Pollution in Stanislaus County, California

Stanislaus County contains 228 EPA-regulated facilities, 11 of which are currently flagged for significant noncompliance. The county also hosts 3 Superfund sites and 29 TRI chemical reporters. EPA has assessed $7.7M in lifetime penalties and TRI reporters disclosed roughly 106.4k lb of on-site releases. That facility count is well above the California state average of 108 per county.

Superfund3NPL sites
TRI Facilities29reporters
EPA Facilities228regulated
Sig. Violators11current SNC

Superfund sites

SiteCityStatus
Valley Wood Preserving IncTurlockReady for anticipated reuse
Modesto Ground Water ContaminationModestoCleanup underway
Riverbank Army Ammunition PlantRiverbankConstruction complete

Largest releasers

FacilityCityOn-site (lb)Status
Blue Diamond GrowersModesto45.6kCompliant
Darling Ingredients IncCrows Landing35.3kPenalties
Silgan Containers, RiverbankRiverbank16.0kPenalties
Conagra Foods Packaged Foods Llc.Oakdale3.4kPenalties
Sonoco Metal Packaging, LlcOakdale1.6kPenalties
Custom Marble And OnyxModesto1.6kSig. violation
Thunderbolt Wood TreatingRiverbank1.2kCompliant
Foster Farms Turkey Products Plant 1Turlock743Compliant
Enviro Tech Chemical Services IncModesto500Compliant
Frito Lay N America Inc Fka Recot IncModesto324Penalties
Crystal Creamery IncModesto129Compliant
Gallo Glass CompanyModesto21Sig. violation
Pacific Star Chemical Llc, D.b.a. Northstar ChemicalModesto16Compliant

Significant violators

FacilityCityPenaltiesLast Inspected
Gallo Glass CompanyModesto$761.7k2026-02-25
E & J Gallo Winery & BrandyModesto$165.0k2025-06-05
Reworld Stanislaus, Inc.Crows Landing$116.7k2024-09-10
California Dairies, Inc.Turlock$103.8k2026-02-11
Custom Marble And OnyxModesto$6.0k2025-03-10
Fink Road LandfillCrows Landing$3.0k2025-08-13
Ceres Unified/Westport School$0
Stanislaus Food Products CoModesto$02025-08-06
Pacific Southwest Container, LlcModesto$02026-01-06
Post Foods, LlcModesto$02016-02-29
Sunopta AsepticModesto$02026-02-12