The '''Inland Empire Regional Composting Authority''' (IERCA) is a [[sewage sludge]] treatment plant in Rancho Cucagmonga, California. It was created and is operated by the [[Inland Empire Utility Agency|Inland Empire Utilities Agency]] and the [[County Sanitation Districts of Los Angeles County]] (CSDLAC).<ref>[http://www.ierca.org/about/about.html Inland Empire Regional Composting Authority: About Us] IERCA Website Accessed April 11, 2011.</ref>
The IERCA treats [[sewage sludge]] from municipal waste treatment plants in San Bernardino County in California. It is the "nation's largest indoor composting facility," according to the IERCA website. The IERCA creates and markets [[SoilPro]] "[[biosolids compost]]," which is treated [[sewage sludge]], and markets it to retail stores, backyard gardeners and other consumers. Most [[Kellogg Garden Products]] contain the IERCA's [[sewage sludge]] product, [[SoilPro]].