EPA-regulated facilities near Mason, OH

There are 385 EPA-regulated facilities within 5 miles of Mason, Ohio. The most common kinds are hazardous waste (198), water discharge (135), air emissions (66). 1 is currently in significant noncompliance, the EPA's designation for the most serious or persistent violations, and 6 have a violation on record. Penalties over the last five years total $10k across 1 site.

Open the map here

385facilities within 5 miles

1in significant noncompliance

6with a violation on record

$10kin penalties, last 5 years

By category

Category	Facilities
Hazardous waste	198
Large quantity generators	4
Small quantity generators	104
Transporters	2
Chemical (RMP/TRI)	34
Superfund	5
Air emissions	66
Major sources	4
Synthetic minor sources	11
Minor sources	39
Water discharge	135
Major permits	3
Minor permits	7
Drinking water systems	6
Greenhouse gas reporters	1
Data centers	4
Scrap yards	3
Recycling centers	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.

LA MARKETA 9393 FIELDS ERTEL RD., CINCINNATI, OH, 45249 · 4.9 mi Significant noncompliance

Largest penalties

Penalties assessed over the last five years.

BOGG EXPRESS LLC 7577 CENTRAL PARKE BLVD STE 129, MASON, OH, 45040 · 2.4 mi $10k in penalties

Superfund sites

MASON ROAD LEAD SITE 4631 HICKORY WOODS DRIVE, MASON, OH, 45040 · 1.6 mi
KINGS MILLS LEAD SITE 5620 COLUMBIA RD, KINGS MILLS, OH, 45034 · 2.2 mi
PETERS CARTRIDGE FACTORY 1415 GRANDIN ROAD, KINGS MILLS, OH, 45034 · 3.0 mi
KINGS MILLS MILITARY RESERVATION 6195 STRIKER ROAD, HAMILTON TOWNSHIP, OH, 45034 · 3.3 mi
STRIKER ROAD DRUM SITE 6451 STRIKER RD, MAINEVILLE, OH, 45039 · 3.3 mi

Data centers

CyrusOne Cincinnati-Mason CIN3 · 4.0 mi
Unnamed data center (OSM) 401 Kingsview Drive, Lebanon · 4.4 mi
Unnamed data center (OSM) 401 Kingsview Drive, Lebanon · 4.4 mi
CYRUSONE LLC - LEBANON DATA CENTER (1483000509) 401 KINGSVIEW DR, LEBANON, OH, 45036 · 4.8 mi

County

Warren County

Nearby towns

Lebanon 6 mi
Loveland 7 mi
Monroe 7 mi
Montgomery 8 mi
Sharonville 8 mi
Blue Ash 9 mi
Middletown 10 mi
Springdale 11 mi

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 as the Census Bureau records it. The Data page explains where each record comes from and how it can mislead.