Hersey, Mark

Licensed septic contractor based in Kiel, WI

"Based in" is the city on the business's state license record. That can be a mailing address; it doesn't tell you where the business works.

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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 the license details exactly as they appear in Wisconsin's official licensing records; we do not vouch for the business itself. Before hiring, look up license #670984 directly with the state, confirm it is still active, and ask for a current certificate of insurance.

Source: Washington County POWTS Program, last checked 2026-08-19. Verify at the official source.