Understanding Arsenic Levels in Coconino County: What Area Sampling Reveals About Your Household Water

Government records from U.S. Geological Survey groundwater sampling in Coconino County’s aquifer 374MUAV document arsenic detection in local wells. Fourteen results from one well sampled between June 2013 and April 2026 show arsenic present in all samples at levels ranging from 0.16 to 0.5 micrograms per liter, with a median of 0.27 micrograms per liter. Notably, none exceed any federal threshold for arsenic concentration.

Questions Relevant to Commercial or Industrial Water Uses but Not to Households

Are precise arsenic concentrations verified continuously?

Commercial and industrial operations require ongoing, validated arsenic monitoring at multiple points, unlike typical household needs where periodic testing suffices.

Is water treatment designed to handle variable flow rates and volumes?

Industrial systems must address large water volumes with fluctuating arsenic levels, a consideration beyond average residential consumption.

Are regulatory discharge permits affected by arsenic content?

Businesses face discharge limits and reporting obligations linked to arsenic, whereas households primarily focus on intake water quality.

Adjustments for Larger or Seasonal Households

Does household size influence arsenic treatment needs?

More residents increase water usage, potentially requiring higher capacity filtration equipment to maintain efficacy against arsenic.

How does a second or seasonal home affect arsenic management?

Intermittent use can lead to standing water that might require periodic flushing or filtration checks before regular use.

Information to Note Before Seeking Treatment Advice

Record your water source and its characteristics

Understanding if your water comes from a private well or municipal source helps clarify arsenic exposure risks.

Compile any test results you have on your own water

Area data does not establish your water’s arsenic level; testing your water is essential for personalized treatment decisions.

Note your household size and water use patterns

This helps select appropriate treatment equipment capacity and technologies.

Interpreting Area Sampling Data as a Homeowner

Median arsenic concentration of 0.27 micrograms per liter

This value represents the middle point of measured levels in the sampled well over the recorded period.

Range from 0.16 to 0.5 micrograms per liter

This range shows variability during sampling but remains below any federal arsenic limits.

Meaning of These Measurements Relative to Federal Standards

None of the recorded arsenic levels exceed federal maximum contaminant levels

Federal limits for arsenic in drinking water protect public health; these samples fall safely below that threshold.

Detection alone does not indicate water is unsafe

Finding arsenic through sampling only means it was measurable, not that it poses a health risk at these low concentrations.

What Area Sampling Data Does Not Establish

These area results cannot specify the arsenic concentration in your household well or tap water. Only direct testing of your own water supply can determine your home's arsenic levels. Additionally, the presence of arsenic in the area does not imply your water is unsafe or noncompliant with standards. For homes seeking to reduce arsenic that may be present, a C-Series Arsenic Filter ships ready to configure and offers a documented method to reduce arsenic concentrations effectively.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2026-04-21. 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 Arsenic in the 374MUAV aquifer (Coconino County): 14 results from 1 wells, median 0.27 ug/L, range 0.16-0.5 ug/L; none above any federal threshold