Hazardous Waste Tank Certification in California

If you store or treat hazardous waste in above-ground tanks at your California facility, those systems need to be certified under Title 22 of the California Code of Regulations. Most facilities learn about this requirement when a CUPA inspector (typically from your local fire department) flags it during a routine visit. That can feel stressful, especially if it is your first time through the process.

Here is the good news: this is a well-defined process, and we have been doing it for over 30 years across every type of industrial and commercial facility in California. We come to your facility, conduct the full assessment, and deliver a PE-stamped certification that satisfies your regulator. Below, we walk through exactly what is involved so you know what to expect.

What Is a Hazardous Waste Tank Certification?

A hazardous waste tank certification is a comprehensive assessment of every tank system at your facility that stores or treats hazardous waste. It is required under 22 CCR Sections 66265.191 through 66265.196 and must be certified by a California-licensed Professional Engineer (PE).

The certification evaluates three areas: the structural and material integrity of each tank, the adequacy of secondary containment systems, and the seismic resilience of the installation. The final report includes engineering calculations, inspection findings, and the PE stamp attesting to compliance.

A Title 22 assessment is different from a standard tank integrity test or an underground storage tank (UST) inspection. The Title 22 hazardous waste tank certification covers secondary containment, seismic design, material compatibility, and other requirements that go beyond simple leak detection.

Who Needs a Hazardous Waste Tank Certification?

Any California facility using above-ground tanks to store or treat hazardous waste. This covers a wide range of industrial and commercial operations:

• Metal finishing and plating shops with treatment systems, acid tanks, or rinse water collection
• Fleet maintenance and auto service facilities with waste oil or waste coolant tanks
• Industrial and commercial manufacturing operations holding hazardous waste on-site before disposal
• Aerospace, electronics, and defense contractors with chemical treatment or neutralization systems
• Any facility with a neutralization tank, batch treatment system, or equalization tank handling hazardous streams

Large Quantity Generators (facilities producing more than 1,000 kg (about 2,200 lbs) of hazardous waste per month) receive the most inspector attention. But the requirement applies to any facility with qualifying tank systems, regardless of generator status. Not sure whether your systems qualify? Here’s a quick checklist to see whether your tanks qualify.

Why Most Facilities Reach Out

Three situations bring most clients to us. All three are routine and manageable.

A CUPA Notice or Inspection Finding

Your local Certified Unified Program Agency (CUPA), often the fire department, conducts a routine inspection and identifies that your tank certification is expired, incomplete, or has never been done. They issue a CUPA citation or notice with a deadline. Some inspectors provide a detailed checklist of what they expect in the report.

This is the most common starting point. If this is your situation, we can review your inspector’s correspondence and align our scope to their specific expectations.

Five-Year Recertification

Tank certifications are valid for five years from the inspection date. Your CUPA expects renewal before your five-year tank recertification is due. The specific due date can slip through the cracks, especially if the person who managed it last time has moved on. We track renewal dates for our clients so this does not happen.

New Tank Installation or System Modification

New hazardous waste storage or treatment tanks must be certified before being placed in service. Modifications to existing systems or changes in waste stream may also require a new assessment. Your CUPA can advise on whether a change triggers full recertification.

A Previous Assessment Was Rejected

You had a contractor perform a tank inspection, but your CUPA rejected the report. Standard tank integrity tests and UST inspections don’t satisfy the Title 22 requirement. We perform the full assessment (tank integrity, leak testing, seismic evaluation, secondary containment, and PE certification) so the report meets your regulator’s requirements the first time.

If any of these sound familiar, you are in the right place. We handle all of these situations routinely.

What the Certification Covers

The assessment follows 22 CCR Section 66265.192, which specifies design and operating requirements for hazardous waste tank systems. Here is what that looks like in practice.

Tank Integrity Assessment

We visually inspect each tank for signs of deterioration: corrosion on the shell, pitting, cracks, staining at fittings or weld seams, and degradation of gaskets or seals. We document the tank material, measure wall thickness where accessible, and evaluate compatibility with the waste stream. Tank age and expected remaining service life are recorded.

Leak Testing

We perform a static leak test on each tank. The tank is filled to operating capacity, all ports are closed, and we measure the liquid level at the start and end of a defined test period (typically three to four hours). For double-walled tanks, we also inspect the interstitial space for evidence of leakage. Where we cannot observe all tank surfaces, which is common even with above-ground tanks when access around or beneath the tank is limited, we use hydrostatic testing to confirm integrity.

Seismic Evaluation

California seismic requirements are a significant component. We document how each tank is anchored (bolt sizes, anchor plate dimensions, cable configurations, and attachment points) then perform site-specific seismic calculations to confirm the anchoring can withstand the design-level earthquake for your location. If modifications are needed, we specify exactly what is required.

Secondary Containment Evaluation

Under 22 CCR Section 66265.193, every hazardous waste tank must meet secondary containment requirements. For double-walled tanks, the outer wall is the containment. For single-walled tanks, it is typically a bermed area, vault, or lined sump.

We confirm that the containment prevents migration to soil and groundwater, detects and collects releases, is constructed of compatible materials, and has sufficient capacity. For outdoor installations, containment must hold 100% of the largest tank plus volume for the 25-year, 24-hour storm event. Secondary containment requirements also tie into SPCC plans for above-ground tanks for many facilities.

