| Business | Phone |
| St Clair Rvr Sewer Auth 5906 Urban Dr, East China 48054 | (810) 765-5169 |
| St Clair Rvr Sewer Auth 3424 Saint Clair Hwy, East China 48054 | (810) 329-7238 |
| St Clair Rvr Sewer Auth 3540 River Rd, East China 48054 | (810) 329-7282 |
| St Clair Rvr Sewer Auth 4156 River Rd, East China 48054 | (810) 329-7288 |