Canyon County contains 297 EPA-regulated facilities, 12 of which are currently flagged for significant noncompliance. The county also hosts 0 Superfund sites and 23 TRI chemical reporters. EPA has assessed $7.0M in lifetime penalties and TRI reporters disclosed roughly 1.2M lb of on-site releases. That facility count is well above the Idaho state average of 48 per county.
| Facility | City | On-site (lb) | Status |
|---|---|---|---|
| Amalgamated Sugar Company - Nampa | Nampa | 799.1k | Compliant |
| J R Simplot Company | Caldwell | 245.5k | Compliant |
| Best Bath Systems | Caldwell | 156.8k | Compliant |
| Icco Middelton | Caldwell | 1.8k | Compliant |
| Knife River | Nampa | 90 | Compliant |
| Amcor Precast | Nampa | 57 | Compliant |
| Darigold Caldwell Facility | Caldwell | 20 | Penalties |
| Simplot Western Stockmens Store And Mill | Caldwell | 20 | Penalties |
| Big Tex Trailers | Caldwell | 18 | Compliant |
| Dz Grinders Llc | Caldwell | 12 | Compliant |
| Plexus Corporation | Nampa | 2 | Compliant |
| Oldcastle Nampa Madison | Nampa | 1 | Compliant |
| Facility | City | Penalties | Last Inspected |
|---|---|---|---|
| J R Simplot Caldwell | Caldwell | $22.2k | 2024-03-21 |
| Alante Homes At Spring Run | Caldwell | $9.8k | 2024-03-27 |
| Drake Subdivision Well | Caldwell | $0 | |
| Shortstop Inc | $0 | ||
| Lkq Caldwell | Caldwell | $0 | 2025-07-24 |
| Middleton Wwtp | Middleton | $0 | 2022-09-28 |
| Silverhawk Aviation Academy, Llc | Caldwell | $0 | |
| Imc Greenleaf | Caldwell | $0 | |
| Caldwell Ms4, City Of | Caldwell | $0 | 2020-07-27 |
| Caldwell Wwtp | Caldwell | $0 | 2024-05-07 |
| Imc Look Lane | Caldwell | $0 | 2025-12-15 |
| Fleetwood Homes | Nampa | $0 | 2025-02-25 |