Uranium in Maine well water
In Maine, 7% of 23,366 private wells tested had uranium above the Maine guideline (30 ug/L), according to Maine CDC.
Uranium in well water comes from granite bedrock. Its main health effect is chemical toxicity to the kidneys rather than radiation. It is common in the same areas where radon and arsenic occur.
Check your uranium number
Type the value from your lab report. It is compared to the Maine guideline and the EPA limit, the same way the full interpretation does it.
Test your Maine well for uranium
Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.
Order the Tap Score well water test kit, from $209Already tested? Upload the report
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Systems that remove uranium
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Some links below are affiliate links. If you buy through one, the merchant pays us a commission at no extra cost to you. It does not change which products we list or what the data says.
For uranium
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
For uranium
Whole-house arsenic and uranium filter
whole-house, at the point of entry, about $2,500
Adsorptive iron-based media; sized to your well yield.
Rather have it installed and sized for your well? Book a free in-home water test with a licensed local company.
Where to get a well tested for uranium in Maine: certified labs, state programs and prices.
By county, from homeowner tests
Share of private wells above the state guidance level (30 ug/L) in tests homeowners sent to the state lab, to .
| County | Above state level | Wells tested | Highest |
|---|---|---|---|
| Cumberland | 3,441 | ||
| Androscoggin | 1,016 | ||
| Oxford | 953 | ||
| Hancock | 2,264 | ||
| Lincoln | 1,490 | ||
| Waldo | 1,191 | ||
| Kennebec | 4,005 | ||
| Franklin | 645 | ||
| Knox | 548 | ||
| Somerset | 811 | ||
| Washington | 1,067 | ||
| York | 1,835 | ||
| Sagadahoc | 876 | ||
| Penobscot | 2,167 | ||
| Aroostook | 772 |
Towns with the highest share above the state level
- Naples, Cumberland County56% of 163 wells
- Prospect, Waldo County51% of 49 wells
- Sebago, Cumberland County45% of 51 wells
- Casco, Cumberland County44% of 100 wells
- Raymond, Cumberland County43% of 162 wells
- Gray, Cumberland County34% of 235 wells
- Dedham, Hancock County34% of 71 wells
- New Gloucester, Cumberland County34% of 179 wells
- Otis, Hancock County33% of 36 wells
- Rome, Kennebec County32% of 62 wells
- Swanville, Waldo County32% of 56 wells
- Poland, Androscoggin County31% of 123 wells
- Cumberland, Cumberland County30% of 164 wells
- Minot, Androscoggin County30% of 71 wells
- Bridgton, Cumberland County28% of 125 wells
- Waldoboro, Lincoln County28% of 107 wells
- Falmouth, Cumberland County27% of 144 wells
- Fryeburg, Oxford County26% of 38 wells
- Denmark, Oxford County26% of 35 wells
- Standish, Cumberland County26% of 235 wells
- Farmingdale, Kennebec County24% of 79 wells
- North Yarmouth, Cumberland County24% of 126 wells
- Ellsworth, Hancock County22% of 287 wells
- Orland, Hancock County20% of 86 wells
- Smithfield, Somerset County19% of 36 wells
By county, from individual samples
Public monitoring samples against the EPA limit (30 ug/L); counties with at least 30 samples.
| County | Above EPA limit | Samples | Detected | Median | Highest |
|---|---|---|---|---|---|
| Cumberland | 32 | 78% | 2.57 | 960 ug/L | |
| Kennebec | 48 | 81% | 1.69 | 320 ug/L |
Sources
- Maine Tracking Network private well summaries: Town summaries of private well tests run by the Maine Health and Environmental Testing Laboratory, published by Maine CDC through the Maine Tracking Network. Shares are against Maine's guideline for each analyte (arsenic 10 ug/L, uranium 30 ug/L, fluoride 2 mg/L, manganese 0.3 mg/L, nitrate 10 mg/L, nitrite 1 mg/L). Towns with too few tests are suppressed (NR). Only the share above the guideline and wells tested are published; no medians. Retrieved September 3, 2026.
- Individual samples from the USGS Water Quality Portal and state monitoring, summarized per geography. uranium counts and shares are listed on each county and town page with their sources.