Wyoming Administrative Code
Agency 020 - Environmental Quality, Dept. of
Sub-Agency 0011 - Water Quality
Chapter 15 - USE OF SURFACE DISPOSAL OF BIOSOLIDS, APP. A-C
Part B - LAND APPLICATION
Section 14 - Pollutant limits

Universal Citation: WY Code of Rules 14

Current through September 21, 2024

(a) Biosolids.

(i) Bulk biosolids or biosolids 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 biosolids exceeds the ceiling concentration for the pollutant in Table 1 of Section 14.

(ii) If bulk biosolids are applied to agricultural land, forest, a public contact site, or a reclamation site, either:
(A) The cumulative loading rate for each pollutant shall not exceed the cumulative pollutant loading rate for the pollutant in Table 2 of Section 14; or

(B) The concentration of each pollutant in the biosolids shall not exceed the concentration for the pollutant in Table 3 of Section 14.

(iii) If bulk biosolids are applied to a lawn or a home garden, the concentration of each pollutant in the biosolids shall not exceed the concentration for the pollutant in Table 3 of Section 14.

(iv) If biosolids are sold or given away in a bag or other container for application to the land, either:
(A) The concentration of each pollutant in the biosolids shall not exceed the concentration for the pollutant in Table 3 of Section 14; or

(B) The product of the concentration of each pollutant in the biosolids and the annual whole sludge application rate for the biosolids shall not cause the annual pollutant loading rate for the pollutant in Table 4 of Section 14 to be exceeded. The procedure used to determine the annual whole sludge application rate is presented in Appendix A of this chapter.

(b) Pollutant concentrations and loading rates - biosolids.

(i) Ceiling concentrations.

Table 1 of Section 14

Copper

Lead

Mercury

Molybdenum

Nickel

Selenium

Zinc Ceiling Concentration

(milligrams per kilogram)*

75

85

4300

840

57

75

420

100

7500

* Dry weight basis

(ii) Cumulative pollutant loading rates.

Table 2 of Section 14

Pollutant

Arsenic

Cadmium

Copper

Lead

Mercury

Molybdenum

Nickel

Zinc

Cumulative Pollutant Loading Rate

(kilograms per hectare)

41

39

1500

300

17

-*

420

2800

* Currently under review by EPA.

(iii) Pollutant concentrations. Table 3 of Section 14

Pollutant

Arsenic

Cadmium

Copper

Lead

Mercury

Molybdenum

Nickel

Selenium

Zinc Pollutant concentrations

(milligrams per kilogram)*

41

39

1500

300

17

-**

420

100

2800

* Dry weight basis.

** Currently under review by EPA.

(iv) Annual pollutant loading rates.

Table 4 of Section 14

Pollutant

Arsenic

Cadmium

Copper

Lead

Mercury

Molybdenum

Nickel

Zinc Annual Pollutant Loading Rate

(kilograms per hectare per 365 day period)

2.0

1.9

75

15

0.85

-*

21

140

* Currently under review by EPA.

(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).

AAR = N/0.0026 Eq.(1)

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.

Disclaimer: These regulations may not be the most recent version. Wyoming may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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