{"hq_id":"hq-p-out-000009","name":"Pressure-Treated Lumber, Decks, Fencing, and Playground Structures","category":{"primary":"outdoor","secondary":"","tags":[]},"product_tier":"OUT","overall_risk_level":"high","description":"Residential decks and playground equipment built in the 1990s and early 2000s with CCA-treated lumber continue leaching arsenic into surrounding soil. A child plays on a treated playground structure at a public park — a park built before 2003 when the CPSC banned CCA in playground equipment.","synthesis":{"derived_risk_level":"moderate_to_high","synthesis_confidence":0.856,"synthesis_method":"compound_composition","context_used":"human_child","context_source":"product_users","exposure_modifier":1.1,"vulnerability_escalated":true,"escalation_reason":"Child exposure group","compounds_resolved":3,"compounds_total":3,"synthesis_date":"2026-03-27","synthesis_version":"1.0.0"},"hazard_summary":{"critical_concern":"CCA (copper-chromium-arsenic) treated lumber continues leaching arsenic from existing structures (residential decks, playground equipment, fencing) installed before 2003 CPSC ban on CCA in playground equipment. Leaching rate 1.2 mg As/m²/year into stormwater and soil. Hand-to-mouth exposure pathway for children (soil contamination from deck leaching; direct contact with treated wood). ACQ replacement still contains copper biocide (less arsenic but increased leaching acceleration). No consumer hazard labeling on treated lumber or existing structures.","key_hazards":["CCA arsenic leaching from existing structures — 1.2 mg As/m²/year into soil and stormwater","Hand-to-mouth pathway for children on treated playgrounds — soil arsenic accumulation from decades of leaching","ACQ replacement (current) still contains copper — increased leaching acceleration (acidity increases copper/arsenic migration)","No hazard labeling on retail treated lumber or installed structures","Do-not-sand/burn instructions inadequate without hazard context"],"overall_risk":"high","primary_concerns":[],"sensitive_populations":"","exposure_routes":""},"exposure":{"routes":["dermal"],"contact_types":["dermal","inhalation"],"users":["adult","child"],"duration":"hours","frequency":"weekly","scenarios":["Incidental mouthing or hand-to-mouth transfer by children"],"notes":"Exposure to Pressure-Treated Lumber, Decks, Fencing, and Playground Structures 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":"Contains known carcinogens","meaning":"Arsenic, Hexavalent chromium [Cr(VI)] — classified by IARC or NTP as carcinogenic or probably carcinogenic to humans","action":"Minimize exposure; consider alternatives; follow use guidelines strictly"},{"indicator":"Overall risk level: high","meaning":"Multiple hazard pathways identified for this product category","action":"Limit exposure duration and frequency; use protective measures where applicable"}],"green_flags":[{"indicator":"Third-party safety tested","meaning":"Independent laboratory verification of safety claims","verification":"Check for recognized certification marks and test reports"}],"what_to_ask":[{"question":"Has this product been tested for carcinogenic compounds?","why_it_matters":"Products in this category may contain or release carcinogenic compounds; independent testing provides verification beyond manufacturer claims"}],"alternatives":[{"name":"Cedar or Redwood","notes":"Naturally rot-resistant without chemical treatments; safer for food-contact areas"},{"name":"Composite Decking","notes":"Made from recycled wood-plastic blend; no toxic chemical exposure risk"},{"name":"Aluminum or Vinyl Fencing","notes":"Non-toxic, durable alternatives requiring no chemical treatment or handling precautions"}],"notes":null},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"EPA FIFRA (Federal Insecticide, Fungicide, and Rodenticide Act)","citation":null,"requirements":"Pesticide-treated products must be registered with EPA. Product claims of antimicrobial or pest-repellent properties trigger FIFRA registration requirements.","compliance_status":null,"effective_date":null,"enforcing_agency":null,"penalties":null,"source_ref":null},{"jurisdiction":"EU","regulation":"Biocidal Products Regulation (EU) No 528/2012","citation":null,"requirements":"Treated articles must be labeled with active substance name, nanomaterial presence, and relevant instructions for use. Biocidal active substances must be on EU approved list.","compliance_status":null,"effective_date":null,"enforcing_agency":null,"penalties":null,"source_ref":null}],"certifications":[{"name":"CPSIA (if children's)","issuer":"CPSC","standard":"Consumer Product Safety Improvement Act","scope":"Lead, phthalate content limits if classified as children's product"}],"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":false,"disposal_guidance":"Varies by material; PVC items should not be burned; donate if reusable","hazardous_waste":false,"expected_lifespan":"1-3_years"},"formulation":{"form":"composite_material","key_ingredients":[{"hq_id":null,"name":"Wood (softwood: pine, fir, spruce)","role":"base_material","concentration_pct":"90-98"},{"hq_id":null,"name":"Copper-based or arsenic-based preservative","role":"additive","concentration_pct":"0.5-2"},{"hq_id":null,"name":"Water carrier","role":"solvent","concentration_pct":"1-5"}],"certifications":[]},"materials":{"common":[{"material_id":"hq-m-str-000042","material_name":"Copper and arsenic-based wood preservatives (CCA historic; ACQ current)","component":"Outdoor