| Water Quality Indicators Metadata | |
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Theme keywords: Drinking Water, SDWIS, Safe Drinking Water Information System, DBP, THM, HAA5, Arsenic, Nitrate, Community Water System, Disinfection Byproduct |
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Abstract:
This dataset contains measures of contaminants in community water systems (CWS) in relation to the size of the population served by the water system. For each community water system the file contains population served, mean and maximum concentrations of arsenic, disinfection by-products (HAA5, THM) and nitrate by quarter and by year. |
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This dataset contains measures of contaminants in community water systems (CWS) in relation to the size of the population served by the water system. For each community water system the file contains population served, mean and maximum concentrations of arsenic, disinfection by-products (HAA5, THM) and nitrate by quarter and by year.
The purpose of the Oregon EPHT Program is to provide scientific information from a web-based network of hazard, exposure, and health effect data to support actions that improve the health of communities. By bringing together, and standardizing, local, state, and national data sources of environmental and health information, scientists, policymakers, and the public will be able to more effectively address fundamental questions about relationships between environmental exposures and health effects. The Oregon EPHT Program is part of a National EPHT Network sponsored by the CDC. The Oregon EPHT Program resides in the Research & Education Section of the Office of Environmental Public Heath (OEPH) which is in the Public Health Division of the Oregon Health Authority.
The Oregon EPHT Program obtains drinking water data through an agreement with the Oregon Health Authority Drinking Water Program (DWP). Data are from the DWP Safe Drinking Water Information System (SDWIS).
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The principal county served variable designates the principal county which the water system serves; Multiple water systems can serve the same county and multiple counties can be served by a single water system. Principal county served is typically determined by the county in which the water system is situated. Community drinking water systems can serve areas substantially beyond the boundaries of the principal county served. Measures do not account for the variability in sampling, numbers of sampling repeats, etc. Furthermore, concentrations in drinking water cannot be directly converted to exposure, because water consumption varies by climate, level of physical activity, and between people.
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Estimates of the number of people served by community water systems are provided by water suppliers. These estimates may be inaccurate and of variable quality as they are based on the number of residential and commercial connections and an assumed average number of users per connection. Due to a limitation in the source database, estimates of the population served for the most recent year are also used for all prior years. This may result in an overestimation or underestimation of the population served in earlier years.
These data include records for community water systems that have 15 or more connections or provide year-round service to 25 or more persons. Data collected prior to 2002 were not included in this dataset, as data coverage was insufficient for the creation of meaningful summary statistics. The dataset includes only actual measurements; no values were imputed. The dataset contains one record for each active community water system per year. This means that systems that came online after the date of the extraction will be shown as have missing values until the time the system became active. There is no indication in the system to indicate if values are missing because the system was not in existence then or if a sample was not required during that time period.
Data were extracted from the Oregon Health Authority Drinking Water Program Safe Drinking Water Information System (SDWIS) Access database. SAS was used to aggregate data and create Nationally Consistent Data and Measures (NCDM) for the Environmental Public Health Tracking Network (EPHTN). For more information about Oregon Drinking Water see: http://www.oregon.gov/DHS/ph/dwp/index.shtml. For more information about Environmental Public Health Tracking NCDMs see: http://www.cdc.gov/nceh/tracking
800 NE Oregon Street, Suite 640
This dataset contains the following fields: Community Water System (CWS) Number, CWS Name, Year, Quarter, Principal County Served, Population Served, Mean Concentration, Maximum Concentration, Number of Samples.
Community water system number: two letter state abbreviation followed by 7 numbers. THM includes chloroform, bromodichloromethane, dibromochloromethane, and bromoform. HAA5 includes trichloroacetic acid, dichloroacetic acid, monochloroacetic acid, dibromoacetic acid, and monobromoacetic acid.
800 NE Oregon Street, Suite 640
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In preparation of this dataset, every effort has been made to offer the most current and correct information possible. Nevertheless, inadvertent errors in the data may occur. The EPHT program disclaims any responsibility for data errors and accuracy of the information that may be contained in the SDWIS database. EPHT also reserves the right to make changes at any time without notice.
800 NE Oregon Street, Suite 640
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