How SPCC Tank Integrity Testing Works, Which Standard Applies (STI SP001, API 653), and Who Does the Work
If you store oil above ground at a New Jersey facility, a federal rule is probably asking you to check your tanks on a schedule. The Spill Prevention, Control, and Countermeasure (SPCC) rule, found in 40 CFR Part 112, requires every aboveground oil container of 55 gallons or more to be tested or inspected for integrity on a regular schedule, and again whenever you make material repairs. EPA doesn't write that schedule for you. The rule points to industry standards such as STI SP001 and API 653, and the SPCC Plan you've signed commits you to following whichever one it names. EPA Region 2 enforces the rule in New Jersey, and facilities that count as major facilities under the state's own discharge prevention rules face an additional layer of testing requirements from NJDEP.
In this article we'll walk through what the rule says, which containers it covers, how to decide which standard fits your tanks, how often inspections and tests come up, who's allowed to do the work, what New Jersey adds, and how to keep records that hold up when an inspector asks for them. If you'd rather hand the whole thing off, you're always welcome to reach out to RMA and we'll talk through your tanks with you.
Table of Contents
TL;DR
Yes. If your facility has aboveground oil containers of 55 gallons or more, the SPCC rule requires you to test or inspect each one for integrity on a schedule set by industry standards, and again after material repairs. Most shop-built tanks follow STI SP001, large field-erected tanks follow API 653, and whichever standard your SPCC Plan names is the one you're held to. Your own staff can handle the routine visual checks, but formal inspections come from certified inspectors, and New Jersey major facilities have stricter state testing and recordkeeping rules on top of the federal ones.
What Does the SPCC Rule Require for Bulk Container Integrity Testing?
The requirement lives in 40 CFR 112.8(c)(6). In plain terms, it asks for four things. You test or inspect each aboveground container for integrity on a regular schedule. You do it again whenever you make material repairs. You determine, in accordance with industry standards, who's qualified to do the work, how often it happens, and what type of testing fits the container's size, configuration, and design. And you keep comparison records, inspect each container's supports and foundations, and walk the outside of the container frequently for signs of deterioration, leaks, or oil collecting inside diked areas.
The rule lists examples of integrity tests, including visual inspection, hydrostatic testing, radiographic testing, ultrasonic testing, and acoustic emissions testing, along with other non-destructive methods. It doesn't pick one for you. It asks that the type and frequency follow industry standards, and EPA's bulk storage container fact sheet says that once your Plan names a standard, following the relevant parts of that standard becomes mandatory. A Plan that names SP001 while the facility only does an informal walk-around is the kind of gap regulators write up. We cover other common findings in our top SPCC plan violations article. Federal civil penalties for SPCC violations are assessed per day and adjusted for inflation each year under 40 CFR Part 19, so the exposure grows the longer a gap goes uncorrected.
Which Oil Containers Need SPCC Integrity Testing?
EPA's fact sheet says the testing and inspection requirement applies to aboveground bulk storage containers with a capacity of 55 gallons or more. That covers shop-built and field-erected containers, containers sitting on the ground, partially buried, bunkered, or vaulted, containers elevated off the ground, and double-walled containers.
Smaller portable containers count too. A 55-gallon drum is a bulk storage container under the rule, and our article on whether 55-gallon drums are included in SPCC plans explains how they're counted.
A few things sit outside this particular requirement. Oil-filled operational equipment, such as transformers and hydraulic equipment, isn't a bulk storage container, so it isn't subject to the integrity testing paragraph, although it has its own SPCC provisions. Completely buried metallic tanks fall under a separate regular leak testing requirement in 112.8(c)(4), and in New Jersey underground storage tanks also answer to NJDEP's rules in N.J.A.C. 7:14B. Animal fat and vegetable oil containers follow a parallel paragraph, 112.12(c)(6).
How Do You Choose Between STI SP001, API 653, and Other Industry Standards?
