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

Hancock County has hard numbers attached to it. Well water sampled in Blue Hill through a Blue Hill Consolidated School testing project averaged nearly 50 ug/L of arsenic, about five times the 10 ug/L federal standard (Bangor Daily News). That is not an outlier's bad luck. USGS screening of 11,111 Maine wells in 531 towns names Ellsworth and its surroundings one of the state's three large-scale high-arsenic areas (USGS SIR 2010-5199), and Bar Harbor sampling tied to the MDI Biological Laboratory's All About Arsenic project found 6 percent of 85 wells tested in 2021 above the standard, with results ranging from 6.2 to 188.8 ug/L (MDI Biological Laboratory, Bangor Daily News). 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 that 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 the ask is simple: tell us the town and the situation, and a free quote comes back from 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 a free quote for your Downeast well

In a named arsenic cluster, the test is the urgent part. One form starts it, and the quote is free.

Downeast well questions

How high does arsenic actually run Downeast?

Well above the 10 ug/L federal standard in places. Blue Hill well water sampled through a school testing project averaged nearly 50 ug/L, about five times the standard, and Bar Harbor sampling in 2021 returned results as high as 188.8 ug/L. That 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 Blue Hill average, usually push toward whole-house systems. A local quote sized to your number decides it.