Public Drinking Water Branch
Water System Design Standards - Updates
The Missouri Department of Natural Resources’ Public Drinking Water Branch has completed it update of Missouri's public drinking water design standards for construction or modification of all public water systems in Missouri.
The current Design Guide for Community Water Systems went into effect Aug. 29, 2003, and Standards for Noncommunity Public Water Supplies has been in effect since 1982. A workgroup of Department of Natural Resources engineers and environmental specialists from around the state have developed proposed revisions to both standards, and combined them into one document. These proposed revisions are intended to improve standards based on new technology and information. The department is currently soliciting public comment on the Regulatory Impact Report. When finalized, our intent is to promulgate the new standards as regulation.
Comments on the second draft of the document have been reviewed and changes have been incorporated into a third draft. The comments received and committee responses to them are now available for viewing.
First Draft Documents
- First Draft This document incorporates draft changes and stakeholder comments made in 2005, along with committee changes in 2009
- Comments and Responses Stakeholder comments received during a 90-day comment period opened after the first draft was posted. A committee response to each comment is included.
Second Draft Documents
- Second Draft This document incorporates changes made as a result of the first draft comments and merges noncommunity standards.
- Second Draft Comments and Responses This document contains stakeholder comments received during a 90-day comment period opened after the second draft was posted. A committee response to each comment is included. Some comments may be paraphrased or grouped.
Third Draft Documents
- Third Draft This document incorporates changes made as a result of second draft comments.
- Third Draft Comparison This document compares the published document, effective Aug. 29, 2003, to the latest draft document and shows only the changes between the two.
- Draft Variance Request
- Necessity for Rulemaking
- Stakeholder Presentation for Safe Drinking Water Commission Dec. 4, 2012
Nov. 15, 2011 - Springfield Attendance
Nov. 10, 2011 - Poplar Bluff Attendance
Nov. 9, 2011 - St. Louis Attendance
Nov. 8, 2011 - Macon Attendance
Nov. 2, 2011 - Kansas City Attendance
Click on a topic to view a summary of the types of changes recommended by the committee.
- Conformance to new regulations
- Updates to reflect revised 10-States and other industry standards
- Response to new technologies
- Response to natural disasters
- Safety and economic considerations
- Clarification and explanation improvements
- Excessively prescriptive language minimized
- Removal of operation and maintenance requirements
- Other language changes
New regulations coming from the Environmental Protection Agency are making it more imperative that systems be designed and built to ensure that the operator can easily find problems in source, treatment, and storage facilities. Once problems are found, access needs to be available to repair or replace problem sources appropriately. In response to this need, the committee has recommended that design and construction reflect more sampling locations and improved access to specific elements of water storage and treatment facilities for maintenance, repair and replacement.
Our community design document borrows heavily from recommended standards developed by the Great Lakes – Upper Mississippi River Board of State and Provincial Public Health and Environmental Managers. This board, also known as “10-States” of which Missouri is a member, revises their recommended standards approximately every four years. The committee revisions to the design standards incorporate updated information provided in the most current (2007) edition of “Recommended Standards for Water Works” as well as updated American Water Works Association (AWWA) standards.
New technologies that have seen use in Missouri have been reviewed for their effectiveness. The committee has added guidelines to the community design guide that recognizes limitations, but should help maximize the effectiveness of these technologies when used.
Missouri weather certainly has been active in recent years. Frequent major flooding and ice storms have taught water systems and regulators some lessons about the adequacy of current measures to protect source water and water works facilities. The committee has made recommendations in direct response to problems identified during natural disasters. Most notably, improved protection is recommended for facilities in or around areas prone to flooding.
The economic downturn has forced many to reflect on ways to reduce costs while attempting to offer the same level of service. The committee would prefer cost reduction measures not come at the expense of the safety of water system operators, maintenance workers and inspectors (and ultimately the customers). The committee has recommended improved design standards that will maintain an adequate level of safety for those charged with serving the public.
The primary purpose of a public water supply system is to provide safe and adequate drinking water to the public. Decisions made by system owners who use primary-use facilities for secondary purposes may have direct implications on the ability of systems to serve their primary purpose. The committee has made new and revised recommendations regarding specific secondary uses of water supply systems and facilities.
Some language in the Design Guide was noted to be somewhat ambiguous in meaning and intent. The committee has attempted to clarify portions of the design guide where significant questions were raised on the intent of the language. In addition, the committee has included more explanatory language to help the reader consider the reasons for some requirements.
Some language was noted to be excessively prescriptive or lacked recognition of alternative methods available to solve engineering problems. Some of the more prescriptive language was removed in favor of providing the design engineer the opportunity to submit information clarifying the reasoning behind engineering decisions.
The Design Guide for Community Water Systems serves a role that is exclusive to design and construction during the effective dates. While the Design Guide does make every effort to address design in a way that will improve maintenance, maintenance schedules and associated costs, it does not attempt to instruct the water system operator on operation and maintenance. Some language was noted to focus on operation and maintenance procedures and was removed from the Design Guide or replaced.
Grammatical errors were located and fixed. Standards and regulation references were updated or fixed.