Your SPCC plan tier is not a choice you make; it is a determination you calculate. Under 40 CFR Part 112, the tier follows directly from three facts about your facility: aggregate aboveground oil storage capacity, the size of your largest container, and your recent spill history. Get the determination wrong and the plan you build on it is invalid, which is one of the more common and avoidable SPCC findings. This guide walks through whether the rule applies to you at all, then how to place your facility in the correct tier and what that tier requires.
First: is your facility subject to the SPCC rule?
Before tiers matter, confirm the rule applies. An SPCC plan is mandatory when a facility meets all three of these conditions:
- Aggregate aboveground oil storage capacity exceeding 1,320 U.S. gallons (counting containers of 55 gallons or more);
- It is a non-transportation-related facility; and
- It could reasonably be expected to discharge oil in harmful quantities into navigable waters of the United States.
For most Texas production and midstream sites, the geography makes the third condition easy to meet, so the practical rule of thumb is this: if your aggregate aboveground capacity exceeds 1,320 gallons, assume the SPCC rule applies and determine your tier.
SPCC tiers vs. the other "tiers" in regulation
The word "tier" shows up all over environmental regulation, and mixing them up is a real source of error. Three unrelated systems use it:
- SPCC facility qualification tiers (Tier I and Tier II) under 40 CFR Part 112, the subject of this guide.
- EPCRA Tier I / Tier II chemical inventory reporting forms, a completely separate hazardous-chemical reporting program.
- EPA engine emission tiers (Tier 1 through Tier 4) for non-road diesel engines.
They are not related, and a plan built on the wrong "tier" concept is a plan built on sand. Everything below is strictly about SPCC facility qualification.
Tier I vs. Tier II vs. non-qualified: the criteria
Storage capacity, container size, and spill history decide the tier. Misreading any one of them produces an incorrect classification and an invalid plan.
| Criterion | Tier I qualified (§112.3(g)(1)) | Tier II qualified (§112.3(g)(2)) | Non-qualified facility |
|---|---|---|---|
| Aggregate aboveground capacity | 10,000 gallons or less | 10,000 gallons or less | Greater than 10,000 gallons |
| Individual container size | No container greater than 5,000 gallons | No container greater than 5,000 gallons | No restriction (any size permitted) |
| Spill history (prior 3 years) | Must meet both: no single discharge over 1,000 gallons, and no two discharges over 42 gallons each in any 12-month period. | Cannot meet the Tier I spill-history conditions. This is the defining difference from Tier I. | Spill history does not affect qualification. |
What each tier requires
The tier determines the plan's complexity, certification, and cost. It is a direct consequence of the facility's data, not a preference.
| Requirement | Tier I | Tier II | Non-qualified |
|---|---|---|---|
| Plan certification | Self-certified by the owner/operator | Self-certified by the owner/operator | Certified by a licensed Professional Engineer (PE) |
| EPA template | Permitted (streamlined template) | Not permitted; must develop a full plan | Not permitted; requires a comprehensive PE-stamped plan |
| PE involvement | Not required | Not required unless an environmental-equivalence determination is made | Mandatory; the PE stamp is a legal requirement |
| Note | Self-certified is not the same as less stringent; the plan must still address all applicable §112.7 requirements. | A Tier II designation reflects a higher-risk profile, so the plan needs more robust procedural detail. | The highest standard of review, and the strongest liability position for complex or high-capacity sites. |
Because the tier drives cost, operators sometimes ask whether they can classify a facility down a tier to save money. The answer is no: it is a technical determination from fixed data, and forcing a facility into a lower tier to cut cost is a direct route to an invalid plan and regulatory exposure, where fines can reach tens of thousands of dollars per day, per violation. For how those costs actually break down, see our guide to what an SPCC plan costs.
How Tektite helps
The tier determination is quick when the data is clean and costly when it is wrong, and it sets the trajectory for the whole plan. Tektite provides SPCC plan development for Texas operators, confirming the correct tier from your capacity, container sizes, and spill history and building a plan that matches, whether that is a self-certified Tier I plan or a PE-certified plan for a larger site. If you are not certain which tier your facility falls into, that determination is the right place to start.
Related reading
Frequently Asked Questions
Are SPCC facility tiers the same as EPCRA Tier I/II reporting?
No. This post covers SPCC facility qualification tiers defined in 40 CFR Part 112, which are separate from the chemical inventory Tier I/II forms reported under EPCRA. Confusing the two is a frequent source of compliance error, so accurate SPCC tier determination is fundamental to correct SPCC plan development and tier determination.
When is my facility subject to the SPCC rule?
An SPCC plan is mandatory when a facility meets all three conditions: aggregate aboveground oil storage capacity exceeding 1,320 U.S. gallons, being non-transportation-related, and reasonably being expected to discharge oil into navigable waters of the United States.
What distinguishes a Tier I from a Tier II qualified facility?
Both have 10,000 gallons or less aggregate aboveground capacity with no individual container over 5,000 gallons. The difference is spill history: a Tier I facility must have had no single discharge over 1,000 gallons and no two discharges over 42 gallons each within any 12-month period, while a Tier II facility cannot meet those spill history conditions.
Can I use the EPA template and self-certify my SPCC plan?
Tier I and Tier II qualified facilities can both be self-certified by the owner/operator, but only Tier I permits use of the EPA's streamlined template; a Tier II facility must develop a full plan document. Non-qualified facilities require a comprehensive plan certified by a licensed Professional Engineer.
