Tree near septic drain field

Dowling Park, FL(Zone 8b)

Have moved to a new house which has a large, raised drain field. There is also a 8X10 ft tree "well" at one end. The bottom of the "well" -planting level - is at or below the bottom of the drain field.
Question: what tree is recommended to plant here that will not aggressively seek out the moisture of the drain field, resulting in drain pipe clogged with roots? I know our native cypress, willows, maples, etc all love water, send out strong lateral roots and would not be good choices.

An evergreen, conifer would be our first choice as this is a log house- and would add to the "setting" - any of these with "deep" tap-root come to mind?? (that will grow in N. FL)

I have also thought of an American holly...?? (root system growth pattern???)

All comments and suggestions welcome,

John
Jacksonville, FL

(Zone 5b)

I just looked up info on that recently...here's one of the links I found...

http://www.northbranchnursery.com/rc/tree-guide/leach-fields.html

Bluffton, SC(Zone 9a)

Long leaf pine has a long tap root but they seem to send out a decent amount of lateral roots.

Worse pick would be a willow.

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