Who Can Inspect SPCC Tanks: Certified Inspector vs Owner Inspection

Short answer: The SPCC rule does not name a credential. Under 40 CFR 112.8(c)(6), the owner or operator must decide, in line with industry standards, what qualifications the people doing tests and inspections need. In practice, trained facility staff do the routine monthly and annual inspections. A certified inspector does the formal ones: STI SP001 certified for shop-built tanks, API 653 certified for field-erected tanks. NDE technicians collect the data, and the certifying Professional Engineer (PE) sets the procedures in the Plan.

The confusion usually comes from mixing up these roles. An NDE technician with an ultrasonic thickness gauge is not the person who decides whether a tank stays in service. An API 653 inspector is not required for a monthly checklist walk-down. A PE certifying the Plan does not personally inspect every tank. This guide sets out who does what, which documents give each role its authority, and what to check before you hire. For the schedule side of shop-built tanks, see our companion guide to STI SP001 categories and intervals.

What the SPCC rule actually says about inspector qualifications

The Spill Prevention, Control, and Countermeasure (SPCC) rule, 40 CFR Part 112, is performance-based. It sets outcomes and leaves the method to industry standards and good engineering practice. Four provisions decide who can inspect:

• 40 CFR 112.8(c)(6), integrity testing. The owner or operator must test or inspect each aboveground container for integrity on a regular schedule and whenever material repairs are made. The rule then says the owner or operator must determine, in accordance with industry standards, the appropriate qualifications for personnel performing tests and inspections, together with the frequency and type of testing. Visual inspection, hydrostatic, radiographic, ultrasonic and acoustic emission testing are given as examples of methods.
• 40 CFR 112.3(d), PE certification. A licensed PE certifies that the Plan follows good engineering practice, including applicable industry standards, and that procedures for required inspections and testing have been established. EPA's guidance states that the certifying PE is responsible for establishing inspection and testing procedures for the facility.
• 40 CFR 112.7(e), records. Inspections and tests must follow written procedures developed by the owner/operator or the certifying engineer. The procedures and records, signed by the appropriate supervisor or inspector, must be kept with the Plan for three years.
• 40 CFR 112.3(g), qualified facilities. Smaller facilities meeting the Tier I or Tier II criteria may self-certify their Plans instead of using a PE. They still need an inspection programme based on industry standards.

For the testing methods themselves, see our guide to SPCC tank integrity testing requirements. So the answer to "who can inspect?" sits inside whichever industry standard the Plan adopts. For most facilities that is STI SP001 for shop-built tanks and API 653 for field-erected tanks. Both standards separate routine inspections by the owner's people from formal inspections by a certified inspector.

The five roles, side by side

One person can hold more than one role. A PE can also be an STI-certified inspector, and a large owner can employ its own API 653 inspector. Each act should still be signed in the capacity in which it is done, so the record shows which qualification supported it.

Owner inspections: monthly and annual checks by facility staff

Routine inspections are deliberately within reach of the facility's own people.

Under SP001. Periodic inspections are done on STI/SPFA's monthly and annual checklists, and portable containers such as drums and IBCs have their own checklist. STI/SPFA describes these inspections as work the tank owner or the owner's assigned, qualified inspector can perform. Industry summaries of the 7th edition (released in 2024) say it widened this to "a qualified party designated by the owner" for periodic inspections and leak tests. Confirm the exact wording in your licensed copy.

Under API 653. The code expects routine in-service visual monitoring of the tank exterior by owner/operator personnel, with the intervals set in the code. The people doing it do not need API certification. They should know the facility and the stored product. Our external inspection intervals article and API 653 intervals explainer cover the schedule.

What makes an owner inspection defensible in front of an EPA or state inspector:

• The Plan names the role, for example "terminal operator on shift" or "maintenance supervisor", and the person signing holds it.
• The person has been shown what to look for. A short documented briefing on the checklist items (leaks, interstice, water in containment, supports, coatings, vents, overfill devices) is good evidence.
• The checklist matches the edition of the standard the Plan cites.
• Findings lead to action. A monthly checklist that records the same weeping fitting for eight months shows the inspection is happening and the follow-up is not.
• Records are signed, dated and kept with the Plan for at least three years.

Formal inspections: STI SP001 and API 653 certified inspectors

Formal external and formal internal inspections need a certified inspector. The two certifications in use for SPCC tanks are:

STI SP001 Aboveground Tank System Inspector. STI/SPFA's published requirements are one of the following education and experience combinations:

• a Bachelor of Science degree and at least one year of experience;
• a two-year degree or certification in engineering or technology and at least two years of experience;
• a high school diploma or equivalent and at least three years of experience.

