Calvert County, Maryland
Calvert is largely unsewered rural/suburban Chesapeake (after Anne Arundel). MDE On-Site Wastewater Professionals / OSDS Registered Individuals list (Updated September 2, 2026) prints registration numbers with streets — those numbers are quoted. Calvert County also requires a county septic installer license (Chapter 110) and a separate scavenger/septage-hauler permit for pumping; Health Department pages state licensed-installer lists are available upon request and do not publish a fetchable street roster online this pass — county scavenger numbers are not invented. News archive cites about 26,376 Calvert septic systems (~85% septic) — older/approximate; do not invent a 2024–2026 tank total. PO Box-only, out-of-county Census matches, and non-septic home-inspector/surveyor rows are omitted.
12 listings · board: MDE / MD State Board of On-Site Wastewater Professionals (OSDS Registered Individuals); Calvert County Health Department (county installer/scavenger — no public street roster)
Listings
| License | Name | Town | ZIP | County |
|---|---|---|---|---|
| 01303 | Southern Shores Septic | Owings | 20736 | Calvert MD |
| 00093 | Hayden's Septic | Huntingtown | 20639 | Calvert MD |
| 00082 | Elite Excavating & Septic Service | Huntingtown | 20639 | Calvert MD |
| 00651 | Quality Well & Septic Service | Prince Frederick | 20678 | Calvert MD |
| 02434 | BS Sucking | Lusby | 20657 | Calvert MD |
| 00233 | Action Wastewater Solutions | Owings | 20736 | Calvert MD |
| 00094 | Jimmy's Septic | Sunderland | 20689 | Calvert MD |
| 01644 | Cotton's Septic | Dunkirk | 20754 | Calvert MD |
| 02441 | Calvert Septics & Excavation | Lusby | 20657 | Calvert MD |
| 01740 | Bay Septic | Solomons | 20688 | Calvert MD |
| 00647 | J. Calvin Wood Jr. | St. Leonard | 20685 | Calvert MD |
| 00525 | DMH Plumbing & Excavating | Huntingtown | 20639 | Calvert MD |