Government sampling of groundwater wells in Kent County, Delaware, focusing on aquifer 125RCCS, shows hardness levels typically ranging from 50.1 to 154.0 mg/L, with a median hardness of 134.0 mg/L. These samples were collected from 12 wells at depths between 180 and 380 feet during July and August 2015, and no federal hardness thresholds were exceeded.

Distinguishing Hard Water from Other Water Quality Issues

Hardness versus Iron or Sediment

• Hard water is characterized primarily by dissolved calcium and magnesium minerals; it does not cause discoloration or particulate matter like iron or sediment.
• Unlike sediment, hardness minerals remain dissolved and do not cloud water or settle out.
• Hard water does not produce metallic tastes or staining typical of iron presence.

Sampling Scope and Interpretation

Number of Wells and Sample Size

• Data is based on 12 discrete wells sampled once each within a six-week period in mid-2015.
• The limited sample size reflects regional trends but does not account for all potential site-specific variation.
• One well measured hardness below the reporting limit, indicating some variability within the aquifer.

Hardness Origins in Kent County Groundwater

Source of Hardness Minerals

• Calcium and magnesium hardness originates naturally from the limestone and dolomite formations composing aquifer 125RCCS.
• Water percolating through these geologic layers dissolves hardness minerals, leading to measurable levels in groundwater.
• Depths of wells sampled (180 to 380 feet) reflect groundwater that has undergone mineral contact over extended flow paths.

Initial Effects on Commercial Water Use

Fixtures and Processes Most Sensitive to Hardness

• Water-using equipment such as boilers, heat exchangers, and laundry systems may experience scale buildup from hardness minerals first.
• Commercial dishwashers and cooling towers are also prone to mineral deposits impacting efficiency.
• Fixtures in continuous-use processes where water hardness accumulates can see reduced lifespan and increased maintenance without treatment.

Comparing Kent County Hardness Records Regionally

Contextualizing by Neighboring Areas

• When comparing to adjacent counties, note that hardness levels can vary substantially due to differing aquifer geologies.
• Regional averages provide a baseline but do not predict hardness in every well or commercial site.
• Use localized water testing to avoid assuming uniform treatment needs based solely on neighboring county data.

Recommended Water Testing to Confirm Onsite Conditions

Essential Hardness Testing for Commercial Facilities

• Order a certified hardness test of your facility's water supply specific to your well or source.
• This test quantifies calcium and magnesium concentrations responsible for hardness and establishes your exact treatment needs.
• Results will guide the selection and sizing of equipment like the Nelsen 1,950,000 Grain Commercial Water Softener, which ships ready to configure for commercial demands.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2015-08-20. 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 Hardness, Ca, Mg in the 125RCCS aquifer (Kent County): 12 results from 12 wells, median 134.0 mg/L, range 50.1-154.0 mg/L; none above any federal threshold