John Williams Underground Sewer

Certified septic pumping company · Stockton, CA · San Joaquin County

Certification status

Listed in the CSLB Licensed C-42 Sanitation System Contractors as of 2026-07-23 — verify current status at the official source

Certification categories

Installer (C-42)

License / registration #

1060903

Location

8001 North Stephens Road, Stockton, CA, 95215

Phone (from public registry)

(209) 401-4323

This profile is compiled from public registry records. It is not an endorsement, and The Septic Directory has no business relationship with John Williams Underground Sewer unless noted. Is this your company? Claim or correct this listing — it's free.

What septic pumping certification means

California licenses septic and sanitation system contractors under the C-42 (Sanitation System) classification through the Contractors State License Board; by law the board does not publish contractor email addresses.

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