6.2 Leak Repair Requirements and Trigger Rates
Key Takeaways
- Trigger rates: 10% for comfort cooling, 20% for commercial refrigeration, 30% for industrial process
- Leak repairs must be completed within 30 days of discovery
- Verification testing must be done within 30 days of repair
- 2026 HFC rule applies to systems with 15+ lbs (down from 50 lbs for ODS)
- Leak rate = (refrigerant added / total charge) x 100, annualized to 12 months
6.2 Leak Repair Requirements and Trigger Rates
EPA Section 608 establishes specific leak rates that trigger mandatory repair requirements. These "trigger rates" vary by equipment type and are among the most heavily tested topics on the exam.
Leak Rate Trigger Rates
When an appliance containing 50 or more pounds of ODS refrigerant (or 15+ lbs of HFC under the 2026 rule) exceeds the applicable leak rate, the owner or operator MUST take action:
| Equipment Type | Trigger Leak Rate |
|---|---|
| Comfort cooling (AC systems for human comfort) | 10% per year |
| Commercial refrigeration (grocery stores, restaurants) | 20% per year |
| Industrial process refrigeration (IPR) | 30% per year |
How Leak Rate Is Calculated
The annualized leak rate is calculated as:
Leak Rate = (Amount of refrigerant added / Total system charge) x 100
The amount is annualized — meaning if you add refrigerant over a period shorter than 12 months, the rate is projected to a full year.
Example: A comfort cooling system holds 100 lbs of R-22. Over a 6-month period, 8 lbs of refrigerant was added. The annualized leak rate is:
- (8 lbs / 100 lbs) x (12/6) x 100 = 16% annually
- Since 16% exceeds the 10% trigger for comfort cooling, repair is REQUIRED
Repair Timelines
Once a leak rate exceeds the trigger, the following timeline applies:
| Action | Deadline |
|---|---|
| Repair the leak | Within 30 days of discovering the leak exceeds the trigger rate |
| Conduct initial verification test | Within 30 days of the repair |
| If repair not feasible in 30 days: Develop retrofit/retirement plan | Within 30 days of determination |
| Complete retrofit or retirement | Within 1 year (or 18 months for IPR with an approved extension) |
Verification Testing
After a leak repair is completed, the owner must verify the repair was successful:
- Initial verification: Conducted within 30 days of repair using one of the approved methods (pressure test, electronic detection, etc.)
- Follow-up verification: If the system uses an ODS refrigerant, a follow-up test is required to confirm the leak has not returned
2026 HFC Leak Repair Rule Changes
Starting January 1, 2026, the new HFC Leak Repair and Management Rule significantly expands leak repair requirements:
Key changes:
- Applies to HFC-containing appliances with 15 pounds or more (down from 50 lbs for ODS)
- Same trigger leak rates apply (10%, 20%, 30%)
- Requires automatic leak detection (ALD) for certain large commercial systems
- Enhanced recordkeeping and reporting requirements
- Mandatory servicing by EPA Section 608 certified technicians
Comparison:
| Requirement | ODS (Before 2026) | HFCs (2026 Rule) |
|---|---|---|
| Charge threshold | 50 lbs or more | 15 lbs or more |
| Trigger rates | 10%/20%/30% | 10%/20%/30% |
| Auto leak detection | Not required | Required for certain large systems |
| Recordkeeping | 3 years | 3 years (enhanced) |
For the Exam: Know the three trigger rates: 10% for comfort cooling, 20% for commercial refrigeration, 30% for IPR. Repairs must be completed within 30 days. The 2026 HFC rule drops the charge threshold from 50 lbs to 15 lbs.
What is the leak rate trigger for comfort cooling equipment containing 50+ lbs of refrigerant?
What is the leak rate trigger for commercial refrigeration equipment?
Under the 2026 HFC leak repair rule, the requirement applies to HFC appliances with how many pounds of refrigerant or more?