Caswell Testing & Water Systems
Phone: (410) 557-9355 · https://caswelltesting.com
Pump installer licenses
| License holder | License # | Type | Expires |
|---|---|---|---|
| Billy J. Whipperman | PI0188 | PUMP INSTALLER | 2027-06-01 |
Other state licenses held
| License holder | License # | Type | Expires |
|---|---|---|---|
| John Mellor | MWD590 | MASTER WELL DRILLER - GENERAL | 2027-06-01 |
| Billy J. Whipperman | WCI179 | WATER CONDITIONER INSTALLER | 2027-06-01 |
✓ How this was verified: license data comes directly from
the Maryland State Board of Well Drillers — Active Licensees roster, dated 2026-07-01 and retrieved
2026-08-03. Check the
official roster (PDF) or call the
State Board of Well Drillers at 410-537-4466
to confirm a license is still active before hiring.