wood preservation; leaching hazard","prevalence":"common"}],"concerning":[{"material_id":"hq-m-str-000042","concern":"Arsenic leaching from legacy CCA-treated wood — CCA-treated decks, playgrounds, and landscaping installed before 2004 continue to leach arsenic to soil and wood surfaces; soil arsenic beneath CCA decks can exceed EPA screening levels by 100×; CPSC estimated increased childhood cancer risk from CCA playground equipment","compounds_of_concern":["hq-c-ino-000002"],"source_refs":[]},{"material_id":"hq-m-str-000042","concern":"Sawing, sanding, or burning CCA-treated wood releases arsenic and Cr(VI) in dust and ash — one tablespoon of CCA ash contains a lethal dose of arsenic; sawdust inhalation during cutting delivers arsenic and Cr(VI) directly to lungs","compounds_of_concern":["hq-c-ino-000002, hq-c-mix-000007"],"source_refs":[]},{"material_id":"hq-m-str-000042","concern":"Copper leaching from ACQ/MCA-treated wood — higher copper loading in post-CCA preservatives causes copper leaching to soil and water; aquatic toxicity to fish and invertebrates; accelerated corrosion of metal fasteners creating structural safety risk if galvanized/SS hardware not used","compounds_of_concern":["copper"],"source_refs":[]},{"material_id":"hq-m-str-000042","concern":"Potential contaminant: Arsenic leachate from CCA-treated wood surfaces and surrounding soil","compounds_of_concern":["hq-c-ino-000002"],"source_refs":[]}],"preferred":[{"material_id":null,"material_name":"Naturally durable wood species (western red cedar, redwood, white oak, black locust, ipe)","why_preferred":"","tradeoffs":"No chemical preservatives needed for above-ground applications; naturally resistant to rot and insects due to extractive chemicals (thujaplicins in cedar, tannins in redwood/oak); higher cost; limited availability; slower-growing species (sustainability concerns for tropical hardwoods like ipe); still requires maintenance"},{"material_id":null,"material_name":"Wood-plastic composite decking (Trex, TimberTech, Fiberon)","why_preferred":"","tradeoffs":"No wood preservatives; no arsenic/copper/chromium; does not rot or require sealing; made from recycled wood fiber and plastic; higher upfront cost but lower lifetime maintenance cost; does not have the structural strength of lumber (cannot be used for framing); gets hotter in sun than wood; contains plastics (see hq-m-str-000040 for recycled plastic concerns)"},{"material_id":"hq-m-str-000042","material_name":"ACQ or MCA-treated wood (current standard for ground-contact applications where preservative treatment is required)","why_preferred":"","tradeoffs":"No arsenic or chromium — the primary CCA health concerns are eliminated; copper is the active biocide; copper leaching is an environmental concern but not a human health concern at residential exposure levels; requires stainless steel or hot-dipped galvanized hardware (copper corrodes standard galvanized fasteners); more expensive than CCA was","hq_id":"hq-m-str-000042"}]},"compound_composition":[{"hq_id":"hq-c-ino-000002","compound_name":"Arsenic (inorganic)","role":"additive","typical_concentration":null},{"hq_id":"hq-c-mix-000007","compound_name":"Hexavalent chromium [Cr(VI)]","role":"additive","typical_concentration":null},{"hq_id":"hq-c-ino-000030","compound_name":"Copper","role":"additive","typical_concentration":null}],"identifiers":{"common_names":["pressure-treated wood","treated deck","treated fence","playground equipment","CCA lumber","ACQ-treated wood"],"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"}],"sources":[{"id":"src_001","type":"regulatory","title":"CPSC (2003) — CCA Ban in Playground Equipment","year":2003,"notes":"Ban applied to new equipment only; existing structures not addressed"},{"type":"regulation","title":"EPA FIFRA (Federal Insecticide, Fungicide, and Rodenticide Act)","jurisdiction":"USA","id":"src_d8613e7c"},{"type":"regulation","title":"Biocidal Products Regulation (EU) No 528/2012","jurisdiction":"EU","id":"src_6be4bd58"},{"id":"iarc_100c","type":"regulatory","title":"IARC Monographs Volume 100C: Arsenic and Arsenic Compounds","year":2012,"inherited_from_compound":"hq-c-ino-000002"},{"id":"epa_arsenic_iris","type":"regulatory","title":"US EPA IRIS Assessment: Arsenic, Inorganic","year":1998,"inherited_from_compound":"hq-c-ino-000002"},{"id":"iarc_100c_crvi","type":"regulatory","title":"IARC Monographs Volume 100C: Chromium (VI) Compounds — Arsenic, Metals, Fibres, and Dusts","year":2012,"inherited_from_compound":"hq-c-mix-000007"},{"id":"epa_crvi_iris","type":"regulatory","title":"US EPA IRIS: Chromium VI — Toxicological Review (Inhalation, Final)","year":2010,"inherited_from_compound":"hq-c-mix-000007"},{"id":"atsdr_copper_tox","type":"regulatory","title":"ATSDR: Toxicological Profile for Copper — Essential vs Toxic Threshold, Wilson's Disease, Lead and Copper Rule, Plumbing Leaching, and Dietary Sources","year":2004,"inherited_from_compound":"hq-c-ino-000030"},{"id":"epa_copper_aquatic","type":"regulatory","title":"US EPA: Aquatic Life Ambient Water Quality Criteria for Copper — Freshwater Criterion (Hardness-Adjusted), Marine Criterion (3.1 μg/L), Salmonid Olfactory Impairment, and Stormwater Runoff Context","year":2007,"inherited_from_compound":"hq-c-ino-000030"},{"type":"regulatory","title":"US Consumer Product Safety Commission (CPSC)","jurisdiction":"USA","id":"src_4e21f2c3","extraction":"description_reference"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-01T14:24:12.318Z"}}