A soil sample comes back during due diligence. The number on the lab report is higher than the buyer expected. Two years ago, that reading might have ended a deal in East Helena, or at least cratered the price. This year, it's more likely to trigger a phone call from a county contractor asking to schedule a free yard replacement.
That shift did not happen by accident, and it has not fully caught up with how people talk about buying and selling near the old ASARCO smelter site. The story most people still carry around is the 1984 one: a lead and zinc smelter, a Superfund designation, a company town built around an industry that eventually poisoned its own ground. All of that is true. What is missing from that version is what has happened since 2024, when the rules governing who gets help, and how much help, changed in ways that matter directly to anyone with a closing date on the calendar.
The Number That Changed in 2024
For most of the cleanup's history, a yard in East Helena only qualified for remediation if soil-lead levels hit 1,000 parts per million. In January 2024, the EPA finalized a document called an Explanation of Significant Differences that lowered the residential cleanup level to 400 ppm and eliminated the old 1,000 ppm action trigger entirely, as reported by the Montana Standard. That single change opened up cleanup eligibility for hundreds of properties that had tested positive for contamination for years but never crossed the old threshold.
The following month, February 2024, the EPA announced $40 million in federal infrastructure funding for the site, on top of roughly $10 million left over from ASARCO's original settlement, earmarked specifically for yard remediation at the lower threshold. That funding sits alongside the nearly $100 million ASARCO placed into a cleanup trust back in 2009 when the company went bankrupt, the trust now managed by the Montana Environmental Trust Group.
For a seller, this is the detail that matters more than the history. A property that would have been told "you don't qualify" under the old rule may now qualify automatically. For a buyer, it means a soil report showing 500 or 600 ppm is not the dealbreaker it once was. It is closer to a work order.
What "Free" Looks Like on the Ground This Summer
The cleanup is not a slow-moving bureaucratic promise. It is an active construction program with a contractor, a budget, and a five-year runway. In March 2026, Weston Solutions, a remediation firm with an East Helena office, was awarded a $100 million contract by the U.S. Army Corps of Engineers to carry out the yard replacements, according to reporting on the contract award.
According to Montana Free Press, the EPA has remediated roughly 1,500 properties in East Helena since 2024, including about 700 residential yards and another 800 sites such as schools, playgrounds, and alleys. Another 200 East Helena homes have been identified for excavation this summer alone. EPA Region 8 Administrator Cyrus Western told the outlet the work will continue every summer through 2031.
Crews remove and replace yards that sample at or above 400 ppm within the Superfund boundary. The excavated soil goes to the slag pile near the old smelter site, where it is expected to eventually help form the base of a permanent protective cap over that pile. None of this touches the home itself. It is yard and topsoil work, scheduled, funded, and running on a published multi-year timeline rather than a case-by-case appeal.
Here is how the pieces line up chronologically:
| Year | What Happened |
|---|---|
| 1984 | EPA designates the ASARCO smelter site a Superfund cleanup site |
| 2001 | Smelter operations shut down after more than a century |
| 2009 | ASARCO bankruptcy settlement funds a cleanup trust, now managed by the Montana Environmental Trust Group |
| 2013 | State adopts the East Valley Controlled Groundwater Area, restricting new wells in plume-affected zones |
| Jan 2024 | EPA lowers the residential soil-lead cleanup level to 400 ppm |
| Feb 2024 | Site receives $40 million in federal infrastructure funding for yard remediation |
| Sep 2024 | EPA and USACE finalize the interagency agreement to run remedial work |
| Mar 2026 | Weston Solutions awarded $100 million contract to perform the cleanups |
| 2026 | EPA's Sixth Five-Year Review of the site's remedy is underway |
What This Means If You're Selling
The Institutional Controls Program that governs the old smelter footprint applies to construction and soil-disturbance permits, not to the sale of a home. There is no separate soil inspection required before an East Helena listing can close. What exists instead is a public record of where the cleanup stands, property by property, maintained through Lewis and Clark County's interactive GIS mapping site, which includes a layer showing which properties have already been remediated, which tested below the action level and needed no work, and which have not yet been remediated.
