | Houghton | 75 | 0 | 0 |
| Fort Wilkins St Pk West Cpgd | County of Keweenaw | 50 | 0 | 0 |
| Sunset Bay Campground | Ahmeek | 50 | 0 | 0 |
| Aqua Log Cabins - Black Bear Inc. | Houghton | 44 | 0 | 0 |
| Gay Bar | County of Keweenaw | 40 | 0 | 0 |
| Houghton Township | Eagle River | 40 | 0 | 0 |
| Sherman Township | Gay | 40 | 0 | 0 |
| Eagle Lodge | Eagle Harbor | 36 | 0 | 0 |
| Norland Motel | County of Keweenaw | 33 | 0 | 0 |
| Mariner North | County of Keweenaw | 30 | 0 | 0 |
| Lacla Belle Resort | County of Keweenaw | 30 | 0 | 0 |
| Vansville Inn | Mohawk | 30 | 0 | 0 |
| Norland Motel | County of Keweenaw | 30 | 0 | 0 |
| The Gay Bar | Gay | 25 | 0 | 0 |
| Grant Township School | County of Keweenaw | 25 | 0 | 0 |
| Usfs Dobson Bridge Cg | Hoxeyville | 25 | 0 | 0 |
| Harbor Heights Campground | County of Keweenaw | 25 | 0 | 0 |
| Copper Harbor Water Supply | County of Keweenaw | 25 | 0 | 0 |
| Red Sands Resort | County of Keweenaw | 25 | 0 | 0 |
| Daisy Farm | County of Keweenaw | 25 | 0 | 0 |
| Esrey Park Wayside P138 (mdot) | Eagle Harbor | 25 | 0 | 0 |
| Lakeside Lodge | County of Keweenaw | 25 | 0 | 0 |