What Is a Mitigating Control?

Originally published by Jessica Urquhart.

When most people think about risk controls, they immediately focus on prevention – how to stop something bad from happening in the first place. But what happens when prevention isn't enough, or a failure slips through the cracks? That's where mitigating controls come into play.

Mitigating controls are the unsung heroes in our risk management toolkit. They don't stop an incident from occurring – instead, they reduce the impact if it does.

First responders and medical evacuation teams are powerful examples of mitigating controls – they reduce harm when incidents do occur.

Understanding Mitigating Controls in Simple Terms

Put simply, a mitigating control is something that minimises harm once the hazard has been triggered. Think of it like an airbag in a car. It doesn't stop the crash, but it reduces the severity of injuries if one occurs.

In workplaces, mitigating controls are vital for managing residual risk – the level of risk that remains even after prevention efforts are in place. They form the second line of defence when your preventative measures fail or are bypassed.

Real-World Examples of Mitigating Controls

To help make it real, here are a few everyday examples:

• Fire suppression systems in a commercial kitchen. They don't stop the fire from starting, but they control it quickly to prevent catastrophic damage.
• Emergency shutdown systems on machinery. If a critical fault occurs, these systems reduce harm by halting operations before it escalates.
• First aid and medical response. You can't undo an injury, but timely treatment can significantly reduce long-term harm or complications.
• Spill containment kits. They don't stop a spill from happening, but they help limit environmental and health impacts.
• Rescue and emergency crews, as shown above – essential when time is critical.

How Are Mitigating Controls Different from Preventative Controls?

Let's break it down:

• Preventative controls aim to stop the hazard from becoming an incident.
• Mitigating controls aim to reduce the consequences after the hazard has triggered the event.

Both are crucial, and most high-risk work environments need a layered approach with controls that prevent, detect, and respond.

Are Mitigating Controls Ever Critical Controls?

Absolutely. In high-consequence environments like mining, construction, or community services, mitigating controls can absolutely be critical. If a specific mitigating control is the only barrier between an event and serious harm – such as a fatality or major financial loss – it should be classified and treated as a critical control.

The key is to assess:

• The consequence if the control fails
• Whether there is anything else protecting you from harm

If the answer is "nothing else," or "this is our last line of defence," then it's a good candidate for a critical control.

Why Do Mitigating Controls Get Overlooked?

In my experience, many businesses unintentionally over-focus on prevention and under-resource mitigation. There's a common belief that if we just "do everything right," we won't need mitigation.

But this sets us up for failure when something does go wrong – and it certainly can.

A well-rounded risk program must accept that things can and do fail, and build resilience through smart, well-designed mitigating controls.

The Bottom Line

Mitigating controls might not stop the incident, but they play a critical role in limiting harm, protecting people, and supporting recovery. They are especially important in dynamic, high-risk, or complex environments – where prevention alone isn't always enough.

If you're unsure which of your controls are preventative or mitigating – or whether they're even controls at all – it's time to take a closer look. Getting this right could mean the difference between a near miss and a life-altering event.