Summary
In short
- Foul drainage goes to treatment; surface water drainage goes to a watercourse. Which one received the spill determines whether this is an operational event or a pollution incident.
- Under CERCLA, a release of a listed hazardous substance at or above its reportable quantity within 24 hours requires immediate notification to the National Response Center.
- The oil sheen rule means a discharge to navigable waters that causes a visible film requires notification, regardless of volume. Small releases can be reportable.
- SPCC plans under 40 CFR 112 apply to facilities above oil storage thresholds and require secondary containment, plan review every five years, and reporting of certain discharge events to the EPA regional administrator.
- Photographs taken during the response are evidence that cannot be reconstructed. Extent, containment, drainage entry and remediation all become disputed weeks later.
- The most useful preventive output of a spill report is the cause. Most spills trace to decanting, delivery connection, container condition or a bund that was full of rainwater.
What it is
What it is
What is a spill report?
A record of an uncontained release of a substance: what was released, how much, where it went, what was done immediately, and whether it meets a threshold requiring notification to a regulator. It is created at the time of the event, because the information it needs is not recoverable afterwards.
When must a spill be reported to a regulator?
When it meets a defined threshold, which varies by substance and jurisdiction. In the United States, releases of hazardous substances at or above their reportable quantity under CERCLA require immediate notification to the National Response Center. Oil discharges to navigable waters causing a sheen carry their own notification duty. Permit conditions frequently impose additional and stricter triggers.
When to use it
When to use it, and when not to
This record captures a release event. Several related documents surround it and should not be merged into it.
Use it for
- Any uncontained release of oil, chemical, effluent or waste, regardless of apparent size
- A release contained by a bund or interceptor, which is still an event with a cause worth recording
- Near misses: a delivery connection failure caught before product escaped
- Releases by contractors or delivery drivers on your site
- Any event triggering, or potentially triggering, regulatory notification
Not for
- The spill response plan, which is the standing document describing arrangements
- The drainage survey, which maps where drains go and is referenced by this report under pressure
- Regulatory notification itself, which is a separate submission with its own timing and content requirements
- Waste consignment and disposal records for recovered material, which follow their own regime
- The interceptor maintenance record, which is an asset inspection rather than an incident
Standards
What it is built against
Spill obligations combine a prevention regime, an immediate notification duty triggered by quantity, and permit conditions that are frequently stricter than either.
| Clause | Requirement | Where it lands |
|---|---|---|
| 40 CFR 112 | SPCC plan, secondary containment, inspections and five-yearly plan review for qualifying oil storage | Header |
| 40 CFR 112.4 | Reporting to the EPA regional administrator following defined discharge events | Severity and reporting |
| 40 CFR 110.3 | Discharge of oil causing a film or sheen on navigable waters is prohibited and reportable | Where it went |
| 40 CFR 302.6 | Immediate notification to the National Response Center for hazardous substance releases at or above reportable quantity | Severity and reporting |
| EPCRA 304 | Notification to state and local emergency planning bodies for certain releases | Severity and reporting |
| Clean Water Act 311 | Prohibition on discharge of oil and hazardous substances in harmful quantities | Where it went |
| CEPA and provincial regs | Canadian notification duties for releases exceeding prescribed quantities, with immediate reporting | Severity and reporting |
| ISO 14001 cl.8.2 | Emergency preparedness and response, with periodic testing and revision after incidents | Immediate response |
What it does not cover
- Regulatory notification, which is a separate submission to a named body within a stated period, distinct from your internal record.
- The drainage survey, which maps the network and should be consulted rather than reconstructed.
- Root cause analysis, which belongs in its own record where the spill is significant or repeating.
- Waste transfer documentation for recovered material and contaminated absorbent.
- The SPCC plan itself, which is a standing certified document reviewed every five years.
Filling it in
Filling it in well
A spill report is written under pressure by someone who is also managing the response. The fields that matter most are the ones only obtainable at the time.
Before quantity, before cause, before anything else: did it reach a drain, and which kind. That single fact determines the notification decision, the containment priority and the eventual liability. If it is not known, the correct entry is that it is not known and that the drainage survey is being checked, not a guess that will be relied on.
Extent of spread, the containment applied, whether material entered a gully, the condition of the bund or container. All of this changes within an hour and none of it can be reconstructed. Photographs taken during the event are the evidence that resolves disputes about extent and about whether the response was adequate.
Quantity drives the notification threshold. An estimate recorded as a bare number invites challenge; an estimate recorded with its basis, container size and level before and after, area covered and depth, or delivery meter reading, is defensible. Under-estimating to stay below a threshold is a decision that will be examined closely if it later proves wrong.
Spills cluster around a small number of causes: decanting without a drip tray, delivery connection failure, corroded or damaged containers, overfilling, and bunds already full of rainwater with no capacity left. Recording which one lets the pattern emerge across events, and the pattern is where prevention lives.
