For children and pregnant people, no level of lead is considered safe. Asbestos also has no safe threshold at any level. For these, treat any detection as a reason to consult a professional.
| Contaminant | Limit (ppm / mg/kg) | Source |
|---|---|---|
| Lead (Pb) | 80 (CA DTSC), 200 (EPA) | CA DTSC, EPA |
| Arsenic (As) | 0.67 | EPA RSL |
| Mercury (Hg) | 0.71 | DTSC (inorganic mercury) RSL |
| Copper (Cu) | 3100 | EPA RSL |
| Chromium (Cr VI) | 0.3 | EPA RSL |
| Zinc (Zn) | 23,300 | EPA RSL |
| Silver (Ag) | 390 | EPA RSL |
| Barium (Ba) | 15,000 | EPA RSL |
| Beryllium (Be) | 160 | EPA RSL |
| Cadmium (Cd) | 7.1 | EPA RSL |
| Cobalt (Co) | 23 | EPA RSL |
| Molybdenum (Mo) | 390 | EPA RSL |
| Nickel (Ni) | 140.88 | EPA RSL |
| Antimony (Sb) | 31 | EPA RSL |
| Selenium (Se) | 390 | EPA RSL |
| Thallium (Tl) | 0.78 | EPA RSL |
| Vanadium (V) | 39.3 | EPA RSL |
| Contaminant | Limit (ppm) | Source |
|---|---|---|
| Benzene | 1200 | EPA RSL |
| Benzo[a]pyrene | 0.114 ppb | EPA RSL |
| Other PAHs (e.g. fluoranthene, anthracene, chrysene, pyrene, naphthalene) | Varies (usually in ppb) | EPA RSL |
| TPH (Total) | Varies | CA Regional Boards |
| GRO (C6–C10) | ~100 | CA Water Board soil guidance |
| DRO (C10–C2M8) | ~500 | CA Water Board soil guidance |
| PFOS | 0.0063 | San Francisco Water Board Guidance |
| PFOA | 0.019 ppb | San Francisco Water Board Guidance |
| Asbestos | No safe threshold | EPA |
| TCE | 480 ppb | EPA RSL |
Department of Toxic Substances Control (DTSC) — Cal EPA State
dtsc.ca.gov/human-health-risk-hero · uses risk-based levels rather than generic screening limits
Environmental Protection Agency (EPA) — Federal Federal
epa.gov/risk/regional-screening-levels-rsls-generic-tables
A unit of measure used to describe extremely small concentrations of a contaminant in a larger substance.
Example1 ppb of fluoranthene means 1 part fluoranthene per every 1,000,000,000 (1 billion) parts soil (or 1/1,000,000,000).
Para los niños y las personas embarazadas, ningún nivel de plomo se considera seguro. El asbesto tampoco tiene un umbral seguro en ningún nivel. En estos casos, trate cualquier cantidad detectada como una razón para consultar a un profesional.
| Contaminante | Límite (ppm / mg/kg) | Fuente |
|---|---|---|
| Plomo (Pb) | 80 (CA DTSC), 200 (EPA) | CA DTSC, EPA |
| Arsénico (As) | 0.67 | EPA RSL |
| Mercurio (Hg) | 0.71 | DTSC (inorganic mercury) RSL |
| Cobre (Cu) | 3100 | EPA RSL |
| Cromo (Cr VI) | 0.3 | EPA RSL |
| Zinc (Zn) | 23,300 | EPA RSL |
| Plata (Ag) | 390 | EPA RSL |
| Bario (Ba) | 15,000 | EPA RSL |
| Berilio (Be) | 160 | EPA RSL |
| Cadmio (Cd) | 7.1 | EPA RSL |
| Cobalto (Co) | 23 | EPA RSL |
| Molibdeno (Mo) | 390 | EPA RSL |
| Níquel (Ni) | 140.88 | EPA RSL |
| Antimonio (Sb) | 31 | EPA RSL |
| Selenio (Se) | 390 | EPA RSL |
| Talio (Tl) | 0.78 | EPA RSL |
| Vanadio (V) | 39.3 | EPA RSL |
| Contaminante | Límite (ppm) | Fuente |
|---|---|---|
| Benceno | 1200 | EPA RSL |
| Benzo[a]pireno | 0.114 ppb | EPA RSL |
| Otros PAHs/HAPs (p. ej., fluoranteno, antraceno, criseno, pireno, naftaleno) | Varía (generalmente en ppb) | EPA RSL |
| TPH (total) | Varía | CA Regional Boards |
| GRO (C6–C10) | ~100 | CA Water Board soil guidance |
| DRO (C10–C2M8) | ~500 | CA Water Board soil guidance |
| PFOS | 0.0063 | San Francisco Water Board Guidance |
| PFOA | 0.019 ppb | San Francisco Water Board Guidance |
| Asbesto | No hay umbral seguro | EPA |
| TCE | 480 ppb | EPA RSL |
Department of Toxic Substances Control (DTSC) — Cal EPA Estatal
dtsc.ca.gov/human-health-risk-hero · usa niveles basados en riesgo en lugar de niveles de detección genéricos
Environmental Protection Agency (EPA) — Federal Federal
epa.gov/risk/regional-screening-levels-rsls-generic-tables
Una unidad de medida que se usa para describir concentraciones extremadamente pequeñas de un contaminante en una sustancia más grande. En esta unidad, "billón" corresponde al billion inglés: 1,000,000,000 (mil millones).
Ejemplo1 ppb de fluoranteno significa 1 parte de fluoranteno por cada 1,000,000,000 (mil millones) de partes de suelo (o 1/1,000,000,000).