Work sheet 3
Assessment 1
Well location
Use this assessment to rate your well location risks. For each question, indicate your risk level in the right-hand column. Although some choices may not correspond exactly to your situation, choose the response that best fits. Refer to Part 1 of Fact Sheet 3 if you need more information to complete the table.
Well location
| Low risk | Medium risk | High risk | Your risk | |
|---|---|---|---|---|
| Position of well in relation to pollution sources | Well is uphill from all pollution sources. Surface water doesn't reach well or is diverted. Casing extends above ground surface. | Well is level with or uphill from most pollution sources. Some surface water runoff may reach well. | Well is downhill from pollution sources or in a pit or depression. Surface water runoff reaches well. Top of well casing is level with or below ground surface. | Low Medium High |
| Separation distances between well and pollution sources | Distances from potential pollution sources meet or exceed all state minimum requirements. | Some but not all distances from potential pollution sources meet state requirements. | Distances from most or all potential pollution sources do not meet state minimum requirements. | Low Medium High |
| Soil type | Soil is fine-textured like clay loams or silty clay. | Soil is medium-textured like silt or loam. | Soil is coarse-textured like sand, sandy loam or gravel. | Low Medium High |
| Subsurface conditions | The water table or fractured bedrock are deeper than 20 feet. | The water table or fractured bedrock are shallower than 10 feet. | Low Medium High |
Assessment 2
Well construction and maintenance
Use the table below to rate your risks related to well construction and maintenance. For each question, indicate your risk level in the right-hand column. Although some choices may not correspond exactly to your situation, choose the response that best fits. Refer to Part 2 in Fact Sheet 3 if you need more information.
Well construction and maintenance
| Low risk | Medium risk | High risk | Your risk | |
|---|---|---|---|---|
| Well age* | Well was constructed after 1987. | Well was constructed before 1987, but is not 50 years old. | Well is more than 50 years old. | Low Medium High |
| Well type | Drilled well. | Driven-point (sand-point) well. | Dug well. | Low Medium High |
| Casing height above land surface | Casing is 12 inches or more above the surface. If the area floods, casing is 1 to 2 feet above the highest recorded flood level. | Casing is at the surface or up to 12 inches above the surface. | Casing is below the surface or in a pit or basement. | Low Medium High |
| Condition of casing and well cap (seal) | No holes or cracks are visible. Cap is tightly attached. A screened vent faces the ground. | No holes or cracks are visible. Cap is loose. | Holes or cracks are visible. Cap is loose or missing. Running water can be heard or seen. | Low Medium High |
| Casing depth relative to land surface | Casing extends 50 feet or more below the land surface. | Casing extends 20 to 50 feet below the land surface. | Casing extends less than 20 feet below the land surface. | Low Medium High |
| Backflow protection | Measures are taken to prevent backflow and, where necessary, anti-backflow devices are installed. | Measures are sometimes taken to prevent backflow. No anti-backflow devices are installed. | No measures are taken to prevent backflow. No anti-backflow devices are installed. | Low Medium High |
| Well inspection and tune-up | Well was inspected within the last 10 to 15 years. | Well was inspected 15 to 20 years ago. | Well was inspected over 20 years ago or don't know when well was last inspected. | Low Medium High |
*Wells drilled after 1987 are subject to standards that were not in effect prior to that date.
Assessment 3
Water testing and unused wells
Use the table below to rate your risks related to water quality and unused wells. For each question, indicate your risk level in the right-hand column. Although some choices may not correspond exactly to your situation, choose the response that best fits. Refer to Part 3 in Fact Sheet 3 if you need more information.
Water testing and unused wells
| Low risk | Medium risk | High risk | Your risk | |
|---|---|---|---|---|
| Water testing | Consistent, good water quality. Tests meet standards for bacteria, nitrate, and other contaminants. | Some tests do not meet standards or tests approach standards. | Water is not tested. Water is discolored after a rainstorm or during spring melt. There are noticeable changes in color, odor, and taste. | Low Medium High |
| Unused wells on your property or in your area | There are no unused wells, or there are unused wells that are properly sealed. | There are unused wells that are not sealed but are capped and isolated from contaminants. | There are unused, unsealed wells that are in poor condition, near pollution sources, and/or uncapped. | Low Medium High |
Action checklist
When you finish the work sheets, go back over the questions to ensure that every high and medium risk you identified is recorded in the work sheets. For each risk, write down the improvements you plan to make. Use recommendations from this guide and from resources elsewhere. Pick a target date that will keep you on schedule for making the changes. You don't have to do everything at once, but try to eliminate the most serious risks as soon as you can. Often it helps to start with inexpensive actions.
Drinking water well management
| Write all high and medium risks below. | What can you do to reduce the risk? | Set a target date for action. |
|---|---|---|
| Sample: Water hasn't been tested for 10 years. Smells different than it used to. | Have sample tested at county or state health department or a private testing lab. | One week from today: April 8 |