What is the minimum passing grade on the Class I installer exam?

The minimum passing grade on the Class I installer exam is set at 70%. This standard is established to ensure that individuals who are certified as installers possess a sufficient understanding of the necessary knowledge and skills required for effectively managing and installing septic systems. A passing score of 70% reflects a reasonable mastery of the subject matter, indicating that the installer is equipped to handle the responsibilities of the job safely and competently.

Setting the passing threshold at this level helps maintain a baseline of competence among installers, which is crucial for protecting public health and the environment. Lower thresholds might lead to individuals possessing inadequate knowledge being certified, potentially resulting in improper installations that could cause system failures or environmental contamination. Thus, the decision to require a minimum of 70% serves to uphold standards within the industry.