Wibaux County Well Water Testing
Private-well guidance for Wibaux County, Montana: USGS area-risk estimates for arsenic and nitrate, a recommended test panel, and how to get your own well tested at a Montana-certified lab.
Wibaux County has a small private-well population. If you're on city (municipal) water, check your city's tap-water quality report — search by city or by ZIP code.
On one of the roughly 361 private wells in Wibaux County? The USGS area-risk estimates below are for you.
Wibaux County groundwater risk (area estimates)
These are modeled USGS estimates for the county area — not a measurement of your specific well.
Arsenic
area estimate4%
modeled chance a well in this area exceeds 10 µg/L (the EPA limit).
12% chance of exceeding 5 µg/L.
Most-probable concentration category: <=5 ug/L.
Nitrate
area estimate0.41 mg/L
predicted nitrate (as N) for domestic-supply depth.
This estimate is below the 10 mg/L EPA limit, but individual wells can still exceed it.
Private wells
area estimate361
people on private wells in Wibaux County.
Roughly 144 households, estimated from the USGS modeled domestic-supply population.
Area context
Additional state-only or optional layers for Wibaux County, shown where the data exists.
Uranium
area estimateA state-only uranium model is not available for Montana. See observed samples and test your own well to learn its uranium level.
Radon
area estimateA state-only radon model is not available for Montana. See observed samples and test your own well to learn its radon level.
Primary aquifer
area contextWells in Wibaux County most likely draw from the Lower Tertiary aquifers (USGS national aquifer code 314). This is the dominant principal aquifer mapped under the county area, not a determination for any single well.
Agricultural land use
area contextAbout 10% of the Wibaux County area is row-crop farmland (USDA Cropland Data Layer). Intensively farmed row-crop land raises the likelihood of elevated nitrate in nearby groundwater, so it is a reason to include nitrate in your test panel. This is land-use context for the county area — not a measurement of nitrate in any well.
These figures are USGS area estimates: statistical groundwater models describing how likely elevated contaminant levels are across a county. They are not designed to predict the concentration in any single well. Only testing your own well reveals its water quality.
Recommended test panel for Wibaux County
- coliform
Coliform bacteria is recommended for every private well as the universal baseline test. The federal loan minimum (FHA, VA, USDA) tests for coliform, nitrate, nitrite, lead.
Federal FHA, VA, and USDA home loans require testing for coliform, nitrate, nitrite, lead at the point of a federally-backed loan. See the program-specific rules: FHA well test, VA well test, USDA well test.
Already have lab results? Interpret your well water test results to see how your own numbers compare to EPA limits.
How Wibaux County compares across Montana
Where Wibaux County's modeled area estimates sit relative to the other Montana counties in our analysis.
- Arsenicbelow the Montana median
Wibaux County: 4% · Montana median: 6% · flagged in 8 of 56 counties.
See all Montana arsenic data → - Nitratenear the Montana median
Wibaux County: 0.41 mg/L · Montana median: 0.42 mg/L · flagged in 0 of 56 counties.
See all Montana nitrate data →
Prefer a Simpler Option?
Can't find a convenient local lab? Mail-in testing offers EPA-certified analysis without appointments or travel.
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Volatile Organic Compounds (VOC) Test
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Detects volatile organic compounds including industrial solvents, fuels, and chemical contaminants.
Find a state-certified lab
Test your Wibaux County well through a lab certified by the Montana Department of Public Health & Human Services — find one in the official directory (Interactive drop-down menus by certification type).
Recognize & research well-water problems
Notice a problem? Diagnose it by symptom
Learn about these contaminants in drinking water
Data sources
Wibaux County's estimates are modeled from public federal datasets. See the data & methodology for how we build, source, and validate them.
- USGS arsenic probability-of-exceedance model
- USGS nitrate predicted concentration, domestic-supply depth
- USGS domestic (private) well population density
- USGS principal aquifers
- USDA NASS Cropland Data Layer (CDL) 30m
- EPA/USGS Water Quality Portal (waterqualitydata.us)
- US Census TIGER/Line county polygons
By TapWaterData Editorial · Last updated June 26, 2026.
Wibaux County well water FAQ
How do I test my well water in Wibaux County?
Order a sample kit covering the recommended panel for Wibaux County (coliform), then send it to a Montana-certified drinking-water laboratory. Certified labs use EPA-approved methods, so the results are defensible for a federally-backed home loan. You can also use a mail-in test kit for a convenient EPA-certified analysis.
What does the USGS arsenic estimate mean for my well?
It is an area estimate, not a prediction for your specific well. The USGS model describes how likely elevated arsenic is across Wibaux County as a whole; an individual well in the county can be much higher or much lower. Only testing your own well reveals its actual arsenic level.
How often should a private well be tested?
The CDC recommends testing private wells at least once a year for total coliform bacteria and nitrate, and more often if you notice a change in taste, color, or odor, or after flooding or nearby construction.
Does Montana require well testing?
Federal FHA, VA, and USDA home-loan programs require a private-well water test at the point of a federally-backed loan. A state sale, rental, or recurring testing mandate was not independently verified for this state — consult your state's program.
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