Piping Certification

If hazardous waste piping exceeds approximately ten feet or passes through walls, floors, or underground, it may also require certification. We perform hydrostatic testing, air pressure testing, or visual leak testing on piping systems as needed. Your CUPA inspector determines whether piping certification is required for your installation.

How the Process Works

Here is what to expect when you work with us. Most facilities move from first call to delivered report within a few weeks:

• Scoping and quote. Tell us how many tanks you have, the type of containment, your facility address, and whether you have a CUPA notice. We send a quote, typically the same day. If you have documentation from your inspector, forward it and we align our scope to their requirements.
• Scheduling. We coordinate the tank certification inspection walkthrough at a time that works for your facility. We bring everything needed for the full assessment, including leak testing equipment.
• On-site assessment. We conduct the complete inspection at your facility: visual assessment of every tank and containment system, measurements of anchoring hardware, photographs, and leak testing. For a facility with a couple of storage tanks, this is typically a single visit. Larger operations with complex treatment systems may require multiple visits to assess everything thoroughly.
• Engineering review and report. We complete the seismic calculations, review all findings, and prepare the PE-stamped certification report. You receive a comprehensive document attesting that your tank systems have been assessed per 22 CCR 66265.192 and are acceptable for continued use.
• Delivery and CUPA submission. The report is ready to submit directly to your regulator. If you need us to communicate with your inspector about timeline or findings, we handle that.

Timeline: several weeks from first site visit to final report for most facilities, depending on scope. If you are under a tight compliance deadline, let us know and we will work to accommodate it.

What to Expect at Your Facility

Most facilities we assess are in reasonable condition and certify without issue. The process is straightforward: we visit, we inspect, we deliver the report.

If something does need attention (a corroded anchor bolt, a containment coating that has worn) we let you know exactly what it is and what needs to happen. Our goal is to get your tanks certified, not to create extra work. In cases where a repair is needed, we can issue a conditional certification that becomes fully valid once the specific item is addressed. We tell you what to fix, you fix it, and you are done.

We have been doing this long enough to know what inspectors are looking for and what matters for the safety of your operation. You can expect a thorough assessment and a clear, usable report, not a list of problems. If you want to get ahead of the visit, here’s how to prepare your facility for the inspection.

What Affects Cost?

Every facility is different, and we tailor our scope to your specific situation. The main factors:

• Number of tanks and containment areas. A fleet shop with two waste oil tanks is a different scope than a treatment facility with 30 tanks across multiple containment zones.
• Complexity of the tank systems. Storage-only tanks are more straightforward than treatment systems with interconnected piping, neutralizers, and process equipment.
• Piping certification requirements. If your CUPA requires piping to be certified alongside the tanks, that adds to the scope.
• Facility location. Travel distance factors into scheduling and overall tank certification cost.

We keep costs down by being efficient on-site, communicating clearly with you and your regulator, and getting it done correctly the first time. A properly executed certification protects your facility from future liability and avoids the cost of re-work. We provide a detailed quote before any work begins.

Why Facilities Choose CDMS

• 30+ years of California tank certification experience. Metal finishing, electronics, aerospace, fleet maintenance, chemical processing, food distribution, we have assessed tank systems across every segment.
• PE-stamped certification included. The full assessment and PE-stamped report are part of our standard engagement. You are not coordinating between separate vendors.
• We come to your facility. We travel to your site with everything needed for the assessment, including leak testing. You do not need to bring anything to us.
• We know the regulation. When we stamp a certification, we are attesting that we covered every requirement in 22 CCR 66265.191 through .196, not just the items on a particular inspector’s checklist.
• We coordinate with your CUPA. If your inspector has questions about timeline or scope, we communicate with them directly.
• We track your renewal. Once certified, we note your five-year date and reach out before it comes due. You will not be caught off guard.

Frequently Asked Questions

How often does the certification need to be renewed?

Every five years from the inspection date, or sooner if the expected end of life of the tank system is less than five years. Significant modifications may also trigger a new assessment.

What is a CUPA?

CUPA stands for Certified Unified Program Agency: the local body that inspects your facility for hazardous materials and hazardous waste compliance. Depending on your county, this may be the environmental health department, fire department, or a standalone agency. We can help you identify which CUPA covers your facility.

For the issues that come up most often, see our guide to common CUPA violations.

Our facility has never had a tank certification. Is that a problem?

More common than you would think. Some facilities operate for years before an inspector flags the requirement. The process is the same whether it is your first certification or your fifth. We assess the current condition of your tanks and containment, and certify based on what exists today.

Our contractor already did a tank inspection, but our CUPA rejected it. Why?

A standard tank integrity test or UST inspection is not the same as a hazardous waste tank certification under Title 22. The Title 22 assessment covers secondary containment, seismic resilience, material compatibility, and requires a PE stamp. This is a common source of confusion. We can review what was done previously and complete the correct certification.

Do you certify piping?

Yes. If your hazardous waste piping exceeds approximately ten feet or passes through walls or underground, we include piping certification as part of the assessment.

What areas of California do you serve?

All of California. We are based in the Bay Area and Southern California, with efficient coverage from San Diego through the Central Valley to the Bay Area.