0920-1175 Data Dictionary – Drinking Water (Community Monitoring)

Data Dictionary – Drinking Water 7

CDC estimates the average public reporting burden for this collection of information as 50 hours per response, including the time for reviewing instructions, searching existing data/information sources, gathering and maintaining the data/information needed, and completing and reviewing the collection of information. An agency may not conduct or sponsor, and a person is not required to respond to a collection of information unless it displays a currently valid OMB control number. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to CDC/ATSDR Information Collection Review Office, 1600 Clifton Road NE, MS HS 21-8, Atlanta, Georgia 30333; ATTN: PRA (0920-1175).

Form Approved OMB No. 0920-1175 Exp. Date 07/31/2023 Data Dictionary – Drinking Water
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Purpose and Use of this Document

This data set contributes to the Environmental Public Health Tracking Network. The EPHT cooperative agreement states that “by September 30, 2008 […all grantees must] track and make available core environmental health tracking measures on the State and National EPHT Network […including …] data/information on key water contaminants, as defined through the Content workgroup process.” The Content Workgroup Water Team identified initial contaminants of concern for the national EPHT program, identified nationally consistent data sources, and developed nationally consistent indicators and measures. This data set can be used to calculate the nationally consistent measures for the initial contaminants of concern.

This data set contains the information needed to calculate Environmental Public Health Tracking (EPHT) measures of contaminants in public water supply for arsenic, disinfection byproducts, nitrates, atrazine, di(2-ethylhexyl) phthalate (DEHP), radium, tetrachloroethene (tetrachloroethylene) (PCE), trichloroethene (trichloroethylene (TCE), and uranium. Data are derived from state Safe Drinking Water Act databases. The data set consists of two tables:

1. PWS Inventory. This file is required and contains descriptive and locational information about each public water system (PWS) with which water quality data is provided. This dataset should only include Community Water Systems (CWS) as defined and regulated by the Safe Drinking Water Act. It does not include Non-Transient Non-Community (NTNC) and Transient Non-Community water systems (TNC). There is one record for every year that a CWS was active, delivering drinking water to customers, and in which water quality data is complete. CWS that were once active and are currently inactive should be included if State's data support this scenario.

2. Drinking Water Quality Sampling Results. This file is required and contains one record for each community water system (CWS) for the mean and maximum concentrations per year of each of arsenic, disinfection byproducts (HAA5 and TTHM), nitrates, atrazine, di(2-ethylhexyl) phthalate (DEHP), radium, tetrachloroethene (tetrachloroethylene) (PCE), trichloroethene (trichloroethylene) (TCE), and uranium; and the mean concentrations per quarter of disinfection byproducts, nitrates and atrazine.

Version History V.18.1

18.0 This version has been updated to remove three sample level variables and any mention of sample level data throughout the document.

18.1 this version has added new analytes lead, PFOS and PFOA

Field Name	Description
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Data Dictionary

PWS Inventory (all variables are required)

Field Name/Schema Name	Field Description	Format	Allowed Values
StateFIPSCode	State FIPS code	AN(2)	FIPS State Code
PWSIDNumber	PWS identifier	AN(9)	nine-character value consisting of the 2-letter state abbreviation followed by 7 numbers
YearAssociatedTo	Year data are associated to with regards to sampling results	Text(4)	YYYY. 1999 through latest complete year (e.g., 2021)
YearPulled	Year that these data were pulled from state records	Text(4)	YYYY. 1999 through latest year.
PWSName	Name of PWS	AN(40)	Any; “U” = Unknown; “NS” = Not submitted
PrincipalCountyServed FIPS	Principal county FIPS served by the CWS	AN(5)	Any; “U” = Unknown; “NS” = Not submitted
PrincipalCityFeatureID	Principal city, town or village Feature ID served by the CWS	N(10)	9999999999;”-999” for Missing; “-888” for Not Submitted Feature ID can be obtained from: http://geonames.usgs.gov/domestic/download_data.htm
TotalConnections	Number of residential service connections	N(7)	1-9999999”
SystemPopulation	Permanent population uniquely served by the CWS	N(8)	10-99999999 ”
PrimarySourceCode	Type of water source	AN(3)	GU = ground water under direct influence of surface water, GUP = purchased ground water under direct influence of surface water, GW = ground water, GWP = purchased ground water, SW = surface water, SWP = purchased surface water; “U” = Unknown; “NS” = Not submitted
Latitude	Latitude in NAD83 decimal degrees describing approximate center of retail service area of water system	N(10)	00.0000000 to 90.000000;”-99.99” for Missing; “-88.88” for Not Submitted.
Longitude	Longitude in NAD83 decimal degrees describing approximate center of retail service area of water system	N(11)	-180.000000 to 180.000000;”-999” for Missing; “-888” for Not Submitted.
LocationDerivationCode	Code describing how approximate latitude/longitude location was derived	AN(3)	SA = Service area polygon centroid; MFL = Mean of 1 or more facility locations that are expected to be proximate to service area extent; PCS = GNIS coordinates for Principal City Served; GSH = The geocoded address of water system headquarters; PNS - GNIS coordinates for Principal County Served; O= Other (e.g., zip code, etc.) “-999” = Missing; “-888” = Not Submitted; (See “Appendix A. Service Area Location Derivation Guidance of the How-To Guide” on EPHTN Share Point site for more information & guidance for deriving water system locations.)

Drinking Water Quality Sampling Results

Field Name/Schema Name	Field Description	Format	Allowed Values	Required (Y/N)
PWSIDNumber	PWS identifier	AN(9)	Nine-character value consisting of the 2-letter state abbreviation followed by 7 numbers	Y
StateFIPSCode	State FIPS code	AN(2)	FIPS State Code	Y
Year	Year	Text(4)	YYYY; 1999 through latest complete year (e.g., 2011)	Y
AnalyteCode	USEPA Analyte code for required constituents (arsenic, nitrate, TTHM, HAA5, atrazine, PCE, TCE, DEHP, radium, uranium, lead, PFOS, PFOA).	N(4)	1005=Arsenic 2050=Atrazine 2456=HAA5 2950=TTHM 2039=DEHP 1040=Nitrate 2987=PCE 2984=TCE 4010=Combined Radium 226 & 228 4006=Uranium (see How-To-Guide for converting gross alpha particle activity to U in ug/L) 1030=Lead 2805=PFOS 2806=PFOA	Y
ConcentrationUnits	The analyte-specific units of summary-level measures as reported in the Concentration field. Each analyte has a standard unit for this dataset.	AN(6)	“ug/L” allowed only for (Arsenic, TTHM, HAA5, Atrazine, DEHP, PCE,TCE, uranium, lead, PFOS, PFOA); “mg/L” allowed only for (Nitrate as nitrogen); “pCi/L” allowed only for (Radium)	Y
Concentration	Reported summary-level concentration	6.4	>0 for summary-level measure	Y
DateSampled	Date last sampled (summary-level data)	YYYY-MM-DD	A valid date from 1/1/1999 through December 31st of the latest complete year (e.g., 2011-12-31).	Y
AggregationType	Type of summary operation performed (i.e., mean or max) for summary-level data.	AN(3)	“X” = Mean (for Annual and Quarterly data); “MX” = Maximum (For Annual Data ONLY; DO NOT SUBMIT FOR QUARTERLY DATA 90X = annual 90th percentile	Y
NumSamplingLocations	Number of compliance sampling locations from which summary-level records were derived.	N(4)	1-9999; “-888” for Not Submitted	Y
SummaryTimePeriod	Year or Quarter for summary-level data	AN(10)	YYYY for annual summarized values; YYYY-Q for quarterly summarized values Allowed Only for Analyte Codes 2050, 2456, 2950 and 1040	Y
NumSamples	Number of samples used in calculating the mean/max/90th percentile for a given analyte during a quarter or year.	N(4)	1-XXXX	Y
NumNonDetects	The number of samples that were non-detections for summary-level data.	N(4)	0-XXXX (XXXX must be no greater than NumSamples)	Y

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