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Statutory Compliance

EPA Subpart C Leak Rate Calculator

Calculate system leak rates dynamically using the EPA annualized method. Under the AIM Act (40 CFR Part 84 Subpart C), the mandatory tracking threshold dropped from 50 lbs to 15 lbs on January 1, 2026.

Annualized leak rate calculations determine if a commercial refrigeration, comfort cooling, or industrial process system is leaking beyond statutory compliance limits.

Annualized Leak Rate Formula

Leak Rate % = (Lbs Added / Full Charge) * (365 / Days Since Last Addition) * 100
2026 EPA Compliance Rule Highlights:
  • 15 lb Threshold: Monitoring is required for all systems containing 15 lbs or more of HFC charge capacity.
  • Leak rate thresholds: 20% for Comfort Cooling, 30% for Commercial Refrigeration, and 30% for IPR.
  • Violation penalties: Failing to perform repairs within 30 days of exceeding thresholds can trigger statutory fines up to $69,733 per day, per violation.

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