|Areas That Are Highly Susceptible to Ground Water Contamination or in a Wellhead Protection area||10 Months||10 Months||3 Years|
|Areas Moderately Susceptible to Ground Water Contamination or in Shoreland area||10 Months||3 Years||5 Years|
|Areas with Low Susceptibility to Ground Water Contamination||10 Months||5 Years||10 Years|
* If a property in shoreland is also in a highly susceptible to groundwater contamination or wellhead protection area, the shortest time period applicable shall apply.
* A system that poses an imminent health threat is a system that discharges untreated sewage to the soil surface, surface waters, field tile, or into the interior of a building.
* * Vertical separation is the distance of sand or soil between the bottom of the distribution medium (usually drainfield rock) and the top layer of seasonally saturated soil or bedrock. At least three feet of vertical separation is required for systems installed after April 1, 1996, and for those systems located in a Shoreland or Wellhead Protection Area or serving a Food, Beverage or Lodging Establishment. Any other system is required to have at least two feet of vertical separation. See Minnesota Rules part 7080.1500, subpart 4D and 4E for more information.