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Oklahoma deq 641 2026

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  1. Click ‘Get Form’ to open the Oklahoma DEQ 641 in the editor.
  2. Begin by entering the Work Order No., System No., and Date Received at the top of the form. Ensure these fields are filled accurately for proper tracking.
  3. In the GENERAL INFORMATION section, provide the Name and Mailing Address of the Property Owner. Fill in First Name, Last Name, Street Address, City, and Zip Code. Optionally, include the Owner’s E-Mail Address.
  4. Next, input the Property Address details including Street Address, City, and Zip Code. Include a Legal Description if applicable.
  5. Specify Lot Size in square feet or acres and indicate the County where the property is located.
  6. For Finding Location, describe how far it is from a known point using blocks or miles.
  7. Check the applicable certification regarding flow certification and fill in details about bedrooms or water usage as required.
  8. Finally, certify your information by printing your First Name and Last Name, signing, and dating the document at the bottom.

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Estimated Cost of Septic Systems Conventional System $3,000 - $4,000 Low Pressure Systems $4,500 - $5,000 Aerobic Treatment Units Spray Irrigation Drip Irrigation $5,500 - $6,000 $7,500 - $8,000 ET/A Systems $4,000 - $12,0001 more row
What is the Septic Tank Remediation Program? The Oklahoma Conservation Commission (OCC), with funding through the Oklahoma Water Resources Board, provides technical and financial assistance to homeowners throughout the state of Oklahoma to repair or replace failing systems located near Oklahoma water bodies.
The State of Oklahoma allows non-certified installers to a limited number of systems. However, these installations must be inspected and approved by DEQ personnel before they are backfilled and/or made operational.
As well as planning permission and a septic tank permit (when needed), your new septic tank system must meet the current building regulation requirements for drainage and waste disposal. It is best to work with a competent tradesperson to make sure your installation is compliant with all current rules and regulations.
The Department of Environmental Quality (DEQ) is responsible for keeping drinking water safe, outdoor air clean, and Oklahoma land clean and productive. DEQ is committed to partnering with local communities, businesses, and citizens to identify and implement protective and cost-effective environmental solutions.

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Effective November 1, 2020, Oklahoma DEQ has changed the state law requiring all new systems that are 1,330 or less from a creek or waterway must be an aerobic system. If your new system is 300 or less from a creek you must have a nitrogen reduction aerobic system.

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