The purpose of this document is to summarize the filtration technologies that are available to public water systems that have surface-influenced groundwater sources. Screening to determine questionable sources is performed via questionnaire-type criteria. Infiltration galleries, ranney wells, crib intakes and springs are automatically considered questionable and must undergo monitoring. Wells, however, have selection criteria that consider the aquifer geology and proximity to surface waters. If certain criteria are met, then the well is determined to be questionable and will undergo monitoring.
Monitoring is conducted by the purveyor for a duration of six months.
If particles are present, the groundwater is determined to be under the direct influence of surface water, and will thus be considered a surface water. In accordance with the PA Filter Rule , filtration will be required on all surface water sources.