Commandant United States Coast Guard2100 Second Street, S. Washington, DC 20593-0001 Staff Symbol: G-WKS Phone: (202) 267-1883COMDTINST M6240.5 10 October 1999 COMMANDANT INSTRUCTION M6240.5 Subj: 1. District Commanders: Ensure units under their operational control carry out this Manual's provisions. DIRECTIVES AFFECTED: FORMS AND REPORTS: Local reproduction is authorized of CG-5648 (6-98), Potable Water Quality Log, found in Appendix 1. DISCUSSION: Few environmental factors affect an individual's well-being more than an adequate supply of potable (drinkable) water. The MDR can measure halogen residuals at the tank and various points in the distribution system to identity the loss of disinfectant in the system and possible sources of problems. Disinfectants, including chlorine and bromine, react with virtually any substance in water; this process may neutralize them.WATER SUPPLY AND WASTEWATER DISPOSAL MANUALPURPOSE: To provide standards and public health information for Coast Guard personnel responsible for producing, storing, monitoring, and using potable water and wastewater systems at afloat and ashore units. Commanders of Maintenance and Logistics Commands: Ensure units under their operational control carry out this Manual's provisions and provide technical oversight and support to all units within their area of responsibility to ensure compliance with this Manual. Assistant Commandants for Directorates and Special Staff Offices at Headquarters: Perform all duties related to policy guidance and direction. An impaired potable water system may adversely affect health, mission, and morale. The water supply's halogen demand varies with the amount of interfering or neutralizing substances present, since they reduce the initial supply of chlorine or bromine added to the water. Area Commanders: Ensure units under their operational control carry out this Manual's provisions. As the tanks are placed on line, the chlorine or bromine residual should be detectable at points throughout the distribution system.

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In addition to this Instruction, units must coordinate with their servicing Maintenance and Logistics Command, state regulating authority, and the Environmental Protection Agency to determine applicable regulations.6.b./s/ JOYCE M. What is the water source* (1) (2) (3) (4) (5) Shore (direct pressure). Mixture of water remaining in ship's tanks and shore water. Does the water have a characteristic taste or odor* This is quite vague, but sometimes it is possible to determine the source of a water problem by a distinctive taste or odor.

JOHNSON Chief, Office of Health and Safety2 COAST GUARD WATER SUPPLY AND WASTEWATER DISPOSAL MANUAL CONTENTS CHAPTER 1: COAST GUARD WATER SUPPLY AFLOAT. Is the problem isolated in one section of the ship or does it occur throughout* If the problem affects only a particular section, concentrate the investigation on occurrences affecting the piping system or tank supplying that section.

Presuming water received from an external source or produced within the ship has been disinfected properly, the tanks contain an initial amount of chlorine or bromine.

Recent large-scale disease outbreaks involving drinking water systems and increased regulation are among the challenges inherent in water and wastewater systems and underscore the need for commands afloat and ashore to ensure compliance with this Manual. The tanks' or potable water system's lack of ability to maintain a halogen residual indicates the chlorine or bromine is reacting with some substance that may cause the taste or odor problem.

SCOPE: This manual applies to all active and reserve afloat and ashore commands. For afloat commands, water monitoring requirements found in Chapter 1 do not apply under the following condition: Vessel is moored and receives shore water from an approved municipal source which maintains a free available chlorine residual. While the causes of taste or odor problems vary widely, a systematic approach may resolve the problem or at least provide helpful initial data for more experienced investigators.4. These statements and questions represent a standardized approach to complaints received or experienced with taste or odor in the potable water supply.