Facility	City	Industry	Status	Distance
Robertson's Ready Mix INC	Pomona	Ready-Mix Concrete Manufacturing 327320	UNVERIFIED	0.0 KM
R F Herrera Concrete Construction	San Dimas	Concrete Block and Brick Manufacturing 327331	UNVERIFIED	5.8 KM
Shamrock Processed Base CO	Diamond Bar	Ready-Mix Concrete Manufacturing 327320	UNVERIFIED	7.3 KM
Cemex Construction Materials LP	Walnut	Ready-Mix Concrete Manufacturing 327320	UNVERIFIED	7.5 KM
Calportland CO	Glendora	Cement Manufacturing 327310	ACTIVE	8.5 KM

Every listed plant in Los Angeles County

Also at this address

1 other record shares this street address. Separate filings can describe distinct businesses on one site, or the same plant recorded by different agencies, so every record is kept rather than merged away.

Robertson's Ready Mix INC

Pomona, CA

UNVERIFIED327320

WHERE THIS RECORD COMES FROM — 3 FEDERAL SOURCES, 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 CA-ENVIROVIEW, TRIS · EPA site type STATIONARY.

Source	Evidence	First seen	Last seen
OSHA ITA	OPERATING	DEC 2025	DEC 2025
EPA TRI	OPERATING	DEC 2023	DEC 2023
EPA FRS	EXISTENCE	JUN 2016	JUN 2016

FIELD BY FIELD — WHICH SOURCE SUPPLIED WHAT

FIELD	SOURCE	SIGNAL
ADDRESS LINE1	EPA FRS	JUL 2026
CITY	EPA FRS	JUL 2026
EMPLOYEE BAND	OSHA ITA	DEC 2025
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.

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