The rule doesn't name a single standard, so the choice comes down to what kind of container you have. The Plan preparer, or the Professional Engineer (PE) certifying the Plan, looks at how each tank was built and where it sits, then picks the standard whose scope covers it. EPA's guidance calls STI SP001 and API 653 the two commonly used inspection standards for aboveground bulk containers, and says one of them will fit most steel tanks at SPCC facilities.
| Standard |
What it covers |
Who does the formal work |
| STI SP001 |
Shop-fabricated tanks, small field-erected tanks, portable containers such as drums and totes, and the secondary containment around them |
Owner's qualified inspector for periodic checks. An STI certified inspector, or an API 653 inspector with the STI adjunct certification, for formal inspections |
| API 653 |
Large field-erected steel tanks built to API 650 and its predecessor specifications, including inspection, repair, alteration, and reconstruction |
API 653 certified inspector for formal in-service external and out-of-service internal inspections |
| API 510 or ASME Section VIII |
Containers operated under pressure (this is the route New Jersey specifies for pressurized tanks at major facilities) |
Inspector qualified under the applicable code |
| Site-specific (hybrid) program |
Deviations from a standard, or containers no standard fits, built from pieces of the standards plus good engineering practice |
PE certification of the equivalence when you deviate from an applicable standard |
In practice the decision runs through a few questions. Is the container shop-built or field-erected? How big is it, and is it steel? Is it elevated, on grade, or partially buried? Does it run at atmospheric pressure? Does it have secondary containment and a way to detect a release? The answers usually point to one standard, and once the Plan names it, you've committed to its schedule and qualifications. If you want to depart from the standard, a PE has to certify the reason and show how your approach protects the environment as well as the standard would. A Tier I qualified facility using the self-certified template can't deviate at all, and a Tier II qualified facility needs PE certification for any deviation. Our guide to the different types of SPCC plans shows where your facility lands.
How Often Does STI SP001 Call for Tank Inspections and Leak Tests?
STI SP001 sorts shop-built tanks into three categories based on spill control and release detection. Category 1 tanks have spill control and a continuous release detection method, such as a double wall or an elevated design where all sides can be seen. Category 2 tanks have spill control but no continuous release detection, such as a tank sitting in a dike with its shell touching soil. Category 3 tanks have no spill control. A Category 3 tank usually has a secondary containment problem too, which our article on SPCC oil spill containment sizing explains.
The table below shows the general shape of the SP001 schedule for shop-built tanks, as published in summaries of the standard's inspection schedule table. The standard describes three kinds of work. Periodic inspections are the monthly and annual checks done by the owner's qualified party. Formal external and formal internal inspections are done by a certified inspector. Leak tests are done by the owner or the owner's designee. Intervals are maximums.
| Tank size (gallons) |
Category 1 |
Category 2 |
Category 3 |
| Up to 1,100 |
Periodic only |
Periodic only |
Periodic, plus formal external inspection and leak test every 10 years |
| 1,101 to 5,000 |
Periodic only |
Periodic, plus formal external inspection and leak test every 10 years |
Periodic, plus formal external and leak test every 5 years and formal internal every 10 years, or leak test every 2 years with formal external every 5 years |
| 5,001 to 30,000 |
Periodic, plus formal external every 20 years |
Periodic, plus formal external every 10 years and formal internal every 20 years, or formal external every 5 years and leak test every 10 years |
Periodic, plus formal external and leak test every 5 years and formal internal every 10 years, or leak test every year with formal external every 5 years |
| 30,001 to 75,000 |
Periodic, plus formal external every 20 years |
Periodic, plus formal external and leak test every 5 years and formal internal every 15 years |
Periodic, plus formal external and leak test every 5 years and formal internal every 10 years |
Field-erected tanks under SP001 follow a more uniform pattern of periodic inspections, a formal external inspection every five years, and a formal internal inspection every ten. Portable containers such as drums and totes sit at the light end. EPA's guidance says that when portable containers have adequate secondary containment, SP001 allows visual inspection alone to satisfy the integrity testing requirement. STI released the seventh edition of SP001 in February 2024. Treat the table as a planning guide, and confirm every interval against the edition your Plan cites and the condition of your specific tank. API 653 works differently, with intervals tied to measured corrosion rates rather than a fixed table.
