Hallsville Backflow-Prevention Devices ordinance (§ 705.420)
Chapter 705: Water Regulations · Article II. Cross-Connection Control
In short: Backflow devices must be models approved by the Water Purveyor and Missouri DNR; air gaps must be at least twice the supply pipe's diameter, never under 1 inch. Older approved, maintained devices are exempt, except from inspection and maintenance rules, until moved, needing more than minimum maintenance, or posing a health hazard.
Our plain-English summary, not the official text or legal advice. The ordinance below is what counts.
A. A backflow prevention device required by this Article shall be of a model or construction approved by the Water Purveyor and the Missouri Department of Natural Resources.
1. Air-gap separation to be approved shall be at least twice the diameter of the supply pipe, measured vertically above the top rim of the vessel, but in no case less than one (1) inch.
2. A double-check valve assembly or a reduced-pressure-principle backflow-prevention device shall be approved by the Water Purveyor and shall appear on the current list of approved backflow prevention devices established by the Missouri Department of Natural Resources.
B. Existing backflow prevention devices approved by the Water Purveyor at the time of installation and properly maintained shall, except for inspection and maintenance requirements, be excluded from the requirements of this Article so long as the Water Purveyor is assured that they will satisfactorily protect the water system. Whenever the existing device is moved from its present location or requires more than minimum maintenance, or when the Water Purveyor finds that the maintenance constitutes a hazard to health, the unit shall be replaced by a backflow-prevention device meeting the requirements of this Article.
Official source: City of Hallsville official Code of Ordinances (online), § 705.420
Last checked November 1, 2026. The city's official copy controls; this page is a reading copy, not legal advice.