{"hq_id":"hq-p-hom-000051","name":"Bagged Potting Soil, Peat Moss, and Garden Compost Products","category":{"primary":"household","secondary":"","tags":[]},"product_tier":"HOM","overall_risk_level":"high","description":"In New Zealand, Legionella longbeachae in potting soil killed a woman who opened a bag in her garden. An investigation revealed the same contamination across commercial potting soil brands (13% positive).","synthesis":{"derived_risk_level":"severe","synthesis_confidence":0.737,"synthesis_method":"compound_composition","context_used":"human_child","context_source":"product_users","exposure_modifier":0.935,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":1,"compounds_total":1,"synthesis_date":"2026-05-09","synthesis_version":"1.2.0","methodology_note":"exposure_modifier and adjusted_magnitude are computed from ALETHEIA-calibrated heuristics (route × duration × frequency multipliers, clamped to [0.5, 1.4]). Multipliers are directionally informed by EPA Exposure Factors Handbook (2011) and CalEPA OEHHA but are not regulatory consensus. See /api/methodology for full disclosure."},"hazard_summary":{"critical_concern":"Legionella longbeachae documented in 13–20% of commercial potting mixes (NZ/AU data); no systematic testing in US. Bag-opening aerosolization causes infections and documented fatalities in immunocompromised individuals. No warning label on any US potting soil product. PFAS in biosolids-based compost contaminates vegetables grown in amended gardens (FDA 2022). Elderly gardeners (85M+ US homeowners) and immunocompromised individuals at severe risk.","key_hazards":["Legionella longbeachae — documented fatalities from bag-opening aerosolization; 13–20% of commercial potting mixes positive; no labeling","Aspergillus fumigatus — invasive aspergillosis in immunocompromised; deaths from compost-related exposure documented","Endotoxin inhalation — acute lung function loss at 90–1,000 EU/m³ during potting activities","PFAS bioaccumulation — vegetables grown in PFAS-amended biosolids compost; food chain contamination; no disclosure on bags","No federal labeling requirement for pathogenic contamination"],"overall_risk":"high","primary_concerns":[],"sensitive_populations":"","exposure_routes":""},"exposure":{"routes":["dermal"],"contact_types":["dermal","inhalation"],"users":["adult","child"],"duration":"minutes","frequency":"weekly","scenarios":["Incidental mouthing or hand-to-mouth transfer by children"],"notes":"Exposure to Bagged Potting Soil, Peat Moss, and Garden Compost Products occurs via dermal. Children and infants face higher exposure per body weight due to developing detoxification systems, higher surface-area-to-weight ratio, and behavioral factors (mouthing, crawling)."},"consumer_guidance":{"red_flags":[{"indicator":"Identified safety concern","meaning":"Legionella longbeachae documented in 13–20% of commercial potting mixes (NZ/AU data); no systematic testing in US.","action":"Review safety data; follow use guidelines; consider alternatives"}],"green_flags":[{"indicator":"EPA Safer Choice certified","meaning":"Meets EPA criteria for safer chemical ingredients","verification":"Look for EPA Safer Choice label on packaging"}],"what_to_ask":[{"question":"Is this product safe for use around children and pets?","why_it_matters":"Many household chemicals are formulated for adult use; children and pets have higher exposure per body weight and developing organ systems"}],"alternatives":[{"name":"Coco coir-based potting mix","notes":"Lower mold and dust risk than peat moss; more sustainable source"},{"name":"Composted pine bark mulch","notes":"Reduced pathogen load compared to uncomposted materials; better for outdoor use"},{"name":"Certified sterile seed-starting mix","notes":"Pasteurized product minimizes mold and pathogenic organism risk"}],"notes":null},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"Consumer Product Safety Act (CPSA) + FHSA","citation":null,"requirements":"Household products must not present unreasonable risk of injury. Federal Hazardous Substances Act requires labeling of hazardous household products (corrosive, flammable, toxic, irritant).","compliance_status":null,"effective_date":null,"enforcing_agency":null,"penalties":null,"source_ref":null},{"jurisdiction":"USA","regulation":"EPA Safer Choice / Design for the Environment","citation":null,"requirements":"Voluntary program. Products meeting Safer Choice criteria can display the label. Requires disclosure of all ingredients and safer chemical alternatives.","compliance_status":null,"effective_date":null,"enforcing_agency":null,"penalties":null,"source_ref":null},{"jurisdiction":"EU","regulation":"CLP Regulation (EC) No 1272/2008","citation":null,"requirements":"Classification, labelling, and packaging of hazardous chemical products. GHS-aligned hazard communication. Signal words, pictograms, and precautionary statements required.","compliance_status":null,"effective_date":null,"enforcing_agency":null,"penalties":null,"source_ref":null}],"certifications":[{"name":"CPSC General Safety","issuer":"CPSC","standard":"Consumer Product Safety Act","scope":"General consumer product safety requirements"}],"labeling":{"required_disclosures":[],"prop65_warning":{"required":null,"chemicals":[],"endpoint":null,"notes":null},"ghs_labeling":{"required":null,"signal_word":null,"pictograms":[],"hazard_statements":[],"notes":null},"hidden_ingredients":{"trade_secret_protected":null,"categories_hidden":[],"estimated_count":null,"known_concerns":null,"notes":null},"notes":null},"recalls":[],"regulatory_gap":null,"notes":null},"lifecycle":{"recyclable":null,"disposal_guidance":"Varies by