2009-2010 Drinking Water-associated Outbreak Surveillance Report: Supplemental Tables

These tables provide supplemental information not published in Surveillance for Waterborne Disease Outbreaks Associated with Drinking Water and Other Nonrecreational Water — United States, 2009–2010 (MMWR Weekly).

Waterborne Disease Outbreaks Associated with Drinking Water (N = 33) and Other Non-Recreational Water* (N = 12) by Year and State/Jurisdiction — Waterborne Disease and Outbreak Surveillance System, United States, 2009-2010.

Line list expanded to include class and deficiency.

Abbreviations: AGI = acute gastrointestinal illness; ARI = acute respiratory illness; Hep = Hepatitis; Other = undefined, illnesses, conditions, or symptoms or symptoms that cannot be categorized as gastrointestinal, respiratory, ear-related, eye-related, skin-related, neurological, hepatitis or caused by leptospirosis.

*Non-recreational waterborne disease outbreaks combines two previously-reported categories, ‘Water Not Intended for Drinking’ and ‘Water of Unknown Intent.’ It includes outbreaks not associated with public or private drinking water systems, as well as outbreaks for which the intended use of the water is not known. It does not include outbreaks associated with recreational water venues (e.g., swimming pools), which are reported separately.

† On the basis of epidemiologic, clinical laboratory, and environmental data (e.g., water quality data) provided to CDC.

§ The category of illness reported by ≥50% of ill respondents. All legionellosis outbreaks were categorized as ARI.

¶ Value was set to missing in reports where zero hospitalizations were reported and the number of people for whom information was available was also zero.

** Value was set to missing in reports where zero deaths were reported and the number of people for whom information was available was also zero.

†† Community and noncommunity water systems are public water systems that have ≥15 service connections or serve an average of ≥ 25 residents for ≥ 60 days/year. A community water system serves year-round residents of a community, subdivision, or mobile home park. A noncommunity water system serves an institution, industry, camp, park, hotel, or business and can be nontransient or transient. Nontransient systems serve ≥ 25 of the same persons for >6 months of the year but not year-round (e.g., factories and schools) whereas transient systems provide water to places in which persons do not remain for long periods of time (e.g., restaurants, highway rest stations, and parks). Individual water systems are small systems not owned or operated by a water utility that have <15 connections or serve <25 persons.

§§ Deficiency classification assigned to outbreaks associated with drinking water, other water, and unknown water exposures

¶¶ A cross-connection between potable and nonpotable water sources resulting in backflow was a suspected or confirmed factor in this outbreak.

*** Etiology unidentified: contamination of water with sodium hydroxide suspected based upon incubation period, symptoms, outbreak investigation and laboratory findings.

††† The other symptoms reported were chemical esophagitis and burns in mouth.

§§§ Facility had an onsite disinfection system that was not operational at the time of the outbreak.

¶¶¶ Setting was a recreational facility with multiple buildings. A private well that was originally used for a residence was reclassified as a community water system as a result of the outbreak investigation.

**** The facility had an onsite chlorine dioxide system; however, there were indicators that the system was not being monitored properly at the time of the outbreak.

†††† The facility had an onsite chlorine dioxide system and was being monitored for Legionella.

§§§§ Reported contributing factors included a temporary disruption in disinfection and a cross-connection between potable and nonpotable water sources resulting in backflow.

¶¶¶¶ Multiple water sources within the facility were identified as possible exposures in this outbreak.

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Number of Waterborne Disease Outbreaks, by Drinking Water System and Source — Waterborne Disease and Outbreak Surveillance System, United States, 2009-2010.

Drinking Water-associated Outbreaks by Etiology Group, 2009-2010

Community Water Systems

Non-community Water Systems*

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Individual Water Systems*

Commercially-bottled Water*

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