| Acronym | Definition |
|---|
| MRWA | Main Roads Western Australia |
| MRWA | Minnesota Rural Water Association (Elbow Lake, MN) |
| MRWA | Michigan Rural Water Association (Harrison, MI) |
| MRWA | Missouri Rural Water Association |
| MRWA | Maine Rural Water Association |
| MRWA | Muskegon River Watershed Assembly (Big Rapids, MI) |
| MRWA | Mattabesset River Watershed Association (Connecticut) |
| MRWA | Manasquan River Watershed Association (Eatontown, New Jersey) |
| MRWA | Montour Run Watershed Association (Pittsburgh, PA) |
| MRWA | Mississippi Rural Water Association (Raymond, MS) |
| MRWA | Mystic River Watershed Association (Massachusetts) |
| MRWA | Maryland Rural Water Association |
| MRWA | Massachusetts Rural Water Association |
| MRWA | Mining Right of Way Act (Canada) |
| MRWA | Montana Rural Water Association |
| MRWA | Midland Railway of Western Australia |
| MRWA | Minnesota River Watershed Alliance (Mankato, MN) |