W. Va. Code R. § 64-5-4 - Classification of Wastewater Systems

4.1. A wastewater system is classified on the basis of the permitted flow capacity and complexity of wastewater treatment processes.

4.1.a. Class H - A lagoon, aerated lagoon, stabilization pond, recirculating media filter, package treatment plant, or a small wastewater system with flows less than 600 gpd. This rule does not apply to septic tanks serving individual homes.

4.1.b. Class S - A lagoon, aerated lagoon, stabilization pond, recirculating media filter, package treatment plant, or a small wastewater system with flows greater than 600 gpd, but less than or equal to 0.05 MGD. It can also be multiple individual septic tanks within a managed residential district. Individual home owner septic tanks are only included in this class if they are maintained under the jurisdiction of a responsible management entity. This classification was previously referred to as 1S.

4.1.c. Class C - A facility upstream of the wastewater treatment plant used to collect and convey wastewater. It may include pumps, valves, manholes, tanks and other appurtenances. These facilities are also known as a collection system. This class does not include Class S facilities.

4.1.d. Class I - A lagoon, aerated lagoon, stabilization pond or wastewater system with flows greater than 0.05 MGD, but less than or equal to 1.0 MGD. This class includes extended aeration package treatment plants with flows greater than 0.05 MGD, but less than or equal to 0.1 MGD.

4.1.e. Class II - A lagoon, aerated lagoon, stabilization pond or wastewater system with flows greater than 1.0 MGD, but less than or equal to 1.75 MGD. This class includes extended aeration treatment plants with flows greater than 0.1 MGD, but less than or equal to 1.75 MGD.

4.1.f. Class III - A facility with flows greater than 1.75 MGD but less than 6.0 MGD.

4.1.g. Class IV - A facility with flows equal to or greater than 6.0 MGD.

4.1.h. Advanced - A system designation held in addition to Class S and Class I through Class IV classifications, where advanced treatment methods are used such as: membrane filtration or separate nitrification; denitrification; phosphorous removal; ammonia stripping; breakpoint chlorination; carbon adsorption; chemical coagulation; flocculation; precipitation; demineralization ion exchange, reverse osmosis or electrodialysis; or other processes considered advanced by the Commissioner.

Notes

W. Va. Code R. § 64-5-4