The Connecticut Public Health Code establishes the design and installation standards for individual septic systems. It is not unusual, especially for repairs on older or smaller lots, that code variances are necessary to provide an effective, well functioning septic system.

Variances granted by the local Director of Health are usually arranged between the licensed septic system installer and the Health Department and are based primarily on individual site conditions.

Variance from the separating distance to wells, or the requirement that each building be served by a separate septic system can only be granted after appeal to the Connecticut Department of Public Health. Variances are not allowed for new homes on new lots.