Statutes, codes, and regulations
Wyoming Administrative Code
Agency 020 - Environmental Quality, Dept. ofSubagency 0011 - Water QualityChapter 11 - DESIGN AND CONSTRUCTION STANDARDS FOR SEWERAGE SYSTEMS, TREATMENT WORKS, DISPOSAL SYSTEMS OR OTHER FACILITIES CAPABLE OF CAUSING OR CONTRIBUTING TO POLLUTION AND MOBILE HOME PARK AND CAMPGROUND SEWERAGE AND PUBLIC WATER SUPPLY DISTRIBUTION SYSTEMS
Part E - STANDARDS FOR THE APPLICATION OF BIOSOLIDS AND THE REUSE OF TREATED NON-DOMESTIC WASTEWATER
Section 11-55 - Irrigation Water Quality

020-11 Wyo. Code R. § 11-55

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Current through April 27, 2019
Section 11-55 - Irrigation Water Quality

(a) The surface infiltration rate and hydraulic conductivity of the soil profile shall be approximated by the appropriate tests and used in determining an average annual application rate.

(b) Indigenous or crop plant species shall be capable of survival and maintenance under the conditions of increased soil moisture, salinity, and alkalinity, the classes of which will be determined by use of Figure 1, Tables 1-3 and a soil textural analysis. Waste and wastewater analyses required for this evaluation include electrical conductivity (EC in umhos/cm @ 25°C), sodium (Na+), calcium (Ca2+), magnesium (Mg2+), bicarbonate (HCO3), chloride (Cl-), sulfate (SO42-), Boron (B) and Selenium (Se), and calculation of the Sodium Adsorption Ratio (SAR) by use of the formula:

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(c) Numerical water quality criteria for special situations.

  • (i) For continuous and unrestricted irrigation of direct human consumption food crops or of parks, playgrounds, highway rest areas and rights-of-way (R.O.W.s), or domestic, commercial and industrial grounds with treated municipal wastewater effluent, the following quality criteria shall not be exceeded:

    pH 4.5 - 9.0 s.u.
    BOD 10.0 mg/L Daytime
    BOD 30 mg/L Dusk-Dawn
    TSS 5.0 mg/L Daytime
    TSS 100 mg/L Dusk-Dawn
    Fecal Coliforms 200/100 mL
    (positive disinfection)
    TDS 480.0 mg/L
    Electrical Condutivity, (EC) 750 micromhos/cm@25°C
    Sodium Adsorption Ratio (SAR) 10
    Chlorides (Cl-) 213 mg/L
    Sulfates (SO4 2-) 192 mg/L
    Bicarbonates (HO3 -) Not greater than 50 percent of the total anion concentration in meq/L
    Aluminum (Al) 5.0 mg/L
    Arsenic (As) 1.0 mg/L
    Beryllium (Be) 0.1 mg/L
    Boron (B) 0.6 mg/L
    Cadmium (Cd) 0.01 mg/L
    Cobalt (Co) 0.5 mg/L
    Chromium (Cr) 0.1 mg/L
    Copper (Cu) 0.2 mg/L
    Iron (Fe) 5.0 mg/L
    Lead (Pb) 5.0 mg/L
    Lithium (Li) 0.1 mg/L
    Manganese (Mn) 10.0 mg/L
    Nickel (Ni) 0.2 mg/L
    Selenium (Se) 0.1 mg/L
    Vanadium (V) 0.1 mg/L
    Zinc (Zn) 2.0 mg/L

  • (ii) For disposal of limited volumes of industrial wastewater and sludge of less than 10 percent solids, the following criteria shall not be exceeded:

    pH 4.5 - 9.0 s.u.
    Electrical Conductivity (EC) 3,250 micromhos/cm @25°C
    Total Dissolved Solids 2,100 mg/L
    Sodium Adsorption Ratio (SAR) 26
    Potassium In combination with sodium, will not produce an SAR greater than 26
    Chlorides (Cl-) 1,500 mg/L
    Sulfates (SO42-) 960 mg/L
    Bicarbonates (HCO3- ) Not greater than 50 percent of the total anion concentration, meq/L
    Arsenic (as H3AsO4, Arsenious Acid) 0.1 mg/L
    Boron (as H3BO3, Boric Acid) 2.0 mg/L
    Chromium (Cr) 1.0 mg/L
    Copper (Cu) 1.0 mg/L
    Nickel (Ni) 0.2 mg/L
    Selenium (Se) 0.2 mg/L
    Zinc (Zn) 2.0 mg/L
    Oil and grease 20,000 lbs/ac when soil incorporated (surface 6 inches) 2,000 lbs/ac when surface applied

  • (iii) All other continuous disposal land application systems will be approved on a site specific, case by case basis by use of the applicable standards and guidelines.

020-11 Wyo. Code R. § 11-55

Amended, Eff. 6/29/2018.