Arsenic (inorganic) in the yard and garden
High risk for your yardIARC Group 1; lung, bladder, skin cancers; >300M people drink water above WHO 10 μg/L limit.
What is arsenic (inorganic)?
The IUPAC name is arsenic.
Also known as: arsenic, Arsen, Arsenic-75, Gray arsenic.
- IUPAC name
- arsenic
- CAS number
- 7440-38-2
- Molecular formula
- As
- Molecular weight
- 74.92159 g/mol
- SMILES
- [As]
- PubChem CID
- 5359596
Risk for people, pets,
High riskIARC Group 1; lung, bladder, skin cancers; >300M people drink water above WHO 10 μg/L limit.
Regulatory consensus
12 regulatory and scientific bodies have classified Arsenic (inorganic). The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| IARC | 2012 | Group 1 (carcinogenic to humans) | Lung, bladder, skin cancer; Monograph 100C |
| US EPA | 1998 | Known to be a human carcinogen | Lung and bladder cancer; arsenic in drinking water |
| EPA CTX / NIOSH | — | potential occupational carcinogen | |
| EPA CTX / IRIS | — | A (Human carcinogen) | |
| EPA CTX / NTP RoC | — | Known Human Carcinogen | |
| EPA CTX / IARC | — | Group 1 - Carcinogenic to humans | |
| EPA CTX / Health Canada | — | Group I: CEPA (carcinogenic to humans) | |
| EPA CTX / Genetox | — | Genotoxicity: positive (single report) (Ames: None, 1 positive / 0 negative reports) | |
| EPA CTX / Genetox | — | Genotoxicity: positive (single report) (Ames: None, 1 positive / 0 negative reports) | |
| EPA CTX / Skin-Eye | — | Eye Irritation: Category 2 (score: high) | |
| EPA CTX / Skin-Eye | — | skin sensitisation: in vivo (non-LLNA): Not likely to be sensitizing (score: low) | |
| EPA CTX / Skin-Eye | — | eye irritation: in vivo: Corrosive or Irritation Persists for > 21 days (score: very high) |
Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.
Where your yard encounter arsenic (inorganic)
-
Drinking Water
— Groundwater in arsenic-rich geological regions, Tap water in areas with natural arsenic deposits, Well water in South Asia, Bangladesh, and parts of Latin America
WHO guideline limit is 10 μg/L; over 300 million people globally consume water exceeding this limit
-
Food
— Rice and rice-based products, Seafood and shellfish, Vegetables grown in contaminated soil or irrigated with arsenic-containing water
Bioaccumulation occurs in aquatic food chains; rice is particularly efficient at accumulating inorganic arsenic
-
Occupational Settings
— Metal smelting and processing facilities, Wood treatment and preservation operations, Mining and ore processing sites, Glass and semiconductor manufacturing
Workers exposed to inorganic arsenic dust and fumes; significant lung and skin cancer risk
-
Environmental/Soil
— Contaminated soil near former industrial sites, Agricultural areas treated with arsenic-containing pesticides or herbicides, Areas with natural geological arsenic deposits
Environmental persistence leads to long-term exposure pathways through soil-to-plant-to-human routes
Safer alternatives
Lower-risk approaches that achieve a similar outcome to Arsenic (inorganic):
-
Process controls to minimize degradant formation
Trade-offs: Additional manufacturing costRelative cost: 1.2-2×
Frequently asked questions
Is arsenic (inorganic) safe for your yard?
IARC Group 1; lung, bladder, skin cancers; >300M people drink water above WHO 10 μg/L limit.
What products contain arsenic (inorganic)?
Arsenic (inorganic) appears in: Groundwater in arsenic-rich geological regions (Drinking water); Tap water in areas with natural arsenic deposits (Drinking water); Rice and rice-based products (Food); Seafood and shellfish (Food); Metal smelting and processing facilities (Occupational settings).
Why do regulators disagree about arsenic (inorganic)?
Arsenic (inorganic) has been classified by 12 agencies including IARC, US EPA, EPA CTX / NIOSH, EPA CTX / IRIS, EPA CTX / NTP RoC, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.
See Arsenic (inorganic) in the outdoor app
Look up products containing arsenic (inorganic), compare to alternatives, and explore the full data record.
Open in outdoor View raw API dataSources (2)
- IARC Monographs Volume 100C: Arsenic and Arsenic Compounds (2012) — regulatory
- US EPA IRIS Assessment: Arsenic, Inorganic (1998) — regulatory
Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →