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Water Origin and Distribution in Cape May County Aquifer 121CNSY

The groundwater supplying many households in Cape May County is drawn from aquifer 121CNSY, a deep geological formation reached by wells between 190 and 395 feet. Water from this aquifer travels through underground rock and soil before arriving at residential taps, carrying with it naturally occurring minerals including trace amounts of arsenic as sampled in government studies.

Distinguishing Aesthetic Secondary Standards from Health-Based Limits for Arsenic

Secondary standards relate to water taste and appearance, not official health safety for arsenic.

Arsenic is regulated by federal health-based standards to limit potential health effects. While aesthetic secondary standards exist for other constituents, arsenic limits focus strictly on health. The government record for Cape May County’s aquifer shows detected arsenic well below any federal health thresholds.

A detection means the instrument has measured arsenic, but this does not indicate a health violation or unsafe water.

Sampling in the area found arsenic present in some well tests, but always below regulated limits. Detection alone should not be confused with a health concern.

Household Signs Related and Unrelated to Arsenic Presence

Visible staining or unusual taste may have causes other than arsenic.

Arsenic typically does not cause taste or odor changes detectable by household members. Water discoloration or metallic tastes often stem from other minerals or system conditions and are not reliable indicators of arsenic presence.

Testing is required to determine if arsenic is present in your specific water supply.

Since arsenic is colorless and tasteless, only proper water testing can reveal its levels in your household supply.

Sources of Arsenic in Cape May County Groundwater

Arsenic in this region primarily originates from natural geological formations.

Mineral deposits in the Cape May County aquifer release trace arsenic into groundwater over time. Human activities have not significantly contributed to arsenic levels in this area’s deep wells.

Interpreting Measured Arsenic Ranges Against Federal Standards

Government samples from 21 wells showed arsenic concentrations from 0.03 to 0.87 micrograms per liter, median 0.28.

These numbers represent an extensive area sample, not any individual household’s water. Importantly, all recorded concentrations were below federal maximum contaminant levels, meaning they fall within accepted health safety standards.

Results below or near detection limits do not suggest absence but very low levels of arsenic.

Many wells showed arsenic below reporting limits, which means arsenic was not measurable at those sampling times.

Seasonal and Multi-Year Trends in Arsenic Levels from 2010 to 2026

Sampling over sixteen years shows consistent low arsenic presence with little variation.

Data collected between May 2010 and June 2026 indicates that arsenic concentrations in the aquifer have remained stable without periodic spikes or trends that would suggest increasing contamination or seasonal effects.

Summary and Next Steps

This overview reflects government-monitored arsenic levels from 21 wells in Cape May County’s aquifer 121CNSY, spanning extensive sampling depth and dates. While arsenic appears in some samples at very low levels, none exceeded federal safety standards. To determine your household’s water quality, specific testing is necessary. For households seeking to address arsenic concerns, the Pentair Arsenic Filter ships ready to configure and provides a documented solution for reducing arsenic in residential water supplies.

Refer to the U.S. Geological Survey groundwater sampling data for complete details on arsenic measurements in Cape May County aquifer 121CNSY.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2026-06-03. These figures describe groundwater sampled in this area. They are not a test of any individual private well - only a test of that well can establish its own water.

On record: U.S. Geological Survey sampling of Arsenic in the 121CNSY aquifer (Cape May County): 40 results from 21 wells, median 0.28 ug/L, range 0.03-0.87 ug/L; none above any federal threshold