Septic companies in Modesto, CA

What the ground in Modesto is like

The USDA soil survey rates every mapped parcel for its suitability as a septic drain field. Across Modesto's 43.4 square miles, 57.3% of the rated ground is classed "Very limited", meaning restrictions severe enough that a conventional field is often unsuitable and an engineered system may be required.

The limiting features the survey records most often here:

• Slow water movement80.2%
• Seepage, bottom layer17.6%
• Flooding12.8%
• Depth to saturated zone11.5%

The most common soil series underfoot: Hanford, Dinuba, Modesto.

This is survey data for the area, not a substitute for a site evaluation on your own lot. A soil scientist or your county health department tests the actual parcel, and the result can differ from the map.

USDA NRCS SSURGO, ENG Septic Tank Absorption Fields · 61 map units · read 2026-08-30