The Missouri Department of Natural Resources reviews wastewater construction permit applications to determine that plans and specifications for wastewater sewer systems and treatment facilities are complete with regard to the minimum requirements, and the proposed construction is acceptable with regard to accepted design standards for wastewater systems to protect the public health and the environment.



Construction Permit Status

You can search the department’s Missouri Clean Water Information System for construction permit applications in process.  

You can find final construction permits issued on or after Aug. 1, 2009.  

Draft Master General Sewer Extension Construction Permit



Sewer Extension

Standard Sewer Specifications and Details

The department offers a review and approval process for municipalities with standard sewer specifications and details. Municipalities that receive department approval will not be required to submit a copy of their specifications and details with a sewer extension construction permit application. You may view approved and currently under review municipalities.

Sewer Extension Authority Supervised Program

In accordance with 10 CSR 20-6.010(6)(A), the department may grant approval of an entity’s sewer extension authority supervised program when the facility has at least one existing treatment plant equal to or greater than one million gallons per day (1MGD). Entities with a department-approved program are exempt from construction permit requirements for collection systems. Department approval may be granted for a period of five years in the applicant’s operating permit. At the time of the operating permit renewal, the sewer extension authority supervised program must submit a request for reauthorization and the department will reevaluate the authority..

As part of the review, the department verifies that the entity has sufficient engineering review capabilities, has defined procedures for review, construction, and inspection of projects done by others and those projects done by the entity, how plans are maintained permanently, and that the entity’s standard plans and specifications meet the minimum requirements in 10 CSR 20-8, specifically

Approved sewer extension authority supervised program entities are responsible to permit, inspect, and accept sewer extensions constructed within their municipal boundaries and ultimately discharging to a wastewater treatment facility for which they own and act as continuing authority. With an approved program, the entity may have additional requirements in their state operating permit, such as an annual summary report on the projects undertaken during the previous calendar year.

Entities applying for funding under 10 CSR 20-4, “Grants and Loans” will be required to comply with those requirements in addition to their approved sewer extension authority supervised program.

New sewer extension authority program requests must meet the requirements of 10 CSR 20-6.010(6)(B). Municipality wishing to apply for this program should contact the Water Protection Program’s Engineering Section at 573-751-1300 or

Approved Sewer Extension Authority Programs

City of Blue Springs

City of Columbia

City of Kansas City*

City of Jefferson City

City of Joplin*

City of Springfield *

City of St. Peters

Duckett Creek Sanitary District

Metropolitan St. Louis Sewer District

* Denotes entities currently under review during the operating permit renewal period.

New Program Approval Requests

Northeast Public Sewer District

Additional Information


All construction permits for new or expanded discharges are required to follow the Missouri Antidegradation Rule and Implementation Procedure.


For a new wastewater treatment plant, if the design flow is less than 100,000 gallons per day the fee is $500; for a new wastewater treatment plant, if the design flow is equal to or more than 100,000 gallons per day the fee is $1000; for a review in which the existing wastewater treatment train is being retained as part of an upgrade or for a water quality review analysis the fee is $250.

General Antidegradation Review

The General Antidegradation Review has been revised. This voluntary review path is now available to domestic wastewater systems with design flows of up to 50,000 gallons per day and it now incorporates less-degrading effluent limits for Total Phosphorus when the proposed discharge to a Tier 2 water is located in the watershed of a lake greater than 10 acres. Please note the following elements regarding this voluntary path:

  • The department conducted a general analysis of wastewater treatment alternatives for small systems in accordance with the Antidegradation Implementation Procedure, and concluded that there are several available technologies that are capable of producing a high quality effluent. Applicants that wish to use this general analysis only need to complete three documents/forms:
  1. Antidegradation Review Summary/Request
  2. Antidegradation Review Submittal Voluntary Tier 2 -Significant Degradation for Domestic Wastewater Facilities with Design Flows Less than 50,000 gallons per day
  3. Antidegradation: Regionalization and No-Discharge Evaluation. This optional approach would allow applicants to forgo the preparation of a site-specific alternatives analysis and eliminate the need to submit the "Path C” form
  • Section 10 Antidegradation Review Submittal Voluntary Tier 2 - Significant Degradation for Domestic Wastewater Facilities with Design Flows Less than 50,000 gallons per day provides a table of effluent limits that applicants will agree to accept using this approach.
  • This approach would only be available to new or expanding domestic wastewater treatment systems that will discharge to Tier 2 waters (those waters that are not impaired or are classified as Outstanding State or National Resource Waters).
  • The “Antidegradation: Regionalization and No-Discharge Evaluation form is used to demonstrate that regionalization is not feasible nor is land application or subsurface wastewater disposal.
  • The fee for this review will be $500.

Additional Information

Missouri Antidegradation Implementation Procedure - Approved July 13, 2016
Domestic Wastewater Facilities with Design Flows Less Than 50,000 Gallons Per Day

Review Request Forms


Selecting an Engineering Consultant

All engineering reports, plans and specifications must be signed, sealed and dated by a Missouri professional engineer. The procurement of planning and design services is one of the most important steps in the design or upgrade of wastewater systems. 

Qualifications-based selection (QBS) is a recommended process to negotiate procurement of an engineering firm based on qualifications and competence relative to the work to be performed.  Below is a link to the QBS proper procurement steps and information provided by the American Council of Engineering Companies (ACEC) Missouri.

You can search for a licensed professional engineer in the state of Missouri on the Missouri Division of Professional Registration Licensee Search.

Additional Information

Engineering Workshops