What is the minimum horizontal separation distance required between a drain field and a stream?

In West Virginia, the minimum horizontal separation distance required between a drain field and a stream is established to protect the water quality in nearby bodies of water and to ensure the proper functioning of septic systems. A separation distance of 20 feet helps to minimize the risk of contamination from effluent, which can adversely affect both surface water and groundwater integrity.

Maintaining this distance is important because it allows for adequate filtration and absorption of wastewater before it reaches the stream, thus reducing the likelihood of pollutants entering the waterway. The regulation is designed to promote public health and environmental sustainability, ensuring that the drainage from septic systems does not interfere with aquatic ecosystems or drinking water sources in proximity to the stream.

While other distances may seem sufficient, they do not provide the same level of protection and assurance as the established 20-foot requirement. This standard reflects a careful consideration of various factors, including soil type, topography, and the potential impacts of stormwater runoff, all of which inform the best practices for septic system installation and operation in the vicinity of flowing water.