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Information of use to those who serve private well owners.

New NHDES Online Tool Helps Well Owners Understand Their Water Sample Results

The New Hampshire Department of Environmental Services (NHDES) has developed a new free tool, the Be Well Informed Guide, for interpreting private well water testing results. Although the tool was developed for residents of New Hampshire, it's available to anyone. The tool provides an evaluation of water samples, identifying results that are over the USEPA maximum contaminal level (MCL), and can also recommend possible treatment options based on the sample results provided. The Be Well Informed Guide evaluates the pollutants that are part of the “Standard Analysis,” which is the group of commonly found pollutants is listed in the NHDES Private Well Brochure.

How the Tool Works

With water testing results in hand, all you need to do is go to the site and enter results from a laboratory report. You will then receive an evaluation of well water quality and, if necessary, possible water treatment options.



We entered an arsenic result of 15ppb (the USEPA MCL is 10ppb) in the example below. The tool allows you to use common units, so it’s much less likely a well owner will put in the incorrect units from their lab report.


We didn’t put in any other results, just arsenic, and when we hit “Submit”, got the following screen:



This illustrates that the tool is quite robust. Often the appropriate treatment options for a single contaminant, like arsenic, can depend on the overall chemistry of the water. Here the tool asks for more information to give you the best suggestion. We hit “continue”, and went on to the results shown below.





Based on your results, the tool will tell you if the value you entered meets, exceeds, or is close to the (federal) drinking water limit for public water supplies. Along with a detailed interpretation of your results, the tool will also identify health concerns and offer potential treatment options.

Access the Be Well Informed Guide.

Be sure to read all of the information related to use of the site. Also, please remember that The Private Well Class recommends using tools like this for an initial understanding of your test results. You should always take your results to a qualified health professional, such as your county or state health department, for the best advice.

FAQ: "Shock Chlorination Didn't Work"

Question

I have shock chlorinated my well several times, but my sample results still come back positive for bacteria. What can I do?

Answer

Reoccurring bacteria problems mean there is a source of bacteria somehow connected to your well at the surface. It could be that your well is in a vulnerable geologic setting, meaning the groundwater itself is being contaminated from the surface and getting into your well. The other likelihood is that your well has a breach or was poorly constructed and allows near surface water into your well.  If your well is shallow, then the water coming into your well is from near the surface and more likely to be contaminated if there is a source nearby (usually livestock or septic). If so, this will always be an issue for your well. As an example, in New York there are many areas where a commonly used bedrock aquifer is at or near the surface, and because of this many shallow wells in this aquifer setting are vulnerable to surface contamination. Another vulnerable geologic setting is in karst areas, where you find caves, caverns, and sinkholes, all of which are conduits for surface contamination.

If you have a dug or bored well, they are made to allow water to seep into the well bore from the surrounding area over most of the depth of the well. They are typically more susceptible to surface contamination because of where water is getting into the well. If you have a deeper well, with casing to a considerable depth, it could also be that the well wasn’t properly constructed, maybe it wasn’t grouted properly so water can run down along the outside of the casing, or there are holes in the casing allowing water into the well from near the surface.

There are really only two solutions to this issue, properly construct a well into an aquifer that is not influenced by the surface (so in the NY example, it would have to be a different, deeper aquifer if one exists), or add continuous treatment to treat for the bacteria. The most common treatment is either a continuous chlorination or ultraviolet disinfection. If you are considering either of these alternatives, contact your health department for advice. Both have maintenance needs and you should understand the responsibilities of adding treatment.