CalMat Co. dba Shamrock Materials ready-mix concrete plant in Petaluma, CA
Petaluma RMC Plant 5138 · serving Petaluma, CA 94952-3318 (Marin County)
NRMCA-certified
CalMat Co. dba Shamrock Materials (Petaluma RMC Plant 5138) is an NRMCA-certified ready-mix concrete plant serving Petaluma, CA and nearby ZIP areas. Request a ready-mix concrete quote for your pour (concrete strength, approximate size, pour date, and notes like slump or site access) below.
Certification
NRMCA cert #33436
Listed as certified when last checked 2026-07-03 · expires 2027-02-17
Contact
(800) 675-1511
Location is ZIP-area approximate; confirm exact address with the plant.
Available strengths (PSI), slump, and admixtures aren't verified here. Tell us your spec and we'll confirm with the plant. Estimates only.
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Source: NRMCA Currently Certified Plants directory. Ready Mix Concrete is an independent directory of NRMCA-certified ready-mix concrete plants and is not affiliated with CalMat Co. dba Shamrock Materials.