In July, 2003 EPA announced the review results for the Agency’s first Six-Year Review (called the Six-Year Review 1). EPA completed its first detailed contaminant occurrence analyses in 2003 for 69 regulated contaminants, using data provided by a national cross-section of 16 states. Most of the sample data were collected between 1993 and 1997.

Six-Year Review 1 Contaminant Occurrence Data

The Six-Year Review 1 MS Excel PivotTables® below contain summary occurrence data used in developing the first Six-Year Review of national primary drinking water regulations. Download the tables by selecting the link below:

Six-Year Review 1 Occurrence Data Pivot Table(2 pp, 5 MB, September 2002)

Data included in the Six-Year Review 1 PivotTable

This PivotTable contains information on Six-Year Review 1 sample data including:

• # analyses performed
• # PWSs with analyses
• # detects
• # PWSs with detects (analytical detections above the reporting limit)
• minimum detect
• maximum detect
• mean detect
• minimum non-zero MRL
• maximum MRL
• mean non-zero MRL

Any or all of the above facts for a contaminant can be categorized by any combination of the following water system attributes:

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

-or any combination of the following sample attributes:

• Sample collection year *
• Source water type where the sample was taken *

* To avoid double-counting, the Pivot Tables will not sum the number of PWSs with and without detects across this dimension/attribute. Details on these attributes are provided in the Pivot Tables.