Location | ||||
Position of drinking water well in relation to pollution sources. | Upslope from all pollution sources. No surface water runoff reaches well. Surface water diverted from well. | Upslope from or at grade with pollution sources. No surface water runoff reaches well. | Downslope from most pollution sources. Some surface water runoff may reach well. | Settling or depression near casing. Surface water runoff from livestock yard, pesticide and fertilizer mixing area, fuel storage or farm dump reaches well. |
Separation distances between well and farmstead con - tamination sources. | Meets or exceeds all state minimum required separation distances. | Meets most minimum separation distances. | Meets minimum separation distances only for sources required to be at least 100 feet from well. | Does not meet all minimum separation distances for sources required to be at least 100 feet from well. |
Soil and/or subsurface potential to protect groundwater | fine - textured soils (clay loams, silty clay). Water table or fractured bedrock deeper than 20 feet. | Medium - textured soils (silt loam, loam). Water table or fractured bedrock deeper than 20 feet. | Medium- or coarse - textured soils. Water table or fractured bedrock deeper than 20 feet. | Coarse - textured soils (sands, sandy loam). Water table or fractured bedrock shallower than 20 feet. |
Condition | ||||
Condition of casing and well cap (seal) | No holes or crack. Cap tightly secured. Screened vent. | No defects visible. Well vented but not screened. | No holes or cracks visible. Cap loose. | Holes or cracks visible. Cap loose or missing. Can hear water running. |
Casing depth | Cased more than 100 feet below water level in your well. | Cased 31 - 100 feet below water in your well. | Cased 10 - 30 feet below water level in your well. | Cased less than 10 feet below water level in your well. No casing. |
Casing height above land surface | More than 12 inches above grade.
| 8 - 12 inches above grade. | At grade or up to 8 inches above. | Below grade or in pit or basement. |
Well Age | Less than 20 years old. | 21 - 50 years old. | 51 - 70 years old. | More than 70 years old. |
Well type | Drilled | Driven - point (sand point) | Dug well | |
Management | ||||
Backflow prevention | Anti - backflow devices (such as check valves) installed on all faucets with hose con - nections. No cross - con - nections between water supplies. | Anti - backflow devices installed on some faucets with hose con - nections. | No anti - backflow devices. Air gap main - tained. | No anti - backflow devices. Air gap not main - tained. Cross - con - nections between water supplies. |
Unused well | No unused, unsealed wells. | Unused wells capped and protected. | Unused, unsealed well in field. Not capped or protected. | Unused, unsealed well in farmstead. Not capped or protected. |
Water testing | Consistent satisfactory water quality. Bacteria, nitrate and other tests meet standards. | Occasional deviation from standards with bacteria, nitrate and other tests. | Bacteria, nitrate and other tests mostly do not meet standards. | No water tests done. Water discolored after rainstorms or during spring melt. Noticeable changes in color, clarity, odor or taste. |
July 16, 1998
Dennis Hoffman, Project Leader
Steve Dagitz, Webmaster