| Business | Phone |
| Greenfield Waste Water Plant 601 Se 4th St, Greenfield 50849 | (641) 743-2334 |
| Greenfield Water Plant 2124 240th Ln, Greenfield 50849 | (641) 743-6642 |
| Greenfield Water Plant Rt 2, Greenfield 50849 | (641) 743-6642 |
| Greenfield Water Plant Sw Mills, Greenfield 50849 | (641) 743-6642 |