| CICargill Inc-sioux City-refinery | Sioux City | — | ◇ UNVERIFIED |
| CCCemstone Concrete Materials-algona | Algona | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Carroll | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Guthrie Center | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Adel | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Des Moines | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix Greenfield | Greenfield | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix - Plant #3 - Grimes | Grimes | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix Red Oak | Red Oak | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix Shenandoah | Shenandoah | — | ◇ UNVERIFIED |
| CRCohron Ready Mix-council Bluffs | Council Bluffs | — | ◇ UNVERIFIED |
| CIConcrete INC - Gifford | Union | — | ◇ UNVERIFIED |
| CTConcrete Technologies INC | Urbandale | — | ◇ UNVERIFIED |
| CTConcrete Technologies. INC | Grimes | — | ◇ UNVERIFIED |
| CCContinental Cement | West Des Moines | — | ◇ UNVERIFIED |
| CLCozzini Llc-iowa Manufacturing Facility | Algona | — | ◇ UNVERIFIED |
| CRCroell Redi-mix, INC - Decorah | Decorah | — | ◇ UNVERIFIED |
| CRCti Ready Mix, INC | Carlisle | — | ◇ UNVERIFIED |
| DPDukes Properties | Des Moines | — | ◇ UNVERIFIED |
| FCFlynn CO | Dubuque | — | ◇ UNVERIFIED |
| FCFlynn CO. INC. | Dubuque | — | ◇ UNVERIFIED |
| FCForterra Concrete Products - Cedar Rapids | Cedar Rapids | — | ◇ UNVERIFIED |
| GAGcc Alliance Concrete Inc-akron | Akron | — | ◇ UNVERIFIED |
| GAGcc Alliance Concrete Inc-sioux Center | Sioux Center | — | ◇ UNVERIFIED |
| GCGlen-gery CORP | Redfield | — | ◇ UNVERIFIED |
| GPGriffin Pipe Products Company | Council Bluffs | — | ◇ UNVERIFIED |
| HRHawkeye Ready-mix Maintenance Facility | Coralville | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix CO INC - Burlington | Burlington | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix CO INC - Keokuk | Keokuk | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix CO INC - Knoxville | Knoxville | — | ◇ UNVERIFIED |
| IIIpc INC | Des Moines | — | ◇ UNVERIFIED |
| KLKelderman Lime | Des Moines | — | ◇ UNVERIFIED |
| LHLiberty Holdings | Grimes | — | ◇ UNVERIFIED |
| MManatts | Bondurant | — | ◇ UNVERIFIED |
| MCManatts Concrete | Ankeny | — | ◇ UNVERIFIED |
| MIManatts, INC. | Walford | — | ◇ UNVERIFIED |
| MBMidwestern Bioag Holdings LLC | Davenport | — | ◇ UNVERIFIED |
| MRMoorhouse Ready Mix Inc-carroll | Carroll | — | ◇ UNVERIFIED |
| NINorwalk Iowa Ready Mix | Ankeny | — | ◇ UNVERIFIED |
| NRNorwalk Ready Mix | Des Moines | — | ◇ UNVERIFIED |
| SISpec-cast INC | Dyersville | — | ◇ UNVERIFIED |
| TMTunnel Mill Polymer, INC | Alden | — | ◇ UNVERIFIED |
| WWWilliams Wilbert Vault Works INC | Des Moines | — | ◇ UNVERIFIED |
| SR"4418 - Shell Rock Concrete Plant" | Shell Rock | 20–99 | ◐ LIKELY ACTIVE |
| SB"4419 - Shelby Bagging Plant" | Shelby | 20–99 | ◐ LIKELY ACTIVE |
| APAdel Plant | Adel | 20–99 | ◐ LIKELY ACTIVE |
| ANAfinitas- New Hampton location | New Hampton | 20–99 | ◐ LIKELY ACTIVE |
| CIC2 Iowa Des Moines Dixon Avenue | Des Moines | 1–19 | ◐ LIKELY ACTIVE |
| CPCalcium Products- Fort Dodge, IA Plant | Fort Dodge | 20–99 | ◐ LIKELY ACTIVE |
| CRCedar Rapids (1018) | Cedar Rapids | 20–99 | ◐ LIKELY ACTIVE |