The state relies on backyard sewage treatment more than most. Out of sight and often neglected, Michigan’s more than one million septic systems are an overlooked health and environmental risk for the ...

Marin County has a pending update to its septic-system policy that would add subsurface drip to its list of allowed alternative systems.

With a conventional septic system, effluent flows into a septic tank, where solids settle on the bottom while liquids continue to a distribution box to be released in a drain field. A sand filter-drip ...