Hansen’s Tree Service is committed to bringing you only the best compost and mulch products. That is why we work so hard to ensure that our organic products meet certification standards from trusted organizations like the U.S. Composting Council and OMRI™. These certifications mean that our products are produced and regularly tested for quality and safety.

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)

You can view our certification here.

OMRI™ Listed® For Organic Use

The OMRI™ listing indicates that our compost and the materials that go into it are compliant for organic use, meeting the following criteria:

  • Rigorous certification procedures to ensure our product complies with organic standards
  • National Organic Program (NOP) manufacturing requirements
  • Salmonella testing compliance
  • Daily and weekly compost temperature recordings

View our certification here.

OMRI products available