Few lines on a water report get a household’s attention like a positive bacteria result. It is an unsettling thing to read, and the natural reaction is to want an immediate explanation and an immediate fix. The more useful reaction is narrower: understand what the result reports, find out what confirmation is appropriate, and let the response follow the findings rather than the alarm.
This guide is for private-well households in Chatfield Drilling’s Pennsylvania and Ohio service area. It explains how to read a positive result as information and how to prepare for a professional conversation. It does not interpret a specific report, identify a source of contamination, or tell any household whether its water is safe to use. Those determinations require the actual results, the actual well, and qualified guidance.
A result reports a finding, not a cause
A bacteria test tells you what the laboratory detected in the sample it received. It does not tell you how the organisms got there, whether the source is the well itself, the plumbing, the sampling process, or a condition that has since changed.
That is why a positive result is a starting point for questions rather than a conclusion. The appropriate next step depends on what was detected, what the laboratory recommends, the history of the well, and what an inspection of the system finds. Two households with similar-looking reports can end up with different answers.
Resist the urge to search for a single explanation and act on it. The most common mistake after a positive result is deciding on a cause and a remedy before anyone has looked at the well.
Total coliform and E. coli are not the same finding
Reports often distinguish between total coliform bacteria and E. coli. These are different findings and they are generally treated differently, which is why the distinction on the report matters and why it is worth asking the laboratory or a qualified professional to walk you through it.
Do not treat the two as interchangeable, and do not assume that the presence of one implies the other. Read what the report actually says, note the specific language it uses, and ask what that particular result indicates and what follow-up is recommended.
Penn State Extension’s material on coliform bacteria in private water systems is a reasonable general reference for understanding the terms. It is background reading, not a substitute for guidance on your report.
Ask about interim use before anything else
The most time-sensitive question after a positive result is a practical one: what should the household do with the water right now? That question should go to the laboratory that produced the result, a qualified water professional, or the appropriate local health authority — not to a general article.
Ask directly whether any interim precautions are recommended for drinking, cooking, or other uses, and for how long. Ask whether a confirmation sample is advised before further steps are taken, and how it should be collected. Ask what the recommended follow-up looks like.
Get this guidance early. It shapes everything else, and it is specific to the result and the household rather than to private wells in general.
Record recent events at the property
While confirmation and guidance are pending, write down what has happened recently at the property. This costs nothing and it is genuinely useful to whoever evaluates the system.
Chatfield’s material on bacteria and water sanitation points to conditions worth noting: recent flooding, recent well work, and nearby excavation. Add anything else that changed around the same time — plumbing work, a long power interruption, a period when the property was unoccupied, a new or serviced treatment system, or a change in water use.
Note dates as accurately as you can and describe events plainly. Do not draw a line from any one event to the result. A professional may find a relationship, or may not. The record’s value is that it exists.
Appearance and odor do not confirm or rule out anything
Bacteria are not something a household can see, smell, or taste its way to. Water that looks and tastes normal can return a positive result, and water with an odor or discoloration may have an entirely unrelated explanation such as iron, manganese, sulfur, or sediment.
This cuts both ways. Do not take clear water as reassurance that a positive result was a fluke, and do not take an unrelated aesthetic complaint as evidence of bacteria.
Testing is what establishes the finding. Chatfield’s water sanitation material notes that a laboratory test is the only way to know for certain what is present.
Look at the wellhead — from the outside only
The condition of the wellhead is relevant background, and a brief exterior look is something a property owner can safely do. From a safe distance, note whether the casing appears intact and upright, whether the cap looks present and secure, and whether the ground around the wellhead directs water away from it or toward it.
Do not remove the cap, loosen fittings, reach into the casing, open electrical enclosures, or handle wiring. A well can include energized equipment, and the top of a well is not a place to investigate on your own. Take a dated photo if it helps create a record and leave it there.
Chatfield’s guidance on protecting your water source notes that a wellhead should be sealed with a vermin-proof cap and that a below-grade wellhead is generally recommended to be extended 18 to 24 inches above grade so surface water does not wash in. Whether either applies to a specific well is a question for an inspection, not a self-assessment.
Understand why a one-time disinfection may not settle it
Households often hear that shock chlorination is the answer to a bacteria result. It is a recognized well service, and Chatfield offers it as part of well maintenance — but it should not be treated as a universal cure.
Chatfield’s own material on well cleaning makes the point directly: some well owners view chlorination as a cure-all, and while it might temporarily address taste and odor problems, it can leave behind debris and accumulated organic material. If a condition in the well or the system is allowing bacteria in, a one-time treatment does not change that condition.
This is why the sequence matters. Testing, then inspection, then a recommendation — rather than a treatment applied first and questions asked afterward.
Treatment options follow the findings
If results and inspection indicate that ongoing sanitation is appropriate, there are established approaches, and the right one depends on what was found. Chatfield describes two: a Luminor UV system, which uses ultraviolet light to treat water at the point of entry without adding chemicals or changing taste, and a chlorine injection system with retention, which injects a measured amount of sanitizer and holds the water in a retention tank long enough for contact time — an approach it associates with more severe contamination or water with higher turbidity.
Chatfield’s stated process runs in order: test the water through a certified laboratory, assess the well, plumbing, and installation area, review the results and provide a quote, then install and verify operation.
Notice what comes first in that sequence. Be cautious of any recommendation that arrives before testing and inspection, or that proposes equipment based on a description of symptoms alone.
Plan for retesting and keep the records
Whatever the outcome, a positive result should become part of the well’s permanent record. Keep the original report, any confirmation results, notes on what was inspected or serviced, and the dates of each.
Ask what retesting schedule is appropriate going forward. Chatfield’s guidance on protecting a water source recommends annual inspection and annual testing for common contaminants as ordinary private-well practice, with more frequent testing where circumstances warrant it. A household that has had a positive result may have particular reason to keep up with that routine.
Records also make future conversations faster. A professional looking at a well with three years of results behind it has considerably more to work with than one looking at a single report.
The practical takeaway
A positive coliform result is information that deserves a prompt, orderly response — not a panic and not a guess. Ask the laboratory or a qualified professional about interim precautions and confirmation sampling first. Write down recent events at the property. Look at the wellhead from the outside without touching anything. Understand that a single disinfection may not address an underlying condition, and that treatment recommendations should follow testing and inspection rather than precede them.
Chatfield Drilling can discuss private-well testing and water sanitation with the actual results and system in view. Bring the report, the records, and the questions — that is what turns an alarming line on a lab sheet into a decision the household can make with confidence.
