Septic companies in Nampa, ID

What the ground in Nampa is like

The USDA soil survey rates mapped ground in Nampa for septic drain-field suitability across roughly 36 square miles. About 55% of the rated ground is classed "Somewhat limited", meaning the limits can usually be overcome or reduced by special planning, design or installation.

In Nampa, the leading limit is slow water movement: effluent does not drain through the soil fast enough, so a conventional field can back up or pond when the ground cannot keep pace. The survey flags that limit on about 88% of the rated ground here.

The limiting features the survey records most often here:

• Slow water movement88.2%
• Depth to cemented pan31.7%
• Depth to saturated zone13.4%
• Seepage, bottom layer9.9%

This is survey data for mapped areas, not a substitute for a site evaluation on your own lot. Conditions on a single parcel can differ from the map.

USDA NRCS SSURGO, ENG Septic Tank Absorption Fields · 54.8% Somewhat limited · Slow water movement · 53 map units · 36.07 sq mi · read 2026-08-30