Government groundwater samples taken from 31 wells between 2011 and 2021 in Lafayette Parish’s aquifer 112CHCTU show hardness present in every test, with a median concentration of 106.5 mg/L and a range from 26.3 to 368.0 mg/L.
Belief: Public water system data can directly tell me my well’s water hardness and rust levels
What the record shows is that samples represent area-wide groundwater but do not pinpoint any single well’s water quality. Public or regional data covers many wells 11 to 250 feet deep, but your individual well can differ depending on local geology and depth. A private well test is necessary for exact hardness and rust indications in your household water.
Belief: Well rust and hardness affect all fixtures and appliances equally and immediately
What the record shows is that hardness, linked to calcium and magnesium in water, often first impacts surfaces with continuous water exposure or restricted flow, such as water heaters, faucets, and dishwashers. Rust-like staining can appear on sinks and tubs due to mineral deposits interacting with iron components but varies by fixture and usage frequency.
Belief: Hardness levels and rust issues do not change much over time in Lafayette Parish
What the record shows is that hardness levels have varied widely in area wells over the ten-year sampling period, ranging from as low as 26.3 mg/L to as high as 368.0 mg/L. Such variation reflects natural seasonal and multi-year hydrological changes, so local water hardness and rust appearance may fluctuate accordingly.
Belief: A larger family or a seasonal home does not require different considerations for well rust and hardness
What the record shows is that households with greater water demand or intermittent use should evaluate treatment capacity carefully. The documented equipment available, such as the Pentair Well Rust + Hardness System with a grain capacity of 32,000, is designed to handle typical residential needs but assessing daily water volume helps ensure adequate control of hardness and rust-related mineral buildup.
Belief: Well rust and hardness are the same as issues caused by iron or sediment
What the record shows is that while rust-like deposits and water hardness both relate to minerals, hardness primarily involves calcium and magnesium concentrations affecting water taste and scale formation. This differs from iron presence or sediment, which typically cause discoloration and particles. Understanding these distinctions helps select the right approach for treatment.
Samples from 31 wells between 11 and 250 feet deep in Lafayette Parish’s aquifer 112CHCTU define the regional presence and variation of hardness but cannot specify any one private well’s condition. For ongoing water quality clarity, private testing remains essential. More information is available through the U.S. Geological Survey groundwater sampling records.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2021-07-22. 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 112CHCTU aquifer (Lafayette Parish): 56 results from 31 wells, median 106.5 mg/L, range 26.3-368.0 mg/L; none above any federal threshold
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