GroundRosterJohn H Cook and SonLicensed
| Name | John H Cook and Son |
| License number | 4686E3 |
| License type | Class E (System Contractor) |
| License status | Approved |
| Location | Clayton, Delaware 19938 |
| Phone | (302) 653-9932 |
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What this license covers
- Installation / repair: licensed to build and install septic tanks and drainfields, and to repair or replace failed ones.
How to verify this license
We publish this listing exactly as it appears in Delaware's official licensing records; we do not vouch for the business itself. Before hiring, look up license #4686E3 directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: Delaware DNREC - licensed on-site wastewater treatment and disposal system licensees, last checked 2026-08-16. Verify at the official source.
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