Doble Engineering Company (Ontario, CA)

What they make

• condition monitoring
• electrical test instruments
• high power test systems
• tests
• circuit breakers
• transformers
• cables
• overhead lines
• rotating machines
• insulating materials
• DC HIPOT/Insulation

NAMED ON THE COMPANY’S OWN WEBSITE, READ JUL 29, 2026

Where it is

Other plants nearby

Facility	City	Industry	Status	Distance
Otto Instrument Service, INC.	Ontario	Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing 334511	● ACTIVE	0.7 KM
BAB a E Systems	Ontario	Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing 334511	◇ UNVERIFIED	1.1 KM
WOWebasto Ontario	Ontario	Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals 334515	◐ LIKELY ACTIVE	1.3 KM
Mpm Products, INC	Ontario	Photographic Film, Paper, Plate, Chemical, and Copy Toner Manufacturing 325992	● ACTIVE	1.3 KM
RCRaytheon Company	Ontario	Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing 334511	▲ REPORTED CLOSED	2.0 KM

Every listed plant in San Bernardino County

Also at this address

No other federal record shares this street address.

Where this record comes from

2 sources hold this plant, and 7 fields on this page come from them. Each line is one agency’s own record of it: the identifier it is filed under, whether that record shows the plant operating or only that it exists, and when the register first and last saw it there.

EPA cross-references this facility in RCRAINFO · EPA site type STATIONARY.

• EPA Facility Registry ServiceEXISTENCE
  Record 110072050028 · first seen SEP 2025 · last seen JAN 2026
• OSHA injury and illness reportsOPERATING
  Record 677795 · first seen DEC 2025 · last seen DEC 2025

ALSO RECORDED ASDOBLE ENGINEERING; DOBLE ENGINEERING COMPANY

IN SAN BERNARDINO COUNTY47 other plants share this one’s industry (Navigational, Measuring, Electromedical, and Control Instruments Manufacturing, NAICS 3345); 8 of them have a size band on record.

What each source says

Every field below, as each source filed it. The value this page shows is marked; where the sources disagree, the field says so. Status is computed from independent sources; nothing here is self-reported unless marked Claimed.

Name

EPA: DOBLE ENGINEERING · JUL 2026

Street address

EPA: 1520 S. HELLMAN AVE. · JUL 2026

City

EPA: ONTARIO · JUL 2026

State

EPA: CA · JUL 2026

County (FIPS code)

EPA: 06071 · SEP 2026

Coordinates

Census geocoder: 34.045745136931,-117.602165891975 · JUL 2026 · ON THIS PAGE

EPA: 34.045604,-117.602135 · JUL 2026 · ON THIS PAGE

Employees (band)

OSHA: 20-99 · DEC 2025