STA Certified Compost
Hansen’s Tree Service is STA Certified by the US Composting Council’s Seal of Testing Assurance Program (STA). That means that our compost is tested for quality and complies with all applicable local, state, and federal regulations, giving you peace of mind:
- pH
- Soluble salts
- Nutrient content (total N, P2O5, K2O, Ca, Mg)
- Moisture content
- Organic matter content
- Bioassay (maturity)
- Stability (respirometry)
- Particle size (report only)
- Pathogen (Fecal Coliform or Salmonella)
- Trace metals (Part 503 regulated metals)