Well Water Filtration Systems in New Jersey

The most common well water problems in northern New Jersey are not exotic. It is the same handful of findings, over and over, and each one is a different job for a well water filtration system. New Jersey's Private Well Testing Act report on 51,028 wells sampled between September 2002 and April 2007 shows how often each one turned up statewide.

Two more findings never show themselves in a glass of water. New Jersey regulates arsenic more tightly than the federal government does. State rules set a maximum contaminant level of 5 ug/L for arsenic, against the federal 10 ug/L. And every Private Well Testing Act sample in the state is analyzed for gross alpha particle activity using the 48 Hour Rapid Gross Alpha Test, with samples from twelve counties also analyzed for uranium. Union, Essex and Morris are all on that uranium list, along with Bergen, Hudson, Hunterdon, Mercer, Middlesex, Passaic, Somerset, Sussex and Warren. For those two, New Jersey applies the federal limits: 15 picocuries per liter for gross alpha and 30 ug/L for uranium.

Sulfur odor is the exception to the numbers. Penn State Extension notes that most people can detect hydrogen sulfide well below 0.5 mg/L, so the rotten egg complaint usually arrives long before a report looks dramatic. Low pH is the quiet one. It rarely tastes like anything, and the first evidence is often bluish green stains in sinks or small leaks in the plumbing.

A well water filtration system is a sequence, and each stage gets chosen from a number on the report. These are the parts we assemble most often, and the published thresholds that decide between them.

• Iron and manganese filters. Penn State Extension recommends oxidizing filters when the combined iron and manganese concentration is in the range of 3 to 10 mg/L, and says that above 10 mg/L the most effective treatment is oxidation followed by filtration. Air injection filters do the oxidizing with a pocket of air held in the tank, so there is no salt to carry and no chemical to mix.
• Acid neutralizers. A tank of calcite media raises pH as water passes through it. Penn State Extension is direct about the tradeoffs: the media has to be refilled routinely, the process increases the hardness of the water, and the resistance of the media bed can lower water pressure. The added hardness is one reason a softener sometimes follows a neutralizer.
• Ultraviolet disinfection. Systems certified to NSF/ANSI 55 for microbiological water treatment. NSF's certified listings show units carrying either a Class A or a Class B disinfection performance claim, so the class is worth checking on the listing itself before you buy. UV needs clear water. Iron, manganese and sediment absorb and scatter the light, so they are removed ahead of the lamp rather than after it.
• Arsenic media. The certified claims are written for one form of arsenic and for a capped influent level. NSF lists the claim under NSF/ANSI 53 as Arsenic (Pentavalent) less than or equal to 50 ppb Reduction, and under NSF/ANSI 58 as Arsenic (Pentavalent) less than or equal to 300 ppb Reduction. That wording matters. It means the certification covers pentavalent arsenic up to a stated concentration, so the design has to start with what your lab report says rather than with a filter picked off a shelf.
• Softeners on wells. Cation exchange softeners certified to NSF/ANSI 44 carry a hardness reduction claim, and NSF's listings show some units adding certified claims for barium reduction and radium 226/228 reduction. Penn State Extension recommends a softener only when pH is greater than 6.7, hardness is between 3 and 20 grains per gallon, and dissolved iron is less than 5 mg/L. Past that, the resin fouls.

Order is part of the design, and it is what separates a working well water filtration system from a pile of tanks. Sediment first, then oxidizing filtration, then pH correction and softening, with UV last so it treats water that is already clear.

Well water filtration is priced by the stage, so published numbers give you a range and not a quote. One regional supplier lists an iron and sulfur filter at $1,795 to $2,195, an acid neutralizer at $1,195 to $1,895, a UV system at $895 to $995 and a sediment prefilter at $145 to $195, with complete well setups listed between $1,500 and $6,500 and a full five system stack at $6,275 to $7,475. Those are equipment prices from a direct seller and they exclude installation. The same supplier puts a local plumber at $200 to $500 to install one or two systems, which is a useful floor rather than a New Jersey quote.

Three things move the number more than anything else. How many stages your lab report calls for. Tank size, which follows your household's peak flow rather than your square footage. And the condition of the plumbing where the system ties in, since a licensed New Jersey master plumber has to install it with bypass valves and get it inspected.

Ongoing cost is smaller and steadier. The same supplier lists UV lamps at $145 to $160 on a twelve month replacement cycle and quartz sleeves at about $60 to $80 every two to three years, and calcite has to be topped off routinely. You get the whole sequence priced in writing, component by component, and the quote is free.

Well water and the Private Well Testing Act meet at one rule that surprises people. The sample has to be raw. Under N.J.A.C. 7:9E-2.3, where a treatment system is in use on the property, it must be disconnected or otherwise disabled before the sample is collected, or the sample must be collected at a location ahead of it. An existing filter cannot make a report look better than the well is.

The required parameter list is longer than most people expect. It covers total coliform, with E. coli follow-up on a positive, plus nitrate, iron, manganese, pH, lead, arsenic, every volatile organic compound with a state maximum contaminant level, and gross alpha particle activity by the 48 Hour Rapid Gross Alpha Test. The rule added 1,2,3-trichloropropane, ethylene dibromide and 1,2-dibromo-3-chloropropane as of March 3, 2019, and the three PFAS compounds PFNA, PFOA and PFOS as of December 1, 2021. New Jersey's maximum contaminant levels for those three are 0.013 ug/L for PFNA, 0.014 ug/L for PFOA and 0.013 ug/L for PFOS, which the state also states as 13, 14 and 13 parts per trillion.

Two timing rules are worth knowing. Results stay valid for one year for the sale of a property, except coliform, which stays valid for six months. A landlord whose rental is on a private well must test at least once every five years and, within 30 days of receiving the results, give a written copy to each rental unit and each new tenant. The full parameter list, the notification steps and what to do with a failure are covered in our Private Well Testing Act guide and our page on failed well tests. That raw water report is exactly what a well water filtration design should be built from.

Morris County well water is a bigger part of daily life than anywhere else we serve, so well water filtration here is routine work rather than a specialty. In the state's 2002 to 2007 Private Well Testing Act report, 4,645 Morris County wells were sampled, against 80 in Essex County and 33 in Union County. Statewide, the New Jersey Department of Health puts private wells at about 13 percent of New Jersey residents' drinking water.

Those Essex and Union sample counts are too small to read a county rate from, so treat them as a sign of how few wells are left in the built up parts of our service area rather than as a measurement. Morris is the county with enough data to say something. In that period, 2.4 percent of the 4,645 Morris wells were positive for fecal coliform or E. coli and 1.7 percent were above the nitrate limit. Of the 3,104 Morris wells measured against New Jersey's 5 ug/L arsenic standard, 1.8 percent exceeded it.

Within Morris, the municipalities with the most wells in that arsenic sampling were Mount Olive with 397, Chester Township with 382, Washington Township with 368 and Jefferson Township with 336, followed by Roxbury, Rockaway Township, Randolph, Kinnelon, Mendham Township, Montville and Harding.

Read all of it as a picture of the county two decades ago, not a forecast for your well. Wells a quarter mile apart can test differently. The only number that describes your water is the one on your own lab report.