Lawrence’s Water Supply and Chromium-6 Presence
The City of Lawrence, serving over 95,000 residents across Douglas County, relies on surface water sources for its public water system. Water passes through treatment processes before reaching homes, yet federal monitoring found consistent detections of chromium-6 (hexavalent chromium, Cr(VI)) in water samples collected between 2013 and 2015. These detections help establish what can be expected on a system-wide level but do not reveal individual household water quality.
Trivalent versus Hexavalent Chromium: Why Total Chromium Data Is Insufficient
Total chromium measurements encompass both trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)). These forms differ chemically and in potential effects. For example, while the Environmental Protection Agency sets a maximum contaminant level (MCL) of 100 micrograms per liter (µg/L) for total chromium, no federal MCL exists specifically for chromium-6. The City of Lawrence’s data showed chromium-6 detected in all 16 samples at concentrations up to 2.3 µg/L, whereas total chromium peaks were similar but cannot indicate chromium-6 levels accurately. Knowing only total chromium levels cannot determine the presence or quantity of chromium-6 at a particular location.
California’s Limit for Chromium-6 and Its Context Elsewhere
California has established a public health goal and regulatory response level of 10 µg/L (parts per billion) for chromium-6 due to concerns about its effects. This threshold guides mitigation efforts in that state but does not represent a federal standard or apply elsewhere directly. Lawrence’s public water system results, while showing chromium-6 concentrations generally below California’s guideline, reflect detection rather than violation or health risk. Residents outside California can consider this context but should rely on local regulations and testing for guidance relevant to their home.
Recognizing Household Symptoms and Limitations in Diagnosis
Households with chromium-6 concerns might not observe obvious indicators since chromium-6 typically does not cause taste, odor, or visible staining changes at the measured concentrations. Equipment breakdowns, such as failure of existing water treatment devices, do not necessarily pinpoint chromium-6 as the cause without specific water testing. Symptoms like corrosion or staining are generally unrelated to chromium-6 levels found in Lawrence’s water supply.
Public System Records and the Need for Individual Water Testing
Public water system monitoring data represent averages for many connections and sampling points, providing a general profile of municipal water quality. They cannot confirm the chromium-6 concentration in any single household’s water. For certainty about chromium-6 levels, an individual water sample analyzed by a certified laboratory is essential. Such testing identifies the specific chromium-6 presence at the household tap, distinguishing it from the general system data.
Considering the Impact of Untreated Chromium-6 Over Time
Chromium-6 is a chemical form of chromium that can persist in water without effective treatment. Long-term exposure to elevated chromium-6 levels has raised health concerns, which is why monitoring and management are important. However, the concentrations identified in Lawrence’s water system remain low relative to thresholds used in some regulatory contexts. Untreated water with chromium-6 at these detected levels does not necessarily lead to immediate or obvious household issues but emphasizes the importance of awareness and, where desired, targeted treatment.
Final Note on Lawrence’s Public Water System Record
Data provided by the EPA’s Safe Drinking Water Information System (SDWIS) indicate chromium-6 was detected in the City of Lawrence's water system between 2013 and 2015, with no health-based violations recorded. This information reflects system-wide monitoring and should be used as a starting point for understanding local water quality. For individual water concerns, direct sampling and lab analysis are recommended.
Addressing chromium-6 effectively at the household level can involve specialized filtration equipment. The Pentair Chromium-6 Filter ships ready to configure for residential use, offering a documented solution to manage chromium-6 in home water supplies.
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