Septic companies in National City, CA

What the ground in National City is like

The USDA soil survey rates mapped ground in National City for septic drain-field suitability across roughly 7.3 square miles. About 70% of the rated ground is classed "Very limited", the survey records severe restrictions for a conventional drain field across most of that ground.

In National City, 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 66% of the rated ground here.

The limiting features the survey records most often here:

• Slow water movement66.3%
• Slope18.5%
• Flooding7.7%
• Depth to saturated zone2.0%

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 · 70.1% Very limited · Slow water movement · 24 map units · 7.34 sq mi · read 2026-08-30