Source Water Type categorizes the primary source water used by a water system. Permitted entries include the following: Primary Source categorizes the primary water source for the public water system. The source of water determines treatment requirements, or other standards. For example, the presence of any surface water sources in a public water system s inventory forces a surface water (SW) classification, even though more groundwater may be supplied than surface water. Any groundwater under the influence of surface water sources in a water system inventory necessitates a Ground Water Under the Influence of Surface Water (GUISW) classification. These higher classifications dictate higher monitoring requirements for the water system and greater public health protection.
GU - Groundwater UDI Surface Water – System has a source that provides water under the direct influence of surface water (e.g., unprotected well or springs) and no surface water sources.
GUP - Purchased Groundwater UDI Surface Water – System purchases water that originates from source that provides water under the direct influence of surface water (e.g., unprotected well or springs) and no surface water sources.
GW - Groundwater – System has a groundwater source that is not under the direct influence of surface water (e.g., protected wells) and no surface water or groundwater under the influence of surface water sources.
GWP - Purchased Groundwater – System purchases water that originates from groundwater source that is not under the direct influence of surface water (e.g., protected wells) and no surface water or groundwater under the influence of surface water sources.
SW - Surface Water – System has a surface source (e.g., river, reservoir, intake).
SWP - Purchased Surface Water – System purchases water that originates from a surface source (e.g., river, reservoir, intake).