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Electronic Code of Federal Regulations

e-CFR data is current as of December 12, 2019

Title 40Chapter ISubchapter OPart 503Subpart B → §503.13


Title 40: Protection of Environment
PART 503—STANDARDS FOR THE USE OR DISPOSAL OF SEWAGE SLUDGE
Subpart B—Land Application


§503.13   Pollutant limits.

(a) Sewage sludge. (1) Bulk sewage sludge or sewage sludge sold or given away in a bag or other container shall not be applied to the land if the concentration of any pollutant in the sewage sludge exceeds the ceiling concentration for the pollutant in Table 1 of §503.13.

(2) If bulk sewage sludge is applied to agricultural land, forest, a public contact site, or a reclamation site, either:

(i) The cumulative loading rate for each pollutant shall not exceed the cumulative pollutant loading rate for the pollutant in Table 2 of §503.13; or

(ii) The concentration of each pollutant in the sewage sludge shall not exceed the concentration for the pollutant in Table 3 of §503.13.

(3) If bulk sewage sludge is applied to a lawn or a home garden, the concentration of each pollutant in the sewage sludge shall not exceed the concentration for the pollutant in Table 3 of §503.13.

(4) If sewage sludge is sold or given away in a bag or other container for application to the land, either:

(i) The concentration of each pollutant in the sewage sludge shall not exceed the concentration for the pollutant in Table 3 of §503.13; or

(ii) The product of the concentration of each pollutant in the sewage sludge and the annual whole sludge application rate for the sewage sludge shall not cause the annual pollutant loading rate for the pollutant in Table 4 of §503.13 to be exceeded. The procedure used to determine the annual whole sludge application rate is presented in appendix A of this part.

(b) Pollutant concentrations and loading rates—sewage sludge—(1) Ceiling concentrations.

Table 1 of §503.13—Ceiling Concentrations

PollutantCeiling concentration (milligrams per kilogram)1
Arsenic75
Cadmium85
Copper4300
Lead840
Mercury57
Molybdenum75
Nickel420
Selenium100
Zinc7500

1Dry weight basis.

(2) Cumulative pollutant loading rates.

Table 2 of §503.13—Cumulative Pollutant Loading Rates

PollutantCumulative pollutant loading rate (kilograms per hectare)
Arsenic41
Cadmium39
Copper1500
Lead300
Mercury17
Nickel420
Selenium100
Zinc2800

(3) Pollutant concentrations.

Table 3 of §503.13—Pollutant Concentrations

PollutantMonthly average concentration (milligrams per kilogram)1
Arsenic41
Cadmium39
Copper1500
Lead300
Mercury17
Nickel420
Selenium100
Zinc2800

1Dry weight basis.

(4) Annual pollutant loading rates.

Table 4 of §503.13—Annual Pollutant Loading Rates

PollutantAnnual pollutant loading rate (kilograms per hectare per 365 day period)
Arsenic2.0
Cadmium1.9
Copper75
Lead15
Mercury0.85
Nickel21
Selenium5.0
Zinc140

(c) Domestic septage. The annual application rate for domestic septage applied to agricultural land, forest, or a reclamation site shall not exceed the annual application rate calculated using equation (1).

eCFR graphic ec15no91.192.gif

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Where:

AAR = Annual application rate in gallons per acre per 365 day period.

N = Amount of nitrogen in pounds per acre per 365 day period needed by the crop or vegetation grown on the land.

[58 FR 9387, Feb. 19, 1993, as amended at 58 FR 9099, Feb. 25, 1994; 60 FR 54769, Oct. 25, 1995]

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