Duncan Brothers INC
21516 Main St, Grand Terrace, CA 92316
UNVERIFIEDLAST SEEN IN FEDERAL DATA — · 2 SOURCES
Present in a source dataset, with no recent operating signal.
What they make
All Other Miscellaneous Fabricated Metal Product Manufacturing332999Where it is
34.01931, -117.33448 · CENSUS TIGER
Other plants nearby
| Facility | City | Industry | Status | Distance |
|---|---|---|---|---|
| Surfa Slick LLC | Riverside | Saw Blade and Handtool Manufacturing 332216 | UNVERIFIED | 1.6 KM |
| Jpjw Ventures LLC Dba Pirtek Corona | Riverside | Fluid Power Valve and Hose Fitting Manufacturing 332912 | UNVERIFIED | 2.1 KM |
| US Precision Sheet Metal, INC. | Riverside | Sheet Metal Work Manufacturing 332322 | ACTIVE | 2.9 KM |
| Marlin Machine Products | Riverside | Machine Shops 332710 | ACTIVE | 3.0 KM |
| Tracy Lynn Oakley & David Jonathan Burke | Colton | All Other Miscellaneous Fabricated Metal Product Manufacturing 332999 | UNVERIFIED | 3.6 KM |
Also at this address
No other federal record shares this street address.
WHERE THIS RECORD COMES FROM — 2 FEDERAL SOURCES, 5 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 AIR, NPDES · EPA site type STATIONARY.
| Source | Evidence | First seen | Last seen |
|---|---|---|---|
| EPA ECHO | OPERATING | MAY 2019 | MAY 2019 |
| EPA FRS | EXISTENCE | MAY 2015 | MAY 2015 |
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 |
| STATE | EPA FRS | JUL 2026 |
Status is computed from independent sources; nothing here is self-reported unless marked Claimed.