| HMHarsco Metals | Muscatine | — | ◐ LIKELY ACTIVE |
| HPHawkeye Pedershaab Concrete Technologies, INC | Mediapolis | — | ◐ LIKELY ACTIVE |
| HRHawkeye Ready Mix Hiawatha | Hiawatha | 20–99 | ◐ LIKELY ACTIVE |
| HMHeidelberg Materials US Cement LLC (remediation Site) | Mason City | — | ◐ LIKELY ACTIVE |
| KRKing's Ready Mix | Cedar Rapids | 20–99 | ◐ LIKELY ACTIVE |
| MCMidland Concrete Products Clear Lake | Clear Lake | 20–99 | ◐ LIKELY ACTIVE |
| MEMPC Enterprises Inc | Mount Pleasant | 100–499 | ◐ LIKELY ACTIVE |
| RORail One USA CORP | Clinton | 1–19 | ◐ LIKELY ACTIVE |
| CICentral Iowa Ready Mix | West Des Moines | — | ◐ LIKELY ACTIVE |
| CMC.j. Moyna & Sons INC | Iowa | — | ◐ LIKELY ACTIVE |
| CCContinental Cement Company | Buffalo | — | ◐ LIKELY ACTIVE |
| GBGold Bond - Ftd Plant | Fort Dodge | — | ◐ LIKELY ACTIVE |
| HIHoffmann INC | Muscatine | — | ◐ LIKELY ACTIVE |
| HIHolcim (us) INC - Mason City | Mason City | — | ◐ LIKELY ACTIVE |
| MIManatts INC | Ankeny | — | ◐ LIKELY ACTIVE |
| MCMonarch Cement of Iowa INC | Des Moines | — | ◐ LIKELY ACTIVE |
| NRNorthwest Ready-mix | Ocheyedan | — | ◐ LIKELY ACTIVE |
| ACAmerican Concrete Products | Johnston | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products - Guthrie Center | Guthrie Center | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products INC | Adel | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products INC | Lakota | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products INC | Jefferson | — | ◇ UNVERIFIED |
| ACAmerican Concrete Products Incorporated | Mount Ayr | — | ◇ UNVERIFIED |
| APAndrews Prestressed Concrete INC | Clear Lake | — | ◇ UNVERIFIED |
| AAArch Aluminum & Glass CO INC | Bettendorf | — | ◇ UNVERIFIED |
| ARA-tec Recycling INC | Des Moines | — | ◇ UNVERIFIED |
| BMBard Materials | Dyersville | — | ◇ UNVERIFIED |
| BEBlended Equipment Solutions | Altoona | — | ◇ UNVERIFIED |
| CPCalcium Products INC | Fort Dodge | — | ◇ UNVERIFIED |
| CGCardinal Glass | Greenfield | — | ◇ UNVERIFIED |
| CICargill Inc-sioux City-refinery | Sioux City | — | ◇ UNVERIFIED |
| CRCemstone--clarion Ready Mix Plant | Clarion | — | ◇ UNVERIFIED |
| CCCemstone Concrete Materials-algona | Algona | — | ◇ UNVERIFIED |
| CCCemstone Concrete Materials-northwood | Northwood | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Adel | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Carroll | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Des Moines | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Guthrie Center | — | ◇ UNVERIFIED |
| CICentral Iowa Ready Mix | Boone | — | ◇ 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 |