Well Water Treatment on the
Delmarva Peninsula From
Sharp Water Culligan

A pH test tells you in a minute, and it is one of the first things we read. Below about 6.5 the water is aggressive toward metal plumbing. The signs show up before the test does: blue-green staining in a sink or tub, a metallic taste, or copper lines that develop pinhole leaks after a few years. If you have seen any of those, pH is the first thing to check.

Because of what it moves through. The sands under the Eastern Shore and Delaware are quartz-rich and hold very little carbonate, so there is nothing to neutralize the natural acidity rainwater picks up as it infiltrates. Water in limestone country comes out hard and alkaline for the opposite reason. Here it comes out soft and acidic.

No, and this is the most common mistake we see. A softener exchanges calcium and magnesium for sodium. It does not raise pH and it will not stop your water from dissolving copper. Acidic water needs a neutralizing filter, which is a separate piece of equipment that adds alkalinity back before the water reaches your plumbing.

From your own pipes. Acidic, low-alkalinity water dissolves a little copper from the lines as it sits overnight, and that dissolved copper leaves the blue-green mark when the water evaporates in a sink or tub. The same process can pull lead out of older solder joints and brass fittings. A first-draw sample in the morning is the one that shows it.

It depends on how deep your well is and what is around it. In a Delaware Geological Survey study of 209 shallow domestic and small-supply wells, 18 percent were over the federal limit, and shallow wells in farm country are where that risk sits. Nitrate has no taste, color or smell, so the only way to know is a test. It matters most for pregnant women and infants under six months.

Yes, at least once. Groundwater moves, and the shallow aquifer under much of Delmarva is recharged across a wide area rather than straight down from the field next door. Septic systems are a second source that has nothing to do with agriculture. One test settles it, and if your number is low you are unlikely to need to think about it again for years.

It does the opposite. Boiling evaporates water and leaves the nitrate behind, so the concentration goes up. Nitrate comes out with reverse osmosis at the tap or anion exchange for the whole house. Nothing you do on the stove helps.

It is. DNREC and the Division of Public Health offer free testing to Delaware private well owners for PFAS and a range of other contaminants, with no charge for sampling or lab work, and the state says it will contact you within about two weeks of your request to schedule. If PFAS is found, the state may cover filtration and maintenance for a year. It is a good program and worth using. There is more about it here.

No. The free testing is a Delaware program for Delaware residents. If you are in Salisbury, Cambridge, Easton, Elkton, Princess Anne or St. Michaels, it does not cover you. Our in-home water test is free either way, and it covers the treatment-relevant numbers the state programs do not look at.

It is real and it is specific. DNREC reports PFAS was detected in groundwater on the base in 2014, and that in 2019 four private wells nearby, serving five businesses, two homes and one office building, exceeded the federal advisory then in effect. The Air Force provided bottled water and later installed filtration. That is a defined set of properties rather than a region-wide problem, and a test is how you find out which side of it you are on.

Under the Maryland Private Well Safety Act of 2023, which took effect October 1, 2024, a contract for the sale of property with a private well has to include a provision requiring water quality testing. The minimum analytes are bacteria, nitrate and turbidity, the work has to be done by a state-approved sampler and lab, and results stay valid for three years. Rental properties have to be tested every three years with the results disclosed to tenants. The state may add more analytes by the end of 2026.

No. Delaware requires a construction permit, a licensed contractor and disinfection of the finished well. Its regulations reserve the bacteriological sample for public wells. Its regulations require the finished well to be disinfected and reserve the follow-up bacteriological sample for public wells. A domestic well, which the state defines as one serving no more than three dwellings, has no required water quality test attached to it.

Once a year for bacteria and nitrate is the common recommendation, and those are the two that can change without warning. pH, alkalinity, iron, hardness and manganese change slowly, so every few years is reasonable unless something about the water changes. Retest any time the taste, smell or color shifts, or after work is done on the well.

Hydrogen sulfide gas, produced by bacteria that reduce sulfate in oxygen-poor groundwater. Neither Maryland nor Delaware publishes a figure for how many private wells have it, so we will not pretend to know how common it is here. What we can say is that the strength of the smell is not a reliable guide to how much is present, and that a water heater can produce the same odor for an unrelated reason, which a test tells apart.

Almost always. Iron is the most widespread constituent above its secondary standard across this aquifer system, and Salisbury runs a dedicated iron removal step on its own municipal wells for exactly this reason. Manganese causes a darker brown or black version of the same problem. The two are treated differently, so it is worth knowing which one you have.

Less often than people assume. Coastal Plain groundwater is naturally low in calcium and magnesium, which is the same chemistry that makes it acidic. Some wells here are genuinely hard and some are very soft, and there is no published average for private wells on Delmarva that we would stand behind. That makes a hardness reading worth taking rather than guessing at.

Not much, and in Dover it tells you less than you would think. Dover is entirely on groundwater, and six of its twenty-one wells sit in the same unconfined aquifer that shallow domestic wells tap. The difference is not the source. It is that the city treats, tests and reports on its water continuously and nobody does that for yours.

The Maryland Geological Survey notes that radium can be elevated in the Eastern Shore surficial aquifer, because the same low pH that makes this water corrosive also helps release radium from quartz sands. That is a mechanism, not a measurement, and no agency publishes a prevalence figure for private wells here. We are not going to tell you it is likely or unlikely. If it concerns you, it is a specific lab test and worth running once.

We could not find a study of arsenic in Maryland or Delaware Coastal Plain domestic wells that would let us say anything honest about how common it is here. It has been detected in one of the deeper regional aquifers in public-supply monitoring. If you want to know about your well, it is a test, and we would rather say that than quote you a number from somewhere else.

DNREC identifies this as a real issue for Delaware well owners, noting that homeowners with wells near saltwater bodies may notice a salty taste in the hotter, drier months when the water table is at its lowest. The state also makes a point worth repeating: saltwater cannot be removed by the typical water softener. Reverse osmosis is the household answer, and a chloride test confirms what you are dealing with.

With a test, because every recommendation after that depends on it. The test is free, it happens at your house, it takes about half an hour, and you get your numbers explained in plain language. If your water does not need treatment we will tell you that.