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Virginia Administrative Code
Title 18. Professional And Occupational Licensing
Agency 160. Board For Waterworks And Wastewater Works Operators And Onsite Sewage System Professionals
Chapter 30. Waterworks and Wastewater Works Operators Licensing Regulations
12/22/2024

18VAC160-30-360. Wastewater works.

A. A Class 4 wastewater works licensee may operate any wastewater works as follows:

1. A wastewater works employing biological mechanical methods (i.e., mechanical treatment process defined as those containing aerated and mixed flows using electrical or outside energy sources) with a design hydraulic capacity greater than 1,000 gallons per day but equal to or less than 0.04 MGD;

2. A wastewater works employing natural treatment methods (referenced in 9VAC25-790-870 as land treatment utilizing a secondary process for pretreatment followed by irrigation, overland flow infiltration-percolation, or combination thereof or aquatic ponds or constructed wetlands) with a design hydraulic capacity greater than 1,000 gallons per day but equal to or less than 1.0 MGD; or

3. Any other wastewater works classified by DEQ or VDH as a Class 4 wastewater works.

B. A Class 3 wastewater works licensee may operate any wastewater works as follows:

1. A wastewater works using biological treatment methods consisting of but not limited to (i) suspended growth reactors, (ii) aerated lagoons, (iii) constructed wetlands, (iv) filters or other attached growth contactors, (v) processes utilizing biological nutrient control, or (vi) processes utilizing land treatment having a design hydraulic capacity greater than 0.04 MGD, but equal to or less than 0.5 MGD;

2. A wastewater works using natural treatment methods (referenced in 9VAC25-790-870 as land treatment utilizing a secondary process for pretreatment followed by irrigation, overland flow infiltration-percolation, or combination thereof or aquatic ponds or constructed wetlands) with a design hydraulic capacity greater than 1.0 MGD;

3. A wastewater works using advanced waste treatment methods consisting of but not limited to (i) ammonia stripping, (ii) breakpoint chlorination, (iii) carbon adsorption, (iv) chemical coagulation, (v) flocculation, (vi) precipitation, (vii) filtration, or (viii) demineralization (i.e., ion exchange, reverse osmosis, or electrodialysis) having a design hydraulic capacity greater than 1,000 gallons per day but equal to or less than 0.1 MGD; or

4. A wastewater works classified by DEQ or VDH as a Class 3 or Class 4 wastewater works facility.

C. A Class 2 wastewater works licensee may operate any wastewater works as follows:

1. A wastewater works using biological treatment methods consisting of but not limited to (i) suspended growth reactors, (ii) aerated lagoons or constructed wetlands, (iii) filters or other attached growth contactors, (iv) processes utilizing biological nutrient control, or (v) processes utilizing land application having a design hydraulic capacity greater than 0.5 MGD but equal to or less than 5.0 MGD;

2. A wastewater works using advanced waste treatment methods consisting of but not limited to (i) ammonia stripping, (ii) breakpoint chlorination, (iii) carbon adsorption, (iv) chemical coagulation, (v) flocculation, (vi) precipitation, (vii) filtration, (viii) demineralization (i.e., ion exchange, reverse osmosis, or electrodialysis) and having a hydraulic capacity greater than 0.1 MGD but equal to or less than 2.5 MGD; or

3. A wastewater works classified by DEQ or VDH as a Class 2, Class 3, or Class 4 wastewater works.

D. A Class 1 wastewater works licensee may operate any wastewater works as follows:

1. A wastewater works using biological treatment methods consisting of but not limited to (i) suspended growth reactors, (ii) aerated lagoons or constructed wetlands, (iii) filters or other attached growth contactors, (iv) processes utilizing biological nutrient control, (v) processes utilizing land treatment and having a hydraulic capacity greater than 5.0 MGD;

2. A wastewater works using advanced waste treatment methods consisting of but not limited to (i) ammonia stripping, (ii) breaking chlorination, (iii) carbon adsorption, (iv) chemical coagulation, (v) flocculation, (vi) precipitation, (vii) filtration, (viii) demineralization (i.e., ion exchange, reverse osmosis, or electrodialysis) and having a design capacity greater than 2.5 MGD; or

3. A wastewater works classified by DEQ or VDH as a Class 1, Class 2, Class 3, or Class 4 wastewater works.

Statutory Authority

§§ 54.1-201 and 54.1-2301 of the Code of Virginia.

Historical Notes

Derived from Virginia Register Volume 33, Issue 11, eff. April 1, 2017; Errata, 33:15 VA.R. 1905 March 20, 2017.

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