Septic companies in Novato, CA

What the ground in Novato is like

The USDA soil survey rates mapped ground in Novato for septic drain-field suitability across roughly 27 square miles. About 89% of the rated ground is classed "Very limited", the survey records severe restrictions for a conventional drain field across most of that ground.

In Novato, the leading limit is depth to bedrock: rock sits close enough to the surface that there is not enough soil column above it for a conventional field to sit in. Effluent needs that depth to disperse; when bedrock comes up, the workable layer runs out. The survey flags that limit on about 63% of the rated ground here.

The limiting features the survey records most often here:

• Depth to bedrock63.2%
• Slope63.2%
• Slow water movement39.1%
• Seepage, bottom layer34.7%

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 · 88.7% Very limited · Depth to bedrock · 34 map units · 27.37 sq mi · read 2026-08-30