Sewage  Pic for webThe Environmental Health division monitors the proper treatment and disposal of all wastewater for household and small flow (semi-public) sewage treatment systems in a manner which will protect surface and groundwater from contamination. This program also reviews, inspects and regulates new sewage systems, replacement systems and sewage system alterations.


*** Home Sewage Treatment Systems Rules Update***

As of January 1, 2015 new law and rules went into effect that govern Sewage Treatment Systems (STS) and Small Flow On-Site Sewage Treatment System (SFOSTS).  Click here for links to the new law and  latest rules. 


Click here for the state mandated test for sewage treatment system haulers/installers/service providers    


What We Do at the Knox County Health Department 

  • Investigate nuisances created by failing sewage systems.
  • Issue permits for installation, alteration and abandonment of sewage systems
  • Review sewage variance requests to present to the Board
  • Issues permits for small flow (non-residential) sewage disposal systems for the
  • Review plans for subdivisions without access to public water or sewer
  • Review lot splits
  • Provide consultations on proposed alterations or replacement of existing systems
  • Inspect sewage treatment systems for real estate transfers
  • Inspect pumper/tank trucks to assure proper cleaning, transportation and disposal methods

Permit Applications

Soil and Sewage Sampling Knox County Ohio


  • Site Review - $285 (For new systems only. No fee for review of alterations.)
  • Permit to Install for New Construction - $393
  • Permit to Install for Alterations - $338
  • Small flow on-site sewage treatment system (Installation or Replace) - $432
  • Small flow on-site sewage treatment system (Alteration) - $376
  • Total Permit Package (Site, Septic and Well) - $1,047
  • Request for Loan Inspection Services
    • Water Sample Only (Total Coliform- No Written Report) - $70
    • Water Sample w/Written Report to Describe System - $100
    • Sewage Disposal System - $150
    • Sewage & Water System w/Written Report - $225

  • We accept cash, checks, money orders, debit or credit cards for payment.
  • Make checks and money orders payable to the Knox County Health Department.



Provider Lists

Sewage System Maintenance for Homeowners


Frequently Asked Questions

How do I get a site evaluation?

Complete and submit the Site Review Application

How do I get a sewage permit?

Complete and submit the Sewage Permit Application

What steps do I take to repair my system?

Process to obtain a site evaluation then apply for a permit to install

How do I get a real estate sewage inspection?

Complete and submit the Real Estate Evaluation Request Form. Fee is $150.


Helpful Links

Association of Ohio Pedologists

National Onsite Wastewater Recycling Association

National Precast Concrete Association

National Sanitation Foundation

National Small Flows Clearinghouse

Ohio Environmental Health Association

Ohio Onsite Wastewater Association

OSU Soil Environment Technology Learning Lab



Upcoming Events

Quick Links


We Are Public Health

Public Health - Knox County Health DepartmentPublic Health is about focused community efforts to prevent disease, promote healthy lifestyles and protect the environment. It is what we do with our community partners to ensure conditions that support the health and well- being of our residents.


Contact Us

Monday-Friday   8:00 a.m. -  4:30 p.m.
Third Tuesday of every month, open until 6 p.m.

Phone: 740-392-2200    Fax: 740-392-9613

For public health emergencies during
non-business hours, call

740-397-3333, Ext.#1

Directions | Call | Email | Fax

11660 Upper Gilchrist Road
Mount Vernon, Ohio 43050