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List of Certified Compost Facilities

The information of the facilities on this list was extracted from the STA Certified Compost Participants from the US Composting Council.

The information provided in this listing are for informational purposes only and do not constitute endorsement or recommendation by University of California Cooperative Extension, nor is criticism implied of similar companies that are not included.

If you would like any vendor information added or edited, please email mridoutt@ucanr.edu

Company Product Address Contact Phone
Synagro - South Kern Compost Manufacturing Facility  AllGro® Compost, Tested once per month 2653 Santiago Rd
Taft, CA 93268

Robert Rankin


(661) 765-2200
Recology Organics - Blossom Valley Organics – South  Recology Premium Compost, Tested once per month 6061 N Wheeler Ridge Rd
Lamont, CA 93241

Kim Carrier


(707) 249-1338
Kochergen Farms Composting, Inc. Kochergen Farms Compost, Tested once per month   33915 Avenal Cutoff Rd
Kettleman City, CA 93239

Katrina Kochergen



(559) 498-0900
Waste Management – WM South Valley Compost Facility  WM Yield, Tested once per month 24487 Rd 140
Tulare, CA 93274

Jason Sears


(559) 753-0040
(760) 241-1284
WC Wood Industries  Manure Compost, Tested once every two months     7715 Ave 296
Visalia, CA 93291

Manuel Avalos


(559) 471-8775
Cal Poly State University - Cal Poly Compost Cal Poly Compost, Tested once every three months  1 Grand Ave.
San Luis Obispo, CA 93407

Kevin Piper


(805) 756-2563
Engel & Gray Inc. – Engel & Gray, Inc Regional Compost Facility  Harvest Blend Compost, Tested once every two months 745 West Betteravia Road
Santa Maria, CA 93455

Bob Engel



(805) 925-2771
Foothill Soils, Inc Compost, Tested once every two months  22925 Coltrane Ave
Newhall, CA 91321

Steven Rohletter


(661) 254-1045


Last updated: August 3rd 2022