Merrimack County PFAS Treatment & Well Water Solutions

Recent May 2026 USGS modeling shows that groundwater flow from the Coakley Landfill moves primarily north and west through bedrock fractures. If your property is within 3 miles of the landfill, professional testing is mandatory to ensure your PFOA/PFOS levels are below the 4.0 ppt limit.

Eligibility is based on a certified lab test showing any PFAS detection over the current MCLs. Because Portsmouth and Rye have some of the highest historical detections in NH, most private well owners in this area qualify for the full $5,000 NHDES reimbursement.

‍

In Rockingham County, we often see a mix of "long-chain" and "short-chain" PFAS. Granular Activated Carbon (GAC) is a reliable workhorse that uses adsorption to soak up contaminants, but it requires a longer "Empty Bed Contact Time" (EBCT). Ion Exchange (IEX) resins act like a chemical magnet, specifically targeting PFAS ions. For many Exeter and Portsmouth homes with space constraints, IEX is often preferred because the tanks are smaller and the "adsorption kinetics" are faster, though pre-filtration is critical to prevent resin fouling from local minerals.

While PFOA and PFOS have individual limits of 4.0 ppt, the EPA now uses a Hazard Index (HI) for four other PFAS types found in NH: PFNA, PFHxS, PFBS, and HFPO-DA (GenX). The HI is a cumulative calculation; even if these four chemicals are below their individual triggers, their combined "mixture" score must be below 1.0. Our laboratory partners provide a full HI breakdown to ensure your Rockingham property is fully compliant with these 2026 safety metrics.

‍

Absolutely. Many wells in towns like Derry and Londonderry have high levels of iron, manganese, or arsenic. These minerals can "blind" the surface of your PFAS filter media (especially IEX resins), significantly reducing its lifespan. We always perform a comprehensive "General Chemistry" test alongside your PFAS test. If high minerals are present, we install a pre-treatment "knock-out" system to protect your PFAS investment and ensure your water meets "Non-Detect" standards.

To ensure 100% safety, we install PFAS systems in a Lead-Lag (Series) configuration. This means your water passes through two separate tanks. We regularly test the water between the two tanks. When we detect "breakthrough" in the first tank (the Lead), the second tank (the Lag) continues to protect your home. We then rotate the second tank to the lead position and install fresh media in the first. This is the industrial standard for "Forever Chemical" mitigation in NH.

Because PFAS are "forever chemicals," disposal is a technical and legal priority. We do not simply "backwash" these chemicals into your septic system or leach field (which would just re-contaminate your soil). Once the GAC or Resin media is exhausted, we remove the spent media and transport it to a high-temperature thermal destruction facility or a specialized hazardous waste landfill. We provide you with a certificate of proper disposal, which is vital for your home’s 2026 environmental record.