Compost testing provides a scientific way to promote the best composting practices and enhance product quality.

Note: Sewage sludge treatment must meet class A or class B pathogen reduction for samples to be analyzed by the lab. Also, industrial sludge samples will only be analyzed if they have passed the EPA toxicity characteristic leaching procedure (TCLP) test.

Analyses Available (Solids only) In State* Out-of-State*
Standard1 $25 $50
Special2 $40 $80
Carbon:Nitrogen $10 $20
Bulk Density $10 $20
Nitrate Nitrogen $10 $20
Fax Report $1 $1
Mailed Paper Report $1 $1

*Cost stated is per sample.
1. Includes percent moisture, total nitrogen, total carbon, carbon:nitrogen ratio, pH, organic matter, and soluble salts.
2. Includes the standard analysis listed above plus ammonium nitrogen and total digestible phosphorus, potassium, calcium, magnesium, sulfur, zinc, copper, manganese, iron, aluminum, and sodium.


Submission Forms
Compost/Sludge Form
How to Complete Forms
How to Collect a Sample

Lab Guidelines
Interpretation of Compost Report

Lab Methods

Contact Agricultural Service Laboratory for volume discounts.