108-18-3 Establishment Of Drinking Water Source Protection Zones

There are hereby established use districts to be known as Zones One, Two, Three, and Four, of the drinking water source protection area, or alternatively the management area. These zones shall have the approval of the state division of drinking water as described in R309-600 Source Protection: Drinking Water Source Protection for Ground-Water Sources and are identified and described as follows: Zone One is the area within a 100-foot radius from the wellhead or margin of the collection area. Zone Two is the area within a 250-day groundwater time of travel to the wellhead or margin of the collection area, the boundary of the aquifer which supplies water to the groundwater source, or the groundwater divide, whichever is closer. Zone Three is the area within a three-year groundwater time of travel to the wellhead or margin of the collection area, the boundary of the aquifer which supplies water to the groundwater source, or the groundwater divide, whichever is closer. Zone Four is the area within a 15-year groundwater time of travel to the wellhead or margin of the collection area, the boundary of the aquifer which supplies water to the groundwater source, or the groundwater divide, whichever is closer. Management area means the area outside of Zone One and within a two-mile radius where the optional two-mile radius delineation procedure has been used to identify a protection area, as described in the state division of drinking water R309-600 Source Protection: Drinking Water Source Protection for Ground-Water Sources. This area shall be treated as for Zone Two. In some cases, such as bedrock areas, Zones Two, Three, and Four are overlapping due to the inability to determine time of travel. These are sensitive areas. In these cases, the zone should be protected as for Zone Two.