What Counts as a Material Repair That Triggers Retesting?
The rule says to test or inspect "whenever you make material repairs," and it doesn't hand you a checklist of which repairs qualify. The standards your Plan names do most of the work here. STI publishes a companion repair standard for shop-fabricated tanks, SP031, and API 653 has its own repair and alteration provisions for field-erected tanks. EPA's fact sheet notes that hydrostatic testing is typically done on new tanks and on existing tanks that have had major repairs or alterations.
Federal rules add a few related duties. If a field-constructed aboveground container undergoes a repair, alteration, reconstruction, or change in service that might affect its risk of discharge or failure due to brittle fracture, 112.7(i) requires you to evaluate the container for that risk and take appropriate action. Section 112.8(c)(10) separately requires prompt correction of visible discharges and prompt removal of oil accumulations in diked areas. In New Jersey, tanks at major facilities that fail an integrity inspection must be emptied and kept empty until they're repaired or replaced. A good working rule is to write down in your Plan what kinds of repair trigger a retest, log every repair when it happens, and have the inspector or PE sign off on the retest scope before the tank goes back into service.
Who Performs SPCC Tank Integrity Inspections and Tests?
Different tasks go to different people. EPA's fact sheet says the frequent external visual inspections, the routine walk-around that includes supports and foundations, can often be done by trained facility personnel. The regular integrity tests or inspections may need specialized personnel as specified by the standard. Under SP001, periodic inspections and leak tests can be handled by a qualified party the owner designates, while formal external and internal inspections go to an STI certified inspector or an API 653 inspector holding the STI adjunct certification. STI certification for SP001 inspectors expires after five years, so ask for current credentials.
Who builds the program depends on your Plan type. If a PE certifies your Plan, the PE works with you to set the inspection and testing program and may consult tank inspectors on frequency, type, and qualifications. If you're a qualified facility self-certifying the Plan, you can develop the program by following the protocols in the applicable standards or by bringing in tank inspection professionals. Tier I status generally means 10,000 gallons or less in aggregate aboveground storage, no single container over 5,000 gallons, and a limited spill history. Any time a Plan deviates from a standard, a licensed PE has to review and certify it, and our article on professional engineers and SPCC plan requirements explains when that comes up.
We'll also tell you when you don't need us for this piece. A small facility with a couple of Category 1 tanks and some drums in containment may only need periodic visual inspections that your own staff can handle, using the SP001 monthly and annual checklists. Those staff should be trained on what to look for, and our online environmental training library is one way to do that. The need grows when a tank lands in a category that calls for a certified inspector, or when nobody has written down who qualifies as the inspector.
How Do New Jersey's Discharge Prevention Rules Affect Tank Integrity Testing?
New Jersey has its own tank integrity rule for a specific group of facilities. Under N.J.A.C. 7:1E, the Department of Environmental Protection (NJDEP) regulates discharges of petroleum and other hazardous substances, and facilities that qualify as major facilities must prepare Discharge Prevention, Containment and Countermeasure (DPCC) and Discharge Cleanup and Removal (DCR) plans. Whether your facility is a major facility depends on its total storage capacity and what it stores, so check N.J.A.C. 7:1E against your own inventory. If you're a major facility, N.J.A.C. 7:1E-2.16 sets integrity testing protocols for aboveground tanks with a capacity greater than 2,000 gallons, and NJDEP amended that section in 2025. EPA Region 2 still enforces the federal SPCC rule separately, and our article on who enforces SPCC plans explains how the agencies divide the work.
| Tank type (over 2,000 gallons) |
New Jersey protocol |
| Field-erected steel, atmospheric |
API 653 and its schedule, with no similar-service or risk-based scheduling |
| Shop-built steel, atmospheric |
API 653 or SP001 and the schedule in that standard, with no risk-based API 653 scheduling |
| Steel, operated under pressure |
API 510 or ASME Section VIII, as applicable |
| Fiberglass reinforced plastic |
Every five years: acoustic emission testing under ASTM E1067 plus internal and external inspection by an experienced, qualified inspector |
| Homogenous plastic |
Every five years: internal and external visual inspections by an experienced, qualified inspector |
| Other tank types |
Every five years: shell and bottom thickness testing plus visual inspection of the interior, exterior, and foundation or supports |
The state rule also covers more than the schedule. Tanks placed into service on or after July 22, 1990 have to be integrity tested before they go into service, and shop-built tanks are tested after installation using a test such as a static head test. Tank integrity reports have to include specific details, including the test method, dates, results with calculations and the date of the next test, recommendations, and the inspector's qualifications such as API or STI certification. Within 120 days of getting a report, the owner reviews the findings, sets a repair scope, and documents in writing what was done about each recommendation, including the reasons for any that were delayed or deemed unnecessary. Reports are kept for the lifetime of the tank, and the DPCC plan itself has to show the dates of the last and next tests.
Facilities that aren't major facilities don't fall under 7:1E-2.16, but the federal SPCC requirement still applies to them, and NJDEP's discharge reporting duties apply to everyone. Local fire officials also enforce the Uniform Fire Code on tank work, so check with them before repairs or modifications. We walk through the state picture in more detail in SPCC plans in New Jersey.
How Do You Document SPCC Integrity Testing in the Plan and Your Records?
Documentation happens in two places. The Plan describes the program, and the files prove you're following it. For each container, the Plan should identify the type and frequency of testing and inspection, the applicable industry standard, and the qualifications of the personnel doing the work. Section 112.7(e) requires the inspections and tests to follow written procedures, and a record of each, signed by the appropriate supervisor or inspector, has to be kept with the Plan for three years. Records kept under usual and customary business practices satisfy that requirement. EPA recommends keeping formal test reports for the life of the container, and for New Jersey major facilities, integrity test reports are kept for the lifetime of the tank.
If you've never tested a container, EPA's fact sheet says to schedule integrity testing in accordance with the applicable standard as soon as possible, and to document that implementation schedule in the Plan. EPA's example suggests setting the first baseline inspection within the next five-year Plan review period. The five-year review is a natural point to check that the schedule, inspector qualifications, and standards in the Plan still match what's on site, and our article on SPCC plan five-year reviews covers that process. For the routine part of the program, our guide to the top 10 things to do during SPCC monthly inspections gives your staff a practical walk-around list.
What Drives the Cost of SPCC Tank Integrity Testing?
There are two separate costs here, and it helps to keep them apart. The first is the SPCC Plan work that sets up the program. Across all facility types, our published range for an SPCC Plan is $2,500 to $15,000, depending on the number of containers, the facility's complexity, and whether a PE certification is required. Our SPCC plan cost breakdown and our article on updating an existing SPCC Plan go deeper on both.
The second cost is the formal inspection or testing itself, and certified inspectors set those fees. We don't publish a range for them because they swing widely. The drivers include the number and size of the tanks, their SP001 category, how hard they are to reach, whether ultrasonic thickness testing is needed, whether you have baseline data, and whether an internal inspection is called for. EPA notes that internal inspections generally require taking the container out of service and cleaning it, so budget for downtime. The SPCC pricing calculator below gives you a ballpark for RMA's help with the Plan and program setup.
How Can RMA Help With SPCC Tank Integrity Testing?
We're a family-run firm based in New Jersey, and we've worked with facilities across the state and the country on SPCC Plans since 1992. For integrity testing, that usually means looking at your containers, working out which standard fits each one, writing the inspection program into your Plan, and setting up the checklists and recordkeeping so your staff knows what to do and when. When a tank calls for a certified inspector or your Plan needs a PE's review, we'll help you line those pieces up. If you don't need us, we'll say so.
There's no pressure and no obligation. You can call us at 888-RMA-0230, email us, or fill out the form on our website, and a member of our team will follow up. When you're ready to talk through your tanks, contact RMA and we'll take it from there.
