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 community water systems in Missouri. A workgroup of Department of Natural Resources engineers and environmental specialists from around the state have developed final revisions to community water system standards and draft revisions to noncommunity standards based on new information.
The Minimum Design Standards for Missouri Community Water Systems has been published and is effective as of Dec. 10, 2013. The new community design standards replaces the 2003 publication Design Guide for Community Water Systems for new construction and modification of existing systems.
The Standards for Noncommunity Public Water Supplies has been in effect as a rule since 1982. The department is in the process of replacing this rule with updated standards. Formal rulemaking for noncommunity standards is expected to begin summer 2014.
To be announced
Oct. 11, 2012
Design standards revision stakeholder meeting video Part 1 | Part 2
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.