Before listing a home anywhere near the historic smelter footprint, it is worth knowing which of those three categories your property falls into. A yard that has already been replaced is a selling point, not a liability, since it means the free work is done and documented. A yard that has not yet been remediated is not automatically a problem either, but a buyer's agent or inspector may ask about it, and having an answer ready beats finding out mid-escrow.
A short list worth working through before you list:
- Check your address against the county's Institutional Controls map layer
- Call the Lead Education and Assistance Program office at East Helena City Hall if your status is unclear
- If you're planning any landscaping or foundation work before selling, confirm whether it counts as soil disturbance under the ICP, since permits are required for moving more than about a cubic yard of soil, roughly a pickup truck load
- Mention the neighborhood's remediation status plainly to your buyer's agent rather than waiting for it to surface in inspection
None of this requires a lawyer or a specialist. It requires knowing the map exists and checking it once.
What This Means If You're Buying
The same map that helps sellers works in reverse for buyers. Before writing an offer on a property near the smelter footprint, pull up the county's Institutional Controls layer and see where the lot sits. A property already marked remediated has had its yard replaced at no cost to the owner. A property that has not been remediated yet is a candidate for the ongoing program, which is scheduled to run every summer through 2031.
The distinction that actually matters for a buyer is between the residential lots covered by this program and the former smelter plant site itself, which remains classified as undevelopable and is a different piece of ground entirely. Land north and west of the old plant, where the Montana Environmental Trust Group has been selling and donating parcels since the 2009 settlement, has already become two schools, roughly 300 homes, a 26,000-square-foot commercial center, an 8-mile trail system, and a new rodeo arena. The Highland Meadows subdivision off Valley Drive is one visible example of what that reclaimed land looks like once it clears the cleanup bar.
If your search includes anything with a private well, the East Valley Controlled Groundwater Area matters too. Adopted in 2013, it restricts new well installation in areas where the site's groundwater plumes have migrated, with arsenic reaching toward Prickly Pear Creek and selenium stretching out toward Canyon Ferry Road. The EPA's own monitoring shows those plume concentrations have been dropping, but the restriction on new wells in that zone is still active regardless of how clean the water tests today.
The Wrinkle Nobody's Advertising Yet
The 400 ppm threshold that unlocked all of this funding is not guaranteed to be the final word. In October 2025, the EPA issued an updated federal lead directive that changes the blood lead level of concern and the soil screening level used at Superfund sites nationally. The agency has said it is still evaluating what that directive means specifically for East Helena. At the same time, the site's Sixth Five-Year Review, the periodic checkup required by law to confirm a cleanup remedy is still protective, is underway now and due for completion sometime in 2026.
Neither of those processes changes anything about a transaction happening today. But if you're a builder or developer with a multi-year timeline on former ASARCO land, or a buyer planning a major renovation on a lot that hasn't been sampled yet, it is worth knowing the ground rules could shift again before your project breaks ground.
Frequently Asked Questions
Do I have to test my soil before selling a home in East Helena? No. There is no soil test required as part of closing. The Institutional Controls Program applies to permits for construction and soil-disturbance work, not to the sale itself. Checking your address against the county's map before listing is a smart step, not a legal requirement.
What if my property has already been remediated? That status is documented on Lewis and Clark County's interactive Institutional Controls map. If your yard already received the free replacement, it is worth mentioning to buyers directly, since it answers a question before it becomes a concern during inspection.
Does this affect well water too, or just soil? Both are addressed, but through different mechanisms. Soil remediation is the yard replacement program described above. Groundwater is managed separately through the East Valley Controlled Groundwater Area, which restricts new well permits in the zone where the site's arsenic and selenium plumes have migrated, regardless of current soil-lead status on a given lot.
If you're weighing a purchase or a listing anywhere near East Helena's old smelter footprint, the details above change the conversation from "is this a red flag" to "where exactly does this property stand." Cameron Hahn tracks the Institutional Controls map, the cleanup schedule, and the subdivisions built on reclaimed land as part of everyday work in this market. Schedule a free consultation to talk through what your specific address actually shows before you list or make an offer.
