STA Certified Compost For Professionals2020-05-15T12:03:51-05:00

IDOT (Illinois Department of Transportation) – Certified Producer

Approved supplier for Illinois Department of Transportation (IDOT) for road and bridge construction use (IDOT Producer / Supplier Number is 7122-01)

Why Professional Need STA Certified Compost

Sta Certified Compost For ProfessionalsDOTs across the country have shown their confidence in the efficacy of the Seal of Testing Assurance program’s STA Certified Compost products by requiring its use on projects under their jurisdiction.

The US Composting Council’s Seal of Testing Assurance Program “STA” is a compost testing, labeling and information disclosure program designed to give you the information you need to get the maximum benefit from the use of compost.

The program was created in 2000 and its method of testing and certifying compost is considered a gold standard by compost research scientists. It is the only compost testing program currently available that gives this level of labeling and information disclosure.

Landscape architect, engineer, and Department of Transportation’s shared specifications will help you get started in specifying STA Certified Compost for your project.

Compost filter berms and blankets (layers of compost covering the soil) for sediment and erosion control on steep slopes.


The IDOT Standard Specifications for Road and Bridge Construction

1081.05 Topsoil and Compost. Topsoil and compost shall be according to the following.

(a) Topsoil. Topsoil shall be loamy soil from the A horizon of soil profiles of local soils. Loamy soil and the A horizon soil profile are defined in the Geotechnical Manual. The loamy soil shall have an organic content between one and ten percent according to AASHTO T 194. It shall be relatively free from large roots, sticks, weeds, brush, or stones larger than 1 in. (25 mm) in diameter, or other litter and waste products. At least 90 percent shall pass the No. 10 (2.00 mm) sieve according to ITP 27, and the pH shall be between 5.0 and 8.0 according to ASTM D 4972.

Topsoil shall be capable of supporting and germinating vegetation.

(b) Compost. Compost shall be thoroughly decomposed organic waste produced at an IEPA registered composting facility. The compost shall have no glass or metal shards present. Any plastic or other man made material shall be no larger than 1/4 in. (6 mm) and sieved out to be less than one percent of the total dry weight. A copy of the compost test results complying with IEPA standards for General Use Compost and certification of IEPA registration shall be provided to the Engineer with each shipment of compost.

Compost shall be capable of supporting and germinating vegetation.