Verified ranking · Updated June 2026
Best Basement Waterproofing in Nashua, NH
How we rank (the Bedrock Standard). Every figure below is dated and sourced; star ratings change over time. We read five-star share together with review depth, so a near-perfect share on a large review base counts for more than a perfect score on a small one.
Leads the Nashua Google local pack and carries by far the deepest verified review base of any waterproofer here (4.8 across 676 Google reviews, June 2026), operating next door in Hudson. Family-owned local accountability, a clean BBB record (A+, accredited 2015, 2 complaints in three years), and the deepest documented radon track record in the set as a National Radon Defense contractor. It installs the national Basement Systems product line rather than a system of its own.
Serves Nashua, appearing in the organic results rather than the local 3-pack, and holds a high 4.9 across 567 Google reviews with a patented national product line and in-house financing. It ranks second on our methodology because it is a national consolidator (headquartered in Virginia Beach, VA) whose warranty service runs through the national company, and its corporate BBB profile shows 741 complaints closed in three years, about 69 percent of them service or repair.
Also serving the area
In the Nashua Google 3-pack and a long-running B-Dry System franchise (more than 40 years) under new local ownership as of 2026, based across the state line in North Billerica, MA. It carries a perfect rating on a small, recent Google base (5.0 across 10 reviews), so read it as a strong early signal rather than a deep track record.
The Manchester-area foundation crack-injection specialist (epoxy and urethane), multi-region and within reach of Nashua. The right, lower-cost call for a single wall crack or a leaking bulkhead rather than a whole-basement water problem (4.8 across 51 reviews).
Side-by-side
| Company | Type | Google (June 2026) | Named system | Published warranty | BBB |
|---|---|---|---|---|---|
| Erickson Foundation Solutions | local national brand | 4.8 / 676 | Installs the national Basement Systems line (TripleSafe, SaniDry, WaterGuard) rather than a self-branded system | Transferable written warranty (duration not stated). | A+, accredited 2015, 2 complaints (3yr) |
| Groundworks | national consolidator | 4.9 / 567 | Patented national product line (IntelliJack, AquaStop) | Lifetime, transferable, nationally backed (verbatim terms not verified). | A+ (corporate); 741 complaints closed in 3 years, 514 Service/Repair (~69%), per BBB national profile, accessed June 2026 |
| B-Dry System of New England | local national brand | 5 / 10 | The B-Dry System (national waterproofing franchise: French drains, sump pumps, battery backups) | B-Dry System warranty (written terms not independently verified; ask at quote). | Not assessed here |
| Crack-X | local national brand | 4.8 / 51 | The Crack-X process (epoxy/urethane crack injection; not full perimeter drainage) | 10-year transferable warranty on most wall cracks. | A+ but not accredited (Manchester profile) |
Head-to-head comparisons
- Groundworks vs 603 Basement Solutions
- 603 Basement Solutions vs Erickson Foundation Solutions
- Local Independent vs National Consolidator
- 603 Basement Solutions vs Crack-X
- Groundworks vs Erickson Foundation Solutions
- Crack-X vs Groundworks
Other services in Nashua, NH
- Best Foundation Repair in Nashua, NH
- Best Crawl Space Encapsulation in Nashua, NH
- Best Radon Mitigation in Nashua, NH
Data verified as of the dates shown; star ratings change over time. See our methodology.