Pretreatment Year

  • The Pretreatment Year is 15 months long and begins in October of the previous calendar year.

  • The Pretreatment Year is divided into four evaluation periods.

  • The evaluation periods are six months long and overlap each other. The beginning of an evaluation period starts midway through the previous period. For example, the first evaluation period begins in October of the previous calendar year and continues until March of the current calendar year. The second evaluation would start in January of the current calendar year and continue until June of the current calendar year, as indicated in the graphic below.

  • At the end of each evaluation period, the NBC evaluates data for SNC Criteria A and Criteria B for its industrial users (IU) for that period. If an IU is found to be in SNC during that evaluation period, then the IU is in SNC for the year and will be published in the Providence Journal at the end of the Pretreatment Year as a significant violator. All other SNC criteria is evaluated for an IU at the end of the Pretreatment Year to determine if the IU should be published as a significant violator.

Pretreatment Year