Well water Downeast: Ellsworth, Blue Hill, and the arsenic cluster

Surry is a small Hancock County town with a hard number attached to it: 23 percent of 120 tested wells there exceeded 100 ug/L of arsenic, 10 times the federal standard (Bangor Daily News). That is not an outlier's bad luck. USGS mapping of more than 11,000 Maine wells names the Ellsworth area one of the state's high-arsenic clusters (USGS SIR 2010-5199), and sampling led by the MDI Biological Laboratory found high arsenic in about six percent of Bar Harbor wells tested (MDI Biological Laboratory). From Ellsworth across the Blue Hill peninsula to the Bar Harbor fringe and east to Machias, this is the Maine region where an untested well is the biggest gamble.

The mechanism is geological. Arsenic-bearing minerals in Downeast bedrock dissolve into the groundwater that drilled wells draw from, with no taste, smell, or color at any concentration a home well sees. Neighboring wells can differ wildly, so the cluster is a reason to test, never a substitute for testing.

Testing, Downeast edition

Maine CDC's cadence applies with extra force here: coliform bacteria and nitrates yearly, and arsenic, uranium, radon, and fluoride every three to five years (Maine CDC testing guidance). In a cluster region, a first-ever arsenic test on an older well is the single highest-value errand a homeowner can run. The testing page covers kits and certified labs, and the arsenic data page puts Hancock and Washington County towns in statewide context.

Treating high-arsenic water

Results in the Surry range change the engineering conversation. Modest exceedances are often handled at the kitchen tap with reverse osmosis; results many times the standard usually point to whole-house media systems, and the professional sizing the fix will want the full lab report, not just the arsenic line. The arsenic treatment page walks through both designs with honest cost ranges, and the results explainer covers what retesting to confirm a spike looks like.

Cost help exists for the hardest cases. The MaineHousing Well Water Abatement program has offered assistance to eligible homeowners facing contaminated wells; check current funding status at MaineHousing. In a region where results can run 10 times the standard, that program is worth five minutes before any homeowner concludes treatment is out of reach.

Getting it done out here

Distance is the Downeast tax on every service call, so we keep the matching simple: tell us the town and the situation, and we connect you free with an independent professional who covers this part of the coast. The full coverage map is on the service areas page.

Towns served in this region: Ellsworth, Surry, Blue Hill, Bar Harbor, Gouldsboro, and Machias.

Get matched with a Downeast well professional

In a named arsenic cluster, the test is the urgent part. One form connects you with an independent local pro, free.

Downeast well questions

What does 100 ug/L of arsenic actually mean?

It is 10 times the 10 ug/L federal drinking water standard. In Surry, 23 percent of 120 tested wells hit that level, which is why Downeast testing is not a formality. Health effects of long-term arsenic exposure are documented by Maine CDC and EPA; the response to any high result is the same: retest to confirm, then treat.

My neighbor tested clean. Does that clear my well?

No. Arsenic in this region comes from mineralized zones in the bedrock, and two wells a few hundred feet apart can draw from different fractures with very different chemistry. The Ellsworth cluster is a pattern across many wells, not a uniform blanket. Each well needs its own lab result.

How do Downeast owners get water to a lab?

The state lab in Augusta sells mail-order kits, and certified private labs serve the region; Maine CDC publishes the full certified list. Sampling takes minutes with the provided bottles. For high-arsenic country, ask for a panel that includes arsenic, uranium, and radon along with the yearly bacteria and nitrate tests.

If arsenic shows up, what will the fix cost?

Published ranges put under-sink reverse osmosis at $150 to $1,300 plus install, and whole-house arsenic treatment around $2,000 to $3,000 installed plus yearly media, per This Old House and an EPA-hosted fact sheet. Very high results, like the Surry range, usually push toward whole-house systems. A local quote sized to your number decides it.