Residential Chromium-6 Treatment Options in York County ME: Understanding Sanford Water District’s Sampling Data
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What do 'detected', 'median', and 'range' mean in the Sanford Water District chromium-6 sampling data?
The Sanford Water District in York County, serving over 14,000 people, participated in the EPA’s Unregulated Contaminant Monitoring Rule (UCMR3) from 2013 to 2015. The sampling results show that chromium-6 was detected in 18 of 24 samples, with concentrations ranging from the reporting level of 0.03 micrograms per liter (µg/L) up to 0.5 µg/L. The median of these detections was 0.11 µg/L. Here, 'detected' means the analytical instruments measured chromium-6 at or above the 0.03 µg/L reporting level; it does not imply any health-based violation or unsafe condition. The 'median' is the middle value of detected concentrations, offering a typical data point in the range of measurements. The 'range' describes the lowest and highest detected values in the samples. This information reflects the system's water quality during the monitoring period but does not confirm any individual home’s water characteristics, which require specific testing.
Which fixtures, appliances, or processes are affected first by chromium-6 and why?
Chromium-6 in water is a dissolved contaminant that travels through the household plumbing system and is present in water used at every fixture and appliance. Because it is soluble and does not settle or accumulate significantly within pipes, the first points of contact—kitchen faucets, drinking water taps, and showers—are where people most directly encounter chromium-6. Appliances such as ice makers and coffee machines also draw water that may contain chromium-6. However, the levels measured within the Sanford Water District have no reported health-based violations, meaning standard household use does not trigger regulatory concerns. Those wanting to reduce chromium-6 exposure may consider targeted filtration on point-of-use devices or whole-house treatment to address water before it reaches any fixture.
How do sampling depth, well depth, or source type influence expectations for chromium-6 levels in Sanford’s water supply?
The Sanford Water District uses groundwater sources to supply its municipal water. Groundwater sources can vary in chromium-6 levels depending on geology and human activity. Sampling during the UCMR3 program was conducted at points within the public water system distribution, reflecting treated water delivered to consumers rather than raw well water. Because groundwater is naturally filtered through soil and rock, dissolved contaminants like chromium-6 may appear in varying degrees influenced by depth and local conditions. Individual wells may have different chemistries depending on well depth and surrounding geology. Therefore, residential users relying on private wells should obtain specific water testing to understand their own chromium-6 levels rather than assuming they match system-wide measurements.
What distinguishes chromium-6 from the two problems most often confused with it?
Chromium-6 refers specifically to the hexavalent form of chromium, a chemical state different from total chromium, which includes all oxidation states of chromium. Total chromium levels measured in the Sanford system were lower and less frequently detected than chromium-6, with seven out of 24 samples showing detections. Chromium-6 is also distinct from other common water concerns like iron and manganese, which primarily cause staining and taste issues rather than involving chromium chemistry. While total chromium has a federal Maximum Contaminant Level (MCL) of 100 µg/L, there is no federal MCL for chromium-6 specifically. The EPA’s UCMR3 monitoring focused on chromium-6 to gather occurrence data to inform potential future regulation. Thus, chromium-6 requires different consideration from the broader category of chromium and unrelated contaminants.
How can residents compare Sanford’s chromium-6 data with neighboring counties without overreading it?
When reviewing chromium-6 data from nearby counties, it is important to remember that each water system’s sampling reflects its unique source water, treatment processes, and monitoring periods. Sanford’s data showed detections mostly below 0.5 µg/L with no health-based violations. Comparing this to neighboring counties may reveal different ranges or medians, but these differences do not automatically mean one county’s water is safer or less safe. Variability in sampling methods, timing, and analytical detection limits also affect results. Homeowners should use system-wide data as a starting point while focusing on testing their own water supply to understand localized conditions. Regional comparisons are informative but not definitive for individual household decisions.
In summary, the Sanford Water District’s chromium-6 sampling from 2013–2015 shows measurable presence of chromium-6 without any health-based violations for its groundwater-based public system serving York County. This data applies to the system as a whole and not to individual household water. Residents choosing treatment options have access to products like the C-Series Chromium-6 Filter, which ships ready to configure to reduce chromium-6 effectively. For personalized assessment, testing your own well or tap water is essential to match treatment to your specific needs. The full UCMR3 monitoring results and system details are available from the EPA’s public water system records online.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2013-08-07. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Sanford Water District (ME0091410), ME: 48 results across 2 listed contaminants, 25 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L