Audit findings
Common audit findings
Spill findings concentrate on the notification decision, on containment capacity, and on evidence that was never captured.
| Finding | Clause | What fixes it |
|---|---|---|
| Receiving drainage not identified, so the notification decision had no basis. | 40 CFR 110.3 | Mark drains physically foul or surface water; a drawing in an office is not available at 7pm. |
| Reportable quantity threshold reached without immediate notification. | 40 CFR 302.6 | Hold the RQ list for substances on site and make the threshold check part of the report. |
| Bund or secondary containment full of rainwater, so it had no capacity. | 40 CFR 112.8 | Manage bund water as a routine task; a full bund is not containment. |
| No photographs taken during the response. | ISO 14001 cl.8.2 | Make image capture part of the response, not part of the write-up afterwards. |
| Quantity estimated with no recorded basis. | 40 CFR 302.6 | Record how the estimate was reached; it determines the notification threshold. |
| Spill kit located centrally rather than at the risk point. | ISO 14001 cl.8.2 | Site kits where spills occur: delivery points, decanting, transfer and storage. |
| Interceptor silted or unmaintained, so it did not separate. | 40 CFR 112.7 | Register interceptors as assets with an inspection and emptying schedule. |
| Cause not recorded, so no pattern is visible across events. | ISO 14001 cl.10.2 | Use a fixed cause list: decanting, delivery, container, overfill, containment capacity. |
| Contractor or delivery driver spill not recorded as an event. | ISO 14001 cl.8.1 | Record all releases on your site regardless of who caused them. |
| SPCC plan not reviewed within five years or not amended after a change. | 40 CFR 112.5 | Review every five years and amend on any change affecting discharge potential. |
Worked case
Case in point: fifty litres and two different outcomes
Two sites in the same business spilled comparable quantities of hydraulic oil from a delivery connection within a month of each other. At the first, the responder recognised the gully as surface water from a painted blue marking on the kerb, blocked it with a drain mat from a kit twenty metres away, and contained the spill on hardstanding. The event was recorded, the cause was traced to a worn coupling, and the coupling was replaced across the fleet.
At the second, the drain was unmarked. The responder assumed it was foul, applied absorbent around the spill and let the rest run. It was surface water, and it discharged to a ditch feeding a watercourse. The regulator was notified by a member of the public before the site knew where the oil had gone.
The substance, the quantity and the cause were the same. The difference was a painted marking and a kit within reach.
Definitions
Definitions and key terms
- Reportable quantity
- The threshold for a listed hazardous substance above which a release within 24 hours triggers immediate notification under CERCLA.
- Sheen rule
- The provision making an oil discharge to navigable waters that causes a visible film or sheen prohibited and reportable, regardless of volume.
- Foul drainage
- Drainage carrying wastewater to treatment. A spill here is usually a cost and a discussion with the treatment operator.
- Surface water drainage
- Drainage discharging to a watercourse, usually untreated. A spill here is a pollution incident.
- Secondary containment
- Bunding or equivalent sized to retain a release, which requires available capacity rather than merely existing.
- Interceptor
- A separator removing oil from surface water runoff, which fails silently as it silts up and continues to look functional.
- SPCC plan
- Spill Prevention, Control and Countermeasure plan required under 40 CFR 112 for qualifying oil storage facilities.
- National Response Center
- The US point of contact for immediate notification of hazardous substance and oil releases.
FAQ
Frequently asked questions
Why does the receiving drain matter more than the quantity?+
Because it determines the consequence. Fifty litres into foul drainage reaches treatment and produces a cost and a conversation. The same volume into surface water reaches a watercourse and becomes a pollution incident with notification duties, potential prosecution and remediation liability. Responders need to distinguish them physically, at the drain, in seconds.
When is notification required in the United States?+
Immediately, to the National Response Center, where a listed hazardous substance is released at or above its reportable quantity within 24 hours under CERCLA. Separately, an oil discharge to navigable waters causing a sheen is reportable regardless of volume. State and local notification under EPCRA may also apply, and permit conditions frequently impose stricter triggers than any of these.
Should contained spills be recorded?+
Yes. A spill caught by a bund or drip tray had the same cause as one that escaped and differed only in luck. Recording contained events is how the cause pattern becomes visible early, and it is considerably cheaper to learn from a contained release than from a reportable one.
What is the most common preventable cause?+
Across most operations: decanting without a tray, delivery connection failures, container condition and overfilling. A close fourth is secondary containment with no available capacity because it is full of rainwater, which converts a designed control into a decorative one. All four are addressable and all four recur where the cause field goes unrecorded.
How often must an SPCC plan be reviewed?+
At least every five years under 40 CFR 112.5, and amended whenever there is a change in facility design, construction, operation or maintenance that materially affects discharge potential. The change-driven amendment is the one most often missed, because a new tank or a re-routed line rarely prompts anyone to open the plan.
The agents
What the agents do with it
The report is short and written under pressure. What fails is the drainage answer nobody could give, and the cause field that stayed blank across forty events.
Holds the drainage map, the substance register with reportable quantities, and starts the notification clock when a threshold is reached.
Trends causes across spills and near misses, so decanting or delivery connection failures surface as a pattern rather than as forty separate events.
Registers bunds and interceptors as assets with inspection and emptying schedules, since containment with no capacity is not containment.
Connects the response to exposure and first aid where the substance also presents a health hazard to responders.
This template lives in KnowEnviro — environment and energy. Aspects, permits, waste, emissions, spills and sustainability reporting.
Sources
Sources
- 40 CFR Part 112, oil pollution prevention and SPCC requirements, EPA
- 40 CFR 110.3, discharge of oil causing a sheen, EPA
- 40 CFR 302, designation, reportable quantities and notification, EPA
- EPCRA Section 304, emergency release notification
- Clean Water Act Section 311, oil and hazardous substance liability