The presence of coliform bacteria indicates that a well water supply may contain other microorganisms that can cause negative health effects. Coliform bacteria can enter a water supply from several sources including:
- Unsanitary well construction techniques
- Well flooding
- Changes in plumbing
- Poor sampling technique
- Failure of well drilling contractor to properly develop and or disinfect upon completion
- A contaminated aquifer system
In most cases, coliform bacteria problems can be managed through well disinfection with chlorine. If a well is newly constructed, it is the responsibility of the well drilling contractor to disinfect the well and ensure that a safe bacteriological sample is received.
Other water quality complaints range from aesthetic (taste and/or odor) preferences to health-related problems. Some water quality problems are a result of plumbing issues, such as dead-end water lines, while other water quality problems are a result of naturally-occurring substances in the groundwater, such as hydrogen sulfide, chloride, or iron. Still other water quality concerns may exist as a result of manmade contamination.
The LHDs are a great resource to help well owners resolve water quality issues. LHDs often have information concerning groundwater quality of a given area and can assist well owners on determining what their water should be sampled for, the best sampling locations, costs for such testing, and the methods to have the sampling completed.
It is important to determine if the concern is caused by the groundwater conditions, the water system construction, and/or by the distribution system piping. After the contaminant is identified, LHDs will assist well owners in determining a course of action. This action is typically based on a determination of whether the water quality problem poses a significant health risk and/or poses little or no health risk but rather is an aesthetic concern. For example, an unusual odor in the drinking water could be caused by harmless groundwater bacteria, or it could be caused by a groundwater contaminant that is known to cause health effects.
In some cases, a water quality problem may be resolved through water treatment. Water treatment is best used to improve the aesthetic quality of the water. Caution is to be taken when utilizing water treatment devices to remove a contaminant that is associated with health effects. These devices work only as well as they are maintained and may give a false sense of security if not operating properly. Frequent water testing is recommended when using a water treatment device. Many LHDs will not accept the use of a water treatment device to address unacceptable water quality, especially for contaminants that may be associated with a health conditions such as elevated nitrate levels.