Occurrence Data
Accessing Unregulated Contaminant Monitoring Data

EPA uses the Unregulated Contaminant Monitoring Regulation (UCMR) to collect data for contaminants suspected to be present in drinking water, but do not have health-based standards set under the Safe Drinking Water Act (SDWA). The data assist the Administrator in determining whether or not to regulate those contaminants. Learn more about the UCMR.

• UCMR2 (2008-2010) Occurrence Data
• UCMR1 (2001-2005) Occurrence Data
• UCM-State Rounds 1 and 2 (1988-1997) Occurrence Data

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This set of data is not final. Monitoring is scheduled through December 2010; data will be added and may be corrected following further review. Please use caution in any interpretation of the subject data.

• UCMR2 Occurrence Data (1.9 MB ZIP File, April 2009)
• The ZIP FILE contains:
• UCMR2 Data Considerations, Definitions and Summary PDF
• UCMR2 Occurrence Data Text File

The following data is a subset of the above data organized by method classification.

• UCMR2 Occurrence Data by Method Classification (2.1 MB ZIP File, April 2009)
• The ZIP FILE contains:
• UCMR2 Data Considerations, Definitions and Summary PDF
• UCMR2 Occurrence Data by Method Classification Text Files

Some untreated source water data is included in these tables, but any positive result from source waters, which are subsequently treated, are not expected to be used to conduct exposure assessments. To the extent that positive results from monitoring source water that is subsequently treated are included in the table, these source water positive data are presented simply for informational purposes; in such cases, the results of additional finished water monitoring (at the entry point to the distribution system) were reported to EPA and appear in this table. Caution should be used in any interpretation of the subject data, since this table contains ALL data reported for UCMR1, including raw source water data.

• Description data contained in the UCMR PivotTable®
• UCMR1 List 1 and List 2 chemical monitoring data (2.75 M ZIP FILE) (Final January 2006)
• UCMR1 List 2 microbial (genus Aeromonas) monitoring data  (121 K ZIP FILE) (Final January 2006)
  • Aeromonas Information Sheet
• Accessing SDWIS/FED drinking water data in Excel PivotTables® (464 PDF FILE, 21pgs)
• UCMR1 data used in the May 2007 Preliminary Determinations for the second drinking water Contaminant Candidate List (CCL)

Data included in UCMR PivotTable®

This PivotTable contains information on UCMR sample results reviewed by EPA. Any or all of the following facts for a contaminant-

• # analyses performed
• # PWSs with analyses
• # PWSs with detects (analytical detections above the reporting limit)
• minimum detect
• maximum detect
• average detect

• EPA Region
• Geography type-state, tribal, territory
• State
• Primary county served
• Water system type
• Size category
• Primary source of water
• Owner type

- or any combination of the following sample attributes:

• Detects only or all analyses
• Minimum Reporting Level for an analytical method and contaminant
• Unit of measure
• Sample collection month and year
• Sample point type
• Sample analysis type
• Analytical method

Details on these attributes are provided in the PivotTable.

You can double-click on any data cell to obtain PWS-level and sample-level information.

UCM-State Rounds 1 and 2 (1988-1997) Occurance Data

• Description data contained in the Rounds 1 & 2 Pivot Tables
• Rounds 1 & 2 MS Excel PivotTables® (749 K zip file)
• Accessing SDWIS/FED drinking water data in Excel PivotTables® (21pp 207K PDF FILE)

Access Rounds 1 & 2 detailed data in text files

• Fields included in the Rounds 1 & 2 database      
• Rounds 1 & 2 database (51 MB zip file)

Data included in Rounds 1 & 2 PivotTable - This PivotTable contains information on Rounds 1 & 2 sample data. Any or all of the following facts for a contaminant-

• # analyses performed
• # PWS with analyses
• # detects
• # PWS with detects
• minimum detect
• maximum detect
• mean detect

• EPA Region
• State
• Water system type
• Size category *

• Which Round the sample is from *
• Whether the data was included in the national cross-section (which is a function of the State and the Round)
• Sample collection year *
• Source water type where the sample was taken *

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