EPA advises inspection of the average household septic system at least every three years by a septic service professional.
Applicability, timing, evidence, and source
Applicability
U.S. household property owners using the described private system.
Audience: household property owner
System types: average household septic system
Supporting evidence
The average household septic system should be inspected at least every three years by a septic service professional.
Official source
- U.S. Environmental Protection Agency · How to Care for Your Septic System Official government