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Contact Tim Johnston, P. E.
(925) 447-5200
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Civil Engineering firm specializing in onsite wastewater engineering. We are experts in septic systems design and process water design. Tim Johnston, Principle is a Registered Civil Engineer and has many years experience. We are competent working through Regional Board and County permitting. Soil testing, surveying, percolation tests, soil profiles, engineering, problem diagnostics, expansions, replacements, etc.

We work throughout California on wineries, process facilities, slaughterhouses, residences, commercial facilities, etc.

Visit us online at or give us a call at (925) 447-5200

Professional Engineer number: Civil 66172
Contractor's State License Board Number: 499418