California Septic Guide · Independent — not a government agency
Questions About Your California Septic System?
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Every guide on this site is sourced directly from the State Water Board OWTS Policy and county environmental health documentation — the five tiers, who issues your permit, ADUs, and costs, explained clearly.
How This Site Works
Independent guides, free tools, and a licensed local provider when you actually need one.
Read the guide for your situation
Every guide here is written from California state and county health department documentation — not from a contractor’s sales page.
Use the free tools to narrow it down
Cost estimators, a pumping calculator, a symptom checker and more. No signup, no email — they just tell you roughly what you’re dealing with.
Get connected with a local provider
When you’re ready for actual work, we’ll put you in touch with a licensed California septic professional. No cost, no obligation.
We’re an independent resource — not affiliated with any state or county health or environmental agency, and not a septic contractor. We may receive a referral fee from providers — it costs you nothing and doesn’t change what we publish. See our privacy policy.
Start Here: How California Works
What It Costs
Owning a Septic System
Buying, Selling & Building
Need Help With Your Septic System?
Tell us what’s going on and we’ll connect you with a licensed California provider. Free, and no obligation.
Independent — not affiliated with any state or county health or environmental agency, and not a septic contractor.