Classification of main source water type of drinking water plants
1 - Primarily surface water
'Primarily surface water' includes plants treating 90% or more surface water (water from sources open to the atmosphere such as rivers, lakes and reservoirs).
2 - Primarily groundwater and groundwater under the direct influence of surface water (GUDI)
'Primarily groundwater and groundwater under the direct influence of surface water' includes plants treating 90% or more groundwater (water found in underground aquifers which supplies wells and springs) or groundwater under the direct influence of surface water (GUDI: groundwater supply sources under conditions where microbial pathogens are able to travel from surface water to the groundwater source).
3 - All other source water combinations
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