Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-19 - Commercial and Industrial Wastes and/or Domestic Wastes Greater Than 2000 Gallons per Day

Current through July 13, 2024
(a)
				Commercial/industrial wastewater systems or combination commercial/industrial
				and domestic wastewater systems are subject to applicable requirements listed
				in sections
				1 through
				15 of this chapter, in addition to
				requirements in this section.
(b)
				If the wastewater is classified as, or determined to be hazardous, toxic,
				and/or contain petroleum products, the applicant shall demonstrate to the
				Administrator that any discharge or seepage from the wastewater facility will
				not cause a violation of the surface and/or groundwaters of the state in
				accordance with Chapter 1, "Quality Standards for Wyoming Surface Waters" and
				Chapter 8, "Quality Standards for Wyoming Groundwaters."
(c) If the impact of the hazardous, toxic,
				and/or petroleum products cannot be determined and mitigated, disposal of the
				wastewater using a soil absorption system shall be prohibited.
(d) Pre-treatment of the wastewater to remove
				the hazardous, toxic, and/or petroleum products shall be required prior to
				disposal if deemed necessary to protect the Groundwater(s) and Surface Water(s)
				of the State.
(e) The minimum
				horizontal setback distances (in feet) shown in Table 7 shall be maintained for
				commercial and industrial wastes and/or wastes greater than 2000 gallons per
				day but less than 10,000 gallons per day.
Table 7. Minimum Horizontal Setbacks for Commercial
				  and Industrial Wastes in Feet1
From
To Septic Tank Or Equivalent
To Absorption System
Wells (includes neighboring wells)
50
200
Public Water Supply Well
100
5002
Property Lines
10
10
Foundation Wall (w/o drains)
5
10
Foundation Wall (with drains)
5
50
Potable Water Pipes
25
50
Septic Tank
N/A
10
Surface Water, Spring (including seasonal and
						  intermittent)
50
100
Cisterns
50
50
1 For systems larger than 10,000
				  gallons per day, the isolation distance shall be determined by a
				  hydrogeological study in accordance with Section
				  17(b) of Chapter 3, but
				  shall not be less than those shown in Table 7.
2 Wastewater systems that discharge to
				  the same aquifer that supplies a public water supply well and are located
				  within Zone 1 or 2 (Attenuation) of the public water supply well, as determined
				  by
Wyoming Department of Environmental Quality Source Water Assessment
				  Project (2004)
or as established in Section
				  2 of the
Wyoming Wellhead
				  Protection Guidance Document (1997)
, shall provide additional
				  treatment. These systems will be required to obtain an individual permit to
				  construct and will require that a PE sign, stamp, and date the application, as
				  stated in Section
				  2 of this chapter. The additional treatment
				  shall be in accordance with Chapter 3, Section
				  2(b)(ii). The treatment
				  shall reduce the nitrates to less than 10 mg/L of NO3-
				  as N and provide 4-log removal of pathogens before the discharge leaves the
				  property boundary of each small wastewater system.