Chromium-6 in Douglas County Water: Seasonal and Source Variations for Lawrence Households

The EPA's unregulated contaminant monitoring data for the City of Lawrence, Kansas (system KS2004503), documents chromium-6 detections in all 16 samples taken from May 2013 through February 2014. The highest chromium-6 level measured was 2.3 micrograms per liter (µg/L), with a median of 1.165 µg/L among detections. These values reflect conditions in the public water system serving Lawrence and do not specify the quality of any individual household's water.

If you want to understand seasonal or multi-year variation in chromium-6 levels

The EPA sampling took place over approximately nine months, from spring 2013 into early 2014, showing consistent detection of chromium-6 during this period. Chromium-6 concentrations can fluctuate with seasonal changes in source water composition, particularly since Lawrence draws its water from surface supplies. Variations in rainfall, runoff, and environmental factors influence these levels year to year. While the data provide a snapshot, ongoing monitoring would be needed to see longer-term trends or peaks beyond the documented range.

If you want to know why chromium-6 aesthetic secondary standards differ from health-based limits

Chromium-6 currently has no federal maximum contaminant level (MCL) specific to it, though total chromium is regulated at 100 µg/L. The chromium-6 amounts found in Lawrence water are well below this total chromium MCL. Secondary standards address aesthetic issues such as taste, staining, or water corrosivity, not direct health risks. Understanding this distinction helps set realistic expectations about water appearance or taste changes versus safety concerns.

If you want to consider the impact of plumbing material and age on chromium-6

While the public water record informs you about source water quality, household plumbing can affect what you notice at the tap. Older pipes or certain materials may alter water chemistry, potentially influencing how chromium-6 behaves or is perceived in your home water. Testing your tap water separately is needed to assess your specific situation, as household plumbing might either reduce or concentrate contaminants.

If you want to understand how sample depth, well depth, or source type affects chromium-6 expectations

Lawrence’s public water system relies on surface water, not wells or deep aquifers. Surface water sources often experience more variable chemistry due to environmental inputs compared to groundwater, which can result in fluctuating chromium-6 levels. Private well owners or users of other source types should not assume the same concentrations occur in their water. Individual water testing remains essential for accurate assessment.

If you want to know which fixtures or appliances might show chromium-6 effects first

Chromium-6 itself does not typically cause visible deposits or immediate appliance damage at the levels detected. However, water with varying mineral content can influence fixtures with water contact, especially those that heat or store water like water heaters or ice makers. Monitoring these appliances and noticing taste or appearance changes can guide whether treatment consideration is warranted.

If you want to explore the treatment technology that addresses chromium-6 at home

The Autotrol Chromium-6 Filter is designed to reduce chromium-6 concentrations in residential water supplies. This system ships ready to configure and employs filtration technology targeted to address chromium-6 as documented in regulatory and scientific testing. Selecting treatment based on your measured household demand ensures effective management of chromium-6 levels specific to your water.

If your current equipment is no longer adequately managing chromium-6 or household water needs, the Autotrol Chromium-6 Filter offers a direct-purchase solution tailored for Lawrence water conditions as documented by EPA records. Testing your tap water for chromium-6 concentration and daily water use helps match treatment capacity appropriately to your home’s requirements.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2014-02-19. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for City of Lawrence (KS2004503), KS: 32 results across 2 listed contaminants, 29 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L