material; check local recycling guidelines","hazardous_waste":false,"expected_lifespan":"1-3_years"},"formulation":{"form":"composite_material","key_ingredients":[{"hq_id":null,"name":"Peat moss or coco coir (organic base)","role":"base_material","concentration_pct":"50-70"},{"hq_id":null,"name":"Perlite (drainage additive)","role":"filler","concentration_pct":"10-20"},{"hq_id":null,"name":"Fertilizer (slow-release NPK)","role":"active_ingredient","concentration_pct":"2-5"},{"hq_id":null,"name":"Wetting agent (surfactant to improve water uptake)","role":"surfactant","concentration_pct":"<1"}],"certifications":[]},"materials":{"common":[{"material_id":"hq-m-adv-000010","material_name":"Potting soil, peat moss, and horticultural growing media","component":"Commercial potting mix products sold for home gardening","prevalence":"common"}],"concerning":[{"material_id":"hq-m-adv-000010","concern":"Legionella longbeachae — documented fatalities from potting mix bag-opening aerosolization; 13–20% of commercial potting mixes contaminated (NZ/AU data); US prevalence unknown; no labeling or hazard warning on any US potting soil product","compounds_of_concern":[],"source_refs":[]},{"material_id":"hq-m-adv-000010","concern":"Aspergillus fumigatus — opportunistic pathogen in potting mix; invasive aspergillosis documented from compost exposure; LD₅₀ in vulnerable populations","compounds_of_concern":[],"source_refs":[]},{"material_id":"hq-m-adv-000010","concern":"Saccharopolyspora rectivirgula — thermophilic actinomycete; cause of 'farmer's lung' (hypersensitivity pneumonitis); sensitization irreversible","compounds_of_concern":[],"source_refs":[]},{"material_id":"hq-m-adv-000010","concern":"Endotoxin exposure — LPS from Gram-negative bacteria in compost; acute lung function loss documented at 90–1,000 EU/m³","compounds_of_concern":[],"source_refs":[]},{"material_id":"hq-m-adv-000010","concern":"PFAS contamination (PFOA/PFOS) in biosolids-based compost — 1,000–10,000 ppt in some products; plants uptake PFAS; humans consume contaminated vegetables; no disclosure on product labels","compounds_of_concern":[],"source_refs":[]},{"material_id":"hq-m-adv-000010","concern":"Regulatory gap — no federal labeling requirement for Legionella, Aspergillus, or other biological pathogens; no PFAS standard for biosolids-based compost; EPA Part 503 biosolids rule does not include PFAS standards","compounds_of_concern":[],"source_refs":[]},{"material_id":"hq-m-adv-000010","concern":"Potential contaminant: Aspergillus fumigatus spores","compounds_of_concern":[],"source_refs":[]}],"preferred":[{"material_id":"hq-m-adv-000010","material_name":"Peat-free potting mixes (coir, pine bark)","why_preferred":"","tradeoffs":"Reduced Legionella/Aspergillus risk if source materials tested; environmental concerns (coir sourcing); similar or higher cost; variable quality","hq_id":"hq-m-adv-000010"},{"material_id":"hq-m-adv-000010","material_name":"Pathogen-tested and PFAS-tested potting mixes","why_preferred":"","tradeoffs":"Higher cost; limited commercial availability; requires industry/regulatory adoption of testing standards","hq_id":"hq-m-adv-000010"},{"material_id":null,"material_name":"Home composting (reduce reliance on commercial products)","why_preferred":"","tradeoffs":"Requires time/labor; quality variable; risk of Aspergillus in home compost if not properly managed"}]},"compound_composition":[{"hq_id":"hq-c-mix-000001","compound_name":"PFAS (Per- and Polyfluoroalkyl Substances)","role":"base","typical_concentration":null}],"identifiers":{"common_names":["potting soil","peat moss","garden compost","growing media","compost bags"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"Generic Mass-Market Brand A","manufacturer":"Consumer Products Corporation","market_position":"mass_market","notable":"Widely available mass-market option"},{"brand":"Generic Mass-Market Brand B","manufacturer":"Consumer Goods Ltd","market_position":"mass_market","notable":"Popular budget alternative"},{"brand":"Premium Brand A","manufacturer":"Premium Consumer Inc","market_position":"premium","notable":"Upscale premium positioning"},{"brand":"Professional Brand","manufacturer":"Professional Products Co","market_position":"professional","notable":"Professional/salon-grade option"},{"brand":"Specialty Eco-Brand","manufacturer":"Natural Products Ltd","market_position":"premium","notable":"Sustainable/natural product line"}],"brand_examples_disclaimer":"Representative branded products of this category. Concerning ingredients listed in materials.concerning[] apply to the category, not necessarily to every named brand. Specific formulations vary by SKU and may have changed since this record was written; consult the brand's current ingredient label before drawing brand-level conclusions.","sources":[{"id":"src_001","type":"government","title":"New Zealand Legionella Investigation — Potting Mix Contamination","year":2017},{"type":"regulation","title":"Consumer Product Safety Act (CPSA) + FHSA","jurisdiction":"USA","id":"src_5f50aaf4"},{"type":"regulation","title":"EPA Safer Choice / Design for the Environment","jurisdiction":"USA","id":"src_44bbb086"},{"type":"regulation","title":"CLP Regulation (EC) No 1272/2008","jurisdiction":"EU","id":"src_74945c54"},{"citation":"EPA. PFAS National Primary Drinking Water Regulation. Federal Register. 2024;89:32531","url":"https://www.federalregister.gov/documents/2024/04/26/2024-07773/pfas-national-primary-drinking-water-regulation","relevance":"US regulatory standards","id":"src_002","type":"epa","inherited_from_compound":"hq-c-mix-000001"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-14T01:28:29.533Z"}}