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Maximum contaminant level goal (MCLG) vs. reference dose (RfD)?

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EPA Exposure Research - Using Regional Exposure Criteria and Upstream Reference Data to Characterize Spatial and Temporal Exposures to Chemical Contaminants10-22-2007
Two types of references were used for comparison, an upstream reference sample remote from known point sources and regional exposure criteria derived from a baseline of fish from reference sites throughout Ohio, USA ...
http://cfpub.epa.gov/ordpubs/nerlpubs/recordisplay.cfm?deid=96105 (HTML)
EPA's STORET Bacteria Monitoring Stations and Data Summaries for CONUS10-16-2009
Attribute_Definition: Indicates the upper reference level... Attribute_Definition: Indicates the lower reference level... Attribute_Definition: Indicates the reference level source.
http://www.epa.gov/waterscience/BASINS/metadata/bac.htm (HTML)
Urinary Phthalate Level | Report on the Environment Database | US EPA01-09-2010
... Contaminants ' Indicators, however, the information on these pages (overview, graphics, references and metadata) relates specifically to "Urinary Phthalate Level... Generally recognized reference levels for phthalate metabolites in urine have not been established.
http://cfpub.epa.gov/eroe/index.cfm?fuseaction=detail.viewInd%26lv=lis... (HTML)
Urinary Phthalate Level | Report on the Environment Database | US EPA12-11-2009
... Contaminants ' Indicators, however, the information on these pages (overview, graphics, references and metadata) relates specifically to "Urinary Phthalate Level... Generally recognized reference levels for phthalate metabolites in urine have not been established.
http://cfpub.epa.gov/eroe/index.cfm?fuseaction=detail.viewInd%26showQu... (HTML)
Urinary Phthalate Level | Report on the Environment Database | US EPA12-11-2009
... Contaminants ' Indicators, however, the information on these pages (overview, graphics, references and metadata) relates specifically to "Urinary Phthalate Level... Generally recognized reference levels for phthalate metabolites in urine have not been established.
http://cfpub.epa.gov/eroe/index.cfm?fuseaction=detail.viewInd%26showQu... (HTML)
Urinary Phthalate Level | Report on the Environment Database | US EPA12-10-2009
... Contaminants ' Indicators, however, the information on these pages (overview, graphics, references and metadata) relates specifically to "Urinary Phthalate Level... Generally recognized reference levels for phthalate metabolites in urine have not been established.
http://cfpub.epa.gov/eroe/index.cfm?fuseaction=detail.viewInd%26showQu... (HTML)
Urinary Phthalate Level | Report on the Environment Database | US EPA12-10-2009
... Contaminants ' Indicators, however, the information on these pages (overview, graphics, references and metadata) relates specifically to "Urinary Phthalate Level... Generally recognized reference levels for phthalate metabolites in urine have not been established.
http://cfpub.epa.gov/eroe/index.cfm?fuseaction=detail.viewInd%26showQu... (HTML)
Urinary Phthalate Level | Report on the Environment Database | US EPA12-10-2009
... Contaminants ' Indicators, however, the information on these pages (overview, graphics, references and metadata) relates specifically to "Urinary Phthalate Level... Generally recognized reference levels for phthalate metabolites in urine have not been established.
http://cfpub.epa.gov/eroe/index.cfm?fuseaction=detail.viewInd%26showQu... (HTML)
Urinary Phthalate Level | Report on the Environment Database | US EPA12-10-2009
... Contