PCE Concentration in Community Water Metadata
- metadata
- idinfo
- citation
- citeinfo
- origin: New Mexico EPHTN Project Manager
- pubdate: 20230718
- title: PCE Concentration in Community Water
- onlink
- descript
- abstract: These PCE (Tetrachloroethylene) drinking water quality sample data (typically, combined nitrate plus nitrite as nitrogen data) for New Mexico community water systems (CWS) contain the information needed to calculate Environmental Public Health Tracking (EPHT) annual drinking water quality mean and maximum concentration measures for each system or the for state by the number of CWS or the number of people served. The data are derived from New Mexico Safe Drinking Water Information System (SDWIS) database, 1999-2022. That dataset contains records for active CWS (active for the prior year at the time of extract from the state database, typically in February or March for the prior year’s sample data, e.g. March 2018 for the 2017 data). A CWS is a public water system that serves year-round residents of a community, subdivision, or mobile park that has at least 15 service connections or an average of at least 25 residents. These CWSs are a subset of all NM public water systems (PWS). Other water systems are not included. The number of CWS varies from year to year, by a few, typically 2-3. There have been 610 CWS active at one time or another and in 2022 there were 561 active CWSs.
The New Mexico Environment Department, Drinking Water Bureau, collects and maintains the original data.
- purpose: This dataset was created as part of the Environmental Public Health Tracking Network (EPHTN) drinking water quality measures. It is intended to provide researchers, public health professionals, and the public with summary information on PCE concentrations in community drinking water in New Mexico. The EPHT Content Workgroup Water Team identified initial contaminants of concern for the national EPHT program, identified nationally consistent data sources, and developed nationally consistent data and measures (NCDMs). This dataset can be used to calculate the nationally consistent measures for the New Mexico EPHT Program.
- supplinf: Treatment of non-detects: Sample results for PCE with concentrations less than the detection limit (but non-zero) have been replaced with a value equal to 0.5 the detection limit for the analytical method used. If a detection limit was not available from the SDWIS dataset or reported as zero, an estimate of the detection limit from available data and/or the analytical laboratory detection limit and/or a standard analytical method detection limit was applied. Missing data: The current format of the NCDMs annual dataset contains one record for annually and quarterly aggregated data and each compliance sample taken to test for PCE among active CWS for the years 1999-2022. If samples were not collected to test for PCE during a given year or quarter, there would be no record in the dataset. Consequently, when records are compiled for comparisons by CWSs, it may appear that the dataset has missing data. In order to mitigate the issue of "missing data" for cases when the data are in fact not missing, the carry forward procedure has been implemented. Under this procedure, if samples were not collected to test for PCE during a given year or quarter because the system (1) was not required to take a compliance sample during that particular period or (2) received a sampling waver from the state for reduced frequency of monitoring based on low analytical results, then the last year or quarter sampling result value was carried forward together with the year/quarter of the actual sample collection information. However, CWSs that have come online after the start date of the data extraction query will have missing values until the system became active. Thus, missing values may occur because the CWS was not yet active and currently these "missing values" are labeled "not sampled".
Drinking water wholesalers that have interties and sold their water to the CWS having a retail population were not included in the dataset even when SDWIS captured this information accurately and completely. Each importing CWS was attributed with wholesalers' applicable sampling results data. There are no other values missing for reasons beyond what the state's or EPA's monitoring framework and the structure of the EPHT NCDMs created.
- timeperd
- timeinfo
- rngdates
- begdate: 19990101
- begtime
- enddate: 20221231
- endtime
- current: Publication Date
- status
- progress: Complete
- update: Annually
- spdom
- bounding
- westbc: -109.05017700000001
- eastbc: -103.00206900000001
- northbc: 37.000292999999999
- southbc: 31.332173999999998
- keywords
- theme
- themekt: NONE
- themekey: PCE; Tetrachloroethylene; 2987; Environmental hazard; Environment; Water quality; Public water system; PWS; Community water system; CWS; ground water; State drinking water data set; National drinking water data set; Safe drinking water act; SDWA; safe drinking water information system; SDWIS; MCL; MCL violations; Maximum Contaminant Level;
- themekey
- themekey
- place
- placekt: FIPS 5-2 (State)
- placekey: NM, New Mexico, 35
- place
- placekt: FIPS 6-4 (County)
- placekey: New Mexico, NM, 35; 001 (Bernalillo), 003 (Catron), 005 (Chaves), 006 (Cibola), 007 (Colfax), 009 (Curry), 011 (De Baca), 013 (Dona Ana), 015 (Eddy), 017 (Grant), 019 (Guadalupe), 021 (Harding), 023 (Hidalgo), 025 (Lea), 027 (Lincoln),028 (Los Alamos), 029 (Luna), 031 (McKinley), 033 (Mora), 035 (Otero), 037 (Quay),039 (Rio Arriba), 041 (Roosevelt), 043 (Sandoval), 045 (San Juan), 047 (San Miguel), 049 (Santa Fe), 051 (Sierra), 053 (Socorro), 055 (Taos), 057 (Torrance), 059 (Union), 061 (Valencia)
- accconst: These data are publicly available; No permission required.
- useconst: These data may not be used to identify single problematic water systems. To identify regulatory or compliance issues with single water systems contact the NMED-DWB. The principal county served variable designates the principal county in which the CWS is located as reported by the supplier; however, community drinking water system distribution areas may extend beyond county boundaries. Use of the principal county served variable to link drinking water data to health outcomes or other data should be made only with extreme precautions, after the implications of doing so are completely understood, and with fully and explicitly stating the limitations of the linkage. These data are aggregate summary-level water PCE concentrations in finished water. They reflect the potential for population exposure but are not true exposure estimates; therefore they should not be used directly in any epidemiologic investigations of health outcome and environmental linkages. These data may not be used to identify any individual or residence who is receiving drinking water.
No responsibility is assumed by the NM Department of Health (NMDOH) related to data and materials or how these data are represented by those who access this information. All users must read and fully comprehend metadata prior to data use.
- ptcontac
- cntinfo
- cntperp
- cntper: New Mexico EPHTN Project Manager
- cntorg: New Mexico Department of Health, Environmental Health Epidemiology Bureau
- cntpos
- cntaddr
- addrtype: Physical
- address: 1190 St. Francis Drive
- city: Santa Fe
- state: NM
- postal: 87505
- country: United States Of America
- cntvoice: 18888788992
- cntvoice
- cnttdd
- cntfax: 5058272110
- cntemail: DOH-EHEB@state.nm.us
- hours: 8:00 - 5:00
- cntinst
- secinfo
- secsys: NONE
- secclass: Unclassified
- sechandl: NONE
- native: SAS 9.4, water_pws_ann.sas7bdat
- dataqual
- logic: NONE
- complete: These data are complete with respect to CDC's NCDM requirements. This dataset contains only regulated community water systems, which were active at the time of the data extraction date from the state SDWIS database (typically in February or March for the prior year’s sample data, e.g. March 2018 for the 2017 data). All CWSs taking compliance samples from January 1, 1999-December 31, 2022 are included in the dataset. Compliance samples collected by drinking water wholesalers that have interties with and sold to the CWS having a retail population are not included within each importing CWS applicable sampling results data, even when SDWIS captured this information accurately and completely. Each importing CWS is attributed with wholesalers' applicable sampling results data. Private, transient, and non-community water systems are not included in this dataset. PCE data are typically collected, however, when the analytical results exceed the 5 mcg/L MCL a confirmatory sample would provide separate results for PCE [analyte code #2987]). Estimates of the number of people potentially exposed may be unreliable as they are based on estimates made by the water system operator. Concentrations in drinking water cannot be directly converted to exposure, because overall water consumption and the proportion of water consumed that comes from the tap are quite variable. In systems that have more than one entry point to the distribution system, the actual PCE level at any given house is a mixture of the levels from all contributing sources. This mix is unknown in these circumstances. In addition, PCE in drinking water is often not the sole source of dietary PCE intake, and may be a minor component. See Supplemental Information for treatment of non-detects.
Estimates of the number of people potentially exposed may be unreliable as they are based on estimates made by the water system operator. Concentrations in drinking water cannot be directly converted to exposure, because overall water consumption and the proportion of water consumed that comes from the tap are quite variable. In systems that have more than one entry point to the distribution system, the actual nitrate level at any given house is a mixture of the levels from all contributing sources. This mix is unknown in these circumstances.
- lineage
- procstep
- procdesc: This dataset was created by extracting data for non-transient community water systems in NM, which were active for the entire year 1999 through 2022 or portion therein. A CWS is a public water system that serves year-round residents of a community, subdivision, or mobile home park that has at least 15 service connections or an average of at least 25 residents. Sample results are limited to samples taken between January 1, 1999 and December 31, 2022. The dataset accommodates summary-level measures of water PCE concentrations. This dataset has a finite number of columns and incorporates a hierarchical data structure. This dataset contains information on CWSs representing all 33 NM counties. The data extracted from NM SDWIS were processed using the Centers for Disease Control and Prevention (CDC) Drinking Water Quality Nationally Consistent Data and Measures (NCDMs) How-To Guide within the Environmental Public Health Tracking Network, version 2, January 19, 2022.
- procdate: 20230718
- procstep
- procdesc: NM EPHT receives drinking water system data for community water systems (CWS) from the NM Environment Department Safe Drinking Water Information System (SDWIS). Data are received in MS Excel spreadsheets, with location coordinates in four different datums for CWS business address: three geographic and one unknown. Populated place locations are captured, where possible, with a matching merge with 2018 version of USGS Geographic Names Information (NAD83) by feature name.
- procdate: 20230718
- procstep
- procdesc: NMEPHT data queried through nmtracking.org (NMTracking) result in query-specific data sets that are community water system specific or statewide.
- procdate: 20230718
- eainfo
- overview
- eaover: The dataset contains annual average and maximum and the mean concentration per quarter for PCE for the years 1999-2022. The fields in the dataset are: PWSIDNumber, TimePeriod, Analyte (PCE, Tetrachloroethylene), AggregationType (mean or maximum), Concentration, and ConcentrationUnits. The dataset also contains fields describing Community Water Systems (CWS) derived from an inventory file of CWS qualifying Public Water Sytems such as number of connections and approximate number of people served.
- eadetcit: Data dictionary (last revised: January 19, 2022) is available by contacting the NM EPHT Program at http://nmtracking.org or DOH-EHEB@state.nm.us
- distinfo
- distrib
- cntinfo
- cntperp
- cntper: New Mexico EPHTN Project Manager
- cntorg: New Mexico Department of Health, Environmental Health Epidemiology Bureau
- cntpos
- cntaddr
- addrtype: Physical
- address: 1190 St. Francis Drive
- city: Santa Fe
- state: NM
- postal: 87502
- country: United States Of America
- cntvoice: 18888788992
- cntvoice
- cnttdd
- cntfax: 5058272110
- cntemail: DOH-EHEB@state.nm.us
- hours: 8:00 - 5:00
- cntinst
- resdesc: PCE_CommunityWater (.xml).
- distliab: In preparation of data, every effort has been made to offer the most current and correct data possible. Nevertheless, inadvertent errors in data may occur, specifically as far as the prior to 2005 data are concerned. The EPHTN disclaims any responsibility for data errors and accuracy of the information that may be contained within the SDWIS database. The EPHTN also reserves the right to make changes at any time without notice.
- custom: Distributed through the NM Environmental Public Health Tracking Network (NMEPHTN). The full dataset can be obtained by contacting the distributor listed in the contacts section. All users must read and fully comprehend metadata prior to data use.
- metainfo
- metd: 20230718
- metc
- cntinfo
- cntperp
- cntper: New Mexico EPHTN Project Manager
- cntorg: New Mexico Department of Health, Environmental Health Epidemiology Bureau
- cntpos
- cntaddr
- addrtype: Physical
- address: 1190 St. Francis Drive
- city: Santa Fe
- state: NM
- postal: 87505
- country: United States of America
- cntvoice: 18888788992
- cntvoice
- cnttdd
- cntfax: 5058272110
- cntemail: DOH-EHEB@state.nm.us
- hours: 8:00 - 5:00
- cntinst
- metstdn: EPHTN Tracking Network Profile Version 3
- metac: NONE
- metuc: This information is provided by the Environmental Health Epidemiology Bureau (EHEB) of the New Mexico Department of Health. All users must read and fully comprehend metadata prior to data use.
