Be Certain About Your Compost.

If you’re considering making, specifying, or purchasing compost, you need to know its properties. We are one of only a few laboratories in the US that have been STA (Seal of Testing Assurance) certified. Not all composts are the same, and knowing their qualities is key to understanding how to best utilize these resources.

*Samples that require bacterial testing must be received Monday through Thursday. Samples obtained on Friday or before a scheduled holiday closure will be assessed an additional fee.

Compost Test Packages

ID Description
C1 Solids, Nitrogen, Phosphorus, Potassium $45.00
C2 C1 plus Sulfur, Calcium, Magnesium, Sodium, Iron, Aluminum, Manganese, Copper, Zinc $65.00
C3 C1 plus Organic Matter and Carbon, and C:N Ratio $55.00
C4 C1 plus Ammonium-Nitrogen $55.00
C5 C2 plus Ammonium-Nitrogen $75.00
C6 C2 plus Organic Matter and Carbon, C:N Ratio, pH, Soluble Salts $90.00
C10 Required for United States Composting Council (USCC) Seal of Testing Assurance (STA) Participants includes Solids, Total Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, pH, Soluble Salts, Organic Matter, Carbon, C:N Ratio, Fecal Coliform (MPN Class A), Aggregate Size Distribution, Germination, Respiration, Foreign Material (Inerts), and 503 Heavy Metals $375.00
C10w/o Solids, Total Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, pH, Soluble Salts, Organic Matter, Carbon, C:N Ratio, Aggregate Size Distribution, Germination, Foreign Material (Inerts), and Respiration. $225.00
C:N Package Solids, C:N Ratio, Total Nitrogen, Organic Matter and Carbon The above packages include Total Nitrogen by Dumas Method. Total Kjeldahl Nitrogen analysis may be substituted. Please contact the laboratory. $38.00
503 Metals Pkg Arsenic, Cadmium, Chromium, Copper, Lead, Mercury, Molybdenum, Nickel, Selenium and Zinc $170.00

Compost Tea Test Packages

ID Description
CT8 Analysis of compost tea solution (provided by client): pH , Nitrate-Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, Sodium, Conductivity $30.00
CT8A Same as CT8 plus Zinc, Manganese, Iron, Copper, Boron, Sulfur $40.00
Compost Tea Preparation A&L Great Lakes technicians will follow your instructions on preparation of your compost tea. Variations include tea extraction ratios, extracting solutions, extraction time, aeration, etc. Inquire

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