Sole Source Aquifer
The U.S. Environmental Protection Agency (USEPA) defines a sole source
aquifer (SSA) as an aquifer (a soil or rock formation that is capable of storing,
transmitting, and yielding groundwater to wells) “designated by U.S.
Environmental Protection Agency (EPA) as the ‘sole or principal source’ of
drinking water for a given service area, supplying 50% or more of the drinking
water for the area.”
The USEPA designates sole source aquifers into two classes: Class I and
Class II.
• Class I SSA - An aquifer that has high to high-intermediate potential
productivity based on its characteristics and proximity to recharge.
• Class II SSA - An aquifer that has low-intermediate to low potential productivity
based on aquifer characteristics and proximity to recharge.

Following the USEPA’s classification, Going Places classified the Region into
3 areas: Class I SSA designated area; Class II SSA designated area; and
Non-SSA area.
[]
[{'name': 'FID', 'type': 'esriFieldTypeOID', 'alias': 'FID', 'domain': None}, {'name': 'Shape', 'type': 'esriFieldTypeGeometry', 'alias': 'Shape', 'domain': None}, {'name': 'SSA_Class', 'type': 'esriFieldTypeString', 'alias': 'SSA_Class', 'length': 15, 'domain': None}, {'name': 'Measures', 'type': 'esriFieldTypeString', 'alias': 'Measures', 'length': 30, 'domain': None}, {'name': 'Score', 'type': 'esriFieldTypeSmallInteger', 'alias': 'Score', 'domain': None}]
nan
nan
{'renderer': {'type': 'uniqueValue', 'field1': 'SSA_Class', 'field2': None, 'field3': None, 'fieldDelimiter': ', ', 'defaultSymbol': None, 'defaultLabel': None, 'uniqueValueInfos': [{'symbol': {'type': 'esriSFS', 'style': 'esriSFSSolid', 'color': [169, 0, 230, 255], 'outline': {'type': 'esriSLS', 'style': 'esriSLSSolid', 'color': [0, 0, 0, 0], 'width': 0.4}}, 'value': 'Class 1 SSA', 'label': 'Class 1', 'description': ''}, {'symbol': {'type': 'esriSFS', 'style': 'esriSFSSolid', 'color': [232, 190, 255, 255], 'outline': {'type': 'esriSLS', 'style': 'esriSLSSolid', 'color': [0, 0, 0, 0], 'width': 0.4}}, 'value': 'Class 2 SSA', 'label': 'Class 2', 'description': ''}]}, 'transparency': 0, 'labelingInfo': None}
nan
nan