Candidates then complete STI/SPFA's SP001 inspector training and certification requirements. Certified inspectors keep the credential through follow-up training and a follow-up test. STI/SPFA also offers an SP001 Adjunct Certification to API 653-certified inspectors through an online process. That is how many API 653 inspectors cover shop-built tanks as well as field-erected ones.

API 653 Aboveground Storage Tank Inspector. This is awarded through API's Individual Certification Programs (ICP). API's published eligibility combines education with tank-related experience. Examples include a bachelor's degree in engineering or technology with one year of experience, a high school diploma with three years of tank-related work, or five or more years of experience. See API's API 653 certification page for the current combinations. Certification is valid for three years and then renewed. API ICP exams are delivered at Prometric test centres. API 653 is the usual credential for field-erected tanks built to API 650 or API 12C, and for the large tanks SP001 does not cover.

Which to hire? Match the credential to the standard your Plan names for each container. A facility with both shop-built and field-erected tanks can use one API 653 inspector who holds the SP001 adjunct, or separate inspectors. Before the work starts, check the certificate is current. STI/SPFA and API both offer verification. Our guide to verifying an API inspector certificate walks through the API side. If you are writing an RFP, our article on requiring API certifications in contractor RFPs covers the wording.

NDE technicians: the data behind the certified inspector's decision

Formal inspections depend on measurements. Most of those measurements are NDE: ultrasonic thickness readings, corrosion mapping of thinned areas, magnetic particle or penetrant testing at welds and attachments, floor scanning during internal inspections, and leak testing.

The SPCC rule lists several NDE methods by name in 112.8(c)(6), so the qualifications of the person running them fall under the same "in accordance with industry standards" test. In the US, the normal industry standard for NDE personnel is employer certification under a written practice that follows ASNT's SNT-TC-1A. Procedures are approved by an ASNT NDT Level III.

The certified tank inspector specifies what is measured and where. The NDE technician performs and reports the measurements to a written procedure. The certified inspector interprets them against the standard.

That split matters on three counts:

• Accountability. If a tank fails, the record must show who decided it was fit for service. That person needs the inspector credential, not just an NDE certificate.
• Data quality. A certified inspector without good thickness data is guessing. A technician who reports readings without marked locations, calibration records and a procedure reference gives the inspector numbers that cannot be used for a corrosion rate.
• Scope creep. Facilities sometimes ask an NDE contractor to "do the SPCC inspection". If the contractor has no certified tank inspector, what you get is data, not a formal inspection. Be explicit in the purchase order.

The PE's role, and qualified facilities that self-certify

Under 40 CFR 112.3(d), the PE certifies that the Plan has inspection and testing procedures in place and that it follows applicable industry standards. In practice, the PE:

• decides which containers fall under SP001 and which under API 653;
• confirms the SP001 category of each shop-built tank;
• writes or approves the facility's inspection procedures;
• names the roles responsible for each type of inspection.

The PE does not normally do the inspections, and certification does not relieve the owner of the duty to implement the Plan. If the PE is also a certified tank inspector, the two acts are still separate and should be signed separately.

Qualified facilities under 40 CFR 112.3(g) can self-certify the Plan. Tier I facilities have smaller aggregate capacity and no individual container above the rule's size limit. Tier II facilities meet the aggregate-capacity and spill-history criteria. Self-certification removes the PE, not the inspection obligation. The owner must still pick an industry standard, usually SP001 because qualified facilities mostly have shop-built tanks, and must use a certified inspector wherever that standard calls for a formal inspection.

Common mistakes about who can inspect

• Using an API 653 inspector for SP001 formal inspections without the adjunct. If the Plan adopts SP001, check that the inspector's credential covers it.
• Hiring an NDE contractor and calling it the formal inspection. Thickness readings without a certified inspector's evaluation and report do not complete a formal inspection.
• No named owner's inspector. Monthly checklists signed by whoever is free, with no designation in the Plan, are hard to defend.
• Expired certificates. API 653 certification runs for three years, and SP001 certification needs follow-up training and testing. Check dates before the job, not after.
• Assuming EPA inspectors certify tanks. EPA and state inspectors check compliance with the rule. They do not inspect tanks for suitability, and passing a regulatory inspection is not a formal tank inspection.
• Treating the PE certification as permanent. When tanks are added, replaced or re-categorised, the Plan and its inspection procedures need review, and technical amendments need recertification under the rule.

State programmes and Canada

Some states run their own aboveground tank programmes on top of SPCC. California's Aboveground Petroleum Storage Act, enforced by local Certified Unified Program Agencies (CUPAs), is the most visible example, and CUPA inspectors routinely review SP001 checklists. Other states have tank registration, fire-marshal or environmental rules that can add inspection or personnel requirements. Check with your state environmental agency and fire marshal.

In Canada there is no SPCC rule. Aboveground petroleum tanks fall under provincial and territorial fire codes and environmental regulations, the federal Storage Tank Systems for Petroleum Products and Allied Petroleum Products Regulations on federal lands, and the CCME environmental code of practice for storage tank systems. Who may inspect is set by those instruments and the authority having jurisdiction. Some Canadian owners use SP001 or API 653 inspectors voluntarily.

For NDE personnel in Canada:

• The Canadian General Standards Board closed on 1 April 2026.
• Natural Resources Canada's NDT Certification Body continues to certify NDT personnel.
• Many US-owned operations also accept ASNT SNT-TC-1A employer certification.

See our Canada consulting page for how Atlantis supports Canadian sites.

How Atlantis supports SPCC tank inspections

Atlantis NDT supplies the NDE part of the job:

• ultrasonic thickness surveys at marked locations;
• corrosion mapping;
• MT, PT and VT;
• tank-floor scanning with UT prove-up during internal inspections.

The work is done by ASNT-certified technicians to procedures approved by an ASNT NDT Level III. Results go to your STI SP001 or API 653 certified inspector, who stays the inspector of record and makes the suitability and interval decisions. Your PE stays responsible for the Plan. We have supported more than 1,500 inspection activities and trained more than 1,000 technicians. That includes facility staff who want to understand thickness data under an SNT-TC-1A written practice. Training is ASNT-based only. We do not offer STI or API inspector certification courses. See aboveground storage tank inspection, or ask for an NDE scope to support your certified inspector. You will have a quote within 24 hours.

Frequently asked questions

Who can perform SPCC tank inspections?

The owner decides, in line with the industry standard the Plan adopts. Under SP001 and API 653, trained facility staff do routine monthly and annual inspections, and a certified inspector (STI SP001 or API 653) does formal external and internal inspections.

Does an SPCC tank inspection require a certified inspector?

Formal inspections do, under SP001 and API 653. Routine periodic inspections do not. They are done by the owner's designated inspector using the standard's checklists.

Can facility employees do the monthly SPCC inspection?

Yes. Under SP001 the monthly and annual checklists are designed for the owner's inspector. Name the role in the Plan, brief the people who fill the checklists in, and keep signed records for at least three years.

What is the difference between an STI certified inspector and an API 653 inspector?

An STI SP001 inspector is certified by STI/SPFA for shop-built tanks, small field-erected tanks and portable containers. An API 653 inspector is certified through API's ICP for field-erected tanks. API 653 inspectors can add an SP001 adjunct certification through STI/SPFA's online process.

How do you become an SP001 certified inspector?

STI/SPFA requires a combination of education and experience: a BS plus one year, a two-year degree or certification plus two years, or high school plus three years. You then complete STI/SPFA's SP001 inspector training and certification requirements, with follow-up training and testing to keep the credential.

Can a Professional Engineer inspect SPCC tanks?

The PE certifies the Plan and establishes the inspection procedures. Doing a formal tank inspection under SP001 or API 653 needs the relevant inspector certification, so a PE who does both should hold it and sign each role separately.

Can an NDT company do my SPCC formal inspection?

Only if it provides a certified tank inspector who evaluates the data and issues the formal report. Otherwise the NDT company supplies measurements, which your certified inspector uses. Atlantis supplies the NDE and works with your inspector of record.

How long are SPCC inspection records kept?

40 CFR 112.7(e) requires inspection and test records, signed by the appropriate supervisor or inspector, to be kept with the SPCC Plan for three years. Keep thickness data longer if you want usable corrosion rates.

Who decides how often SPCC tanks are inspected?

The adopted industry standard sets the maximum intervals. The certifying PE establishes the procedures in the Plan. The certified inspector can shorten the next interval based on findings.

Need NDE support for upcoming formal inspections? Contact our inspection team, or ask about ASNT-based training for your staff. For the qualifications side of NDT personnel, see ASNT certification.