Keystone Engineering Company
1600 Excise Ave, Ontario, CA 91761
UNVERIFIEDLAST SEEN IN FEDERAL DATA — · 1 SOURCE
Present in a source dataset, with no recent operating signal.
What they make
Other Aircraft Parts and Auxiliary Equipment Manufacturing336413Where it is
34.04413, -117.57822 · CENSUS TIGER
COUNTY
METRO AREA
ON GOOGLE MAPS
Other plants nearby
| Facility | City | Industry | Status | Distance |
|---|---|---|---|---|
| Jcm Engineering CORP | Ontario | Machine Shops 332710 | LIKELY ACTIVE | 1.6 KM |
| Mmg CORP | Ontario | Machine Shops 332710 | ACTIVE | 1.9 KM |
| Diagnostic Solutions International LLC | Ontario | Other Aircraft Parts and Auxiliary Equipment Manufacturing 336413 | ACTIVE | 2.0 KM |
| Certified Aviation Services, LLC | Ontario | Other Aircraft Parts and Auxiliary Equipment Manufacturing 336413 | ACTIVE | 2.3 KM |
| Castle Industries INC. of Ca. | Ontario | Sheet Metal Work Manufacturing 332322 | UNVERIFIED | 2.2 KM |
Also at this address
No other federal record shares this street address.
WHERE THIS RECORD COMES FROM — 1 FEDERAL SOURCE, 6 FIELDS
Every fact on this page traces to a public federal filing. The table below names which register holds this facility, whether that register proves the plant operates or only that it exists, and when each of them last saw it.
EPA cross-references this facility in RCRAINFO · EPA site type STATIONARY.
| Source | Evidence | First seen | Last seen |
|---|---|---|---|
| EPA FRS | EXISTENCE | JAN 2019 | JAN 2019 |
FIELD BY FIELD — WHICH SOURCE SUPPLIED WHAT
| FIELD | SOURCE | SIGNAL |
|---|---|---|
| ADDRESS LINE1 | EPA FRS | JUL 2026 |
| CITY | EPA FRS | JUL 2026 |
| GEOM | EPA FRS | JUL 2026 |
| NAME | EPA FRS | JUL 2026 |
| RCRA GENERATOR STATUS | EPA ECHO | AUG 2026 |
| STATE | EPA FRS | JUL 2026 |
Status is computed from independent sources; nothing here is self-reported unless marked Claimed.