Interpreting 'Detected', 'Median', and 'Range' in FIPS 180 Iron Sampling
The U.S. Geological Survey sampled groundwater from wells 3 to 7 feet deep in FIPS 180, Connecticut, within aquifer N100GLCIAL. Iron was detected in all three samples from two wells, with results ranging from 314 to 7,350 micrograms per liter (ug/L) and a median concentration of 2,120 ug/L. 'Detected' means iron was measured by instruments above the reporting threshold, while 'median' is the middle value of the samples, and 'range' reflects the lowest to highest measured concentrations. These numbers describe regional groundwater characteristics, not the specific water at any household.
What the Measured Iron Range Indicates Against Federal Standards—and What It Does Not
The iron concentrations found in the sampled wells are below federal health-based thresholds, indicating no violation or safety concern as defined by regulatory agencies. However, iron presence at these levels may affect water appearance and taste, which are governed by secondary standards related to aesthetics rather than health. The detected iron should be understood as a typical range within the aquifer, not a direct measure of an individual home's water quality or safety.
Maintenance Rhythm for the Fleck Iron + Hard Water System
The Fleck Iron + Hard Water system, designed for treating iron and hardness at home, has a grain capacity of 32,000 and ships ready to configure. Routine upkeep typically involves regenerating the media that captures iron and hardness minerals within the system’s treatment bed. Homeowners can expect periodic replenishment cycles based on their water usage and iron/hardness load, which ensures consistent performance without extensive manual intervention.
Worked Example: Applying the Median and Range for Treatment Sizing
Using the median iron level of 2,120 ug/L as a planning reference provides a balanced basis for sizing water treatment equipment. Considering the range up to 7,350 ug/L helps accommodate potential fluctuations in iron concentration. For a household drawing water from this aquifer, the Fleck system’s 32,000 grain capacity addresses typical iron and hardness conditions effectively, assuming household water use aligns with average residential consumption.
Differences Between Public System Records and Private Well Testing
Public water system records and area aquifer data offer an overview of regional water quality but do not replace testing of a private well. While the government’s samples establish general trends in iron presence across wells in FIPS 180, individual private wells can vary significantly in iron concentration and hardness. Certified laboratory testing of a home's water supply remains essential to determine specific treatment needs accurately.
Long-Term Effects of Untreated Iron and Hardness
If iron and hardness are left untreated over many years, water fixtures and appliances may develop reddish or brown staining. Hardness minerals can cause scale buildup inside pipes, reducing flow efficiency and increasing energy use in water heaters. These effects, while not health hazards, can increase maintenance costs and affect water's aesthetic quality.
Important: The government data on iron levels in the aquifer indicate what has been measured regionally but do not specify the water quality in any individual home. Homeowners should not assume their water matches these exact figures without a recent, certified laboratory test.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2011-06-29. 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 Iron in the N100GLCIAL aquifer (FIPS 180): 3 results from 2 wells, median 2120.0 ug/L, range 314.0-7350.0 ug/L; none above any federal threshold