EPA-regulated facilities near Mason City, IA
There are 227 EPA-regulated facilities within 5 miles of Mason City, Iowa. The most common kinds are hazardous waste (141), air emissions (61), water discharge (48). 1 is currently in significant noncompliance, the EPA's designation for the most serious or persistent violations, and 4 have a violation on record. Penalties over the last five years total $5.5M across 4 sites.
By category
| Category | Facilities |
|---|---|
| Hazardous waste | 141 |
| Treatment, storage or disposal | 1 |
| Large quantity generators | 3 |
| Small quantity generators | 71 |
| Chemical (RMP/TRI) | 26 |
| Superfund | 5 |
| Air emissions | 61 |
| Major sources | 6 |
| Synthetic minor sources | 19 |
| Minor sources | 24 |
| Water discharge | 48 |
| Major permits | 1 |
| Minor permits | 5 |
| Drinking water systems | 8 |
| Greenhouse gas reporters | 2 |
| Scrap yards | 1 |
A facility enrolled in several programs counts once in the total and once in each of its categories.
In significant noncompliance
The EPA's designation for its most serious or persistent violations, as of the latest data.
- HEIDELBERG MATERIALS US CEMENT LLC (REMEDIATION SITE) Significant noncompliance · $198k in penalties
Largest penalties
Penalties assessed over the last five years.
- UNITED PARCEL SERVICE $5.3M in penalties
- WOODHARBOR CUSTOM CABINETRY $14k in penalties
- CURRIES DIVISION OF AADG, INC - 12TH ST NW $12k in penalties
Superfund sites
- MASON CITY COAL GASIFICATION PLANT
- VOC FORMER MARSHALL & SWIFT CLEANERS
- EVANS PRESERVE
- NORTHWESTERN STATES PORTLAND CEMENT CO.
- LEHIGH CEMENT CO - MASON CITY FACILITY
County
Nearby towns
Reading these numbers
These are regulatory records, not measurements of pollution. Most facilities appear because they hold a permit or file reports, and most of them are compliant; a listing is not a claim that a facility has polluted anything. Compliance status and penalties are the EPA's own determinations in data retrieved Oct 9, 2026. Distances are from the center of Mason City as the Census Bureau records it. The Data page explains where each record comes from and how it can mislead.