Open Nutrient Project EPA Limits

EPA Soil Limits

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Source: https://www.epa.gov/chemical-research/ecological-soil-screening-level

Heavy Metal Concentration (In Soil) Limits Per The Clean Water Act Section 503.13
Table 3 of § 503.13 – Pollutant Concentrations
PollutantMonthly average concentration (milligrams per kilogram) 1
Arsenic41
Cadmium39
Copper1500
Lead300
Mercury17
Nickel420
Selenium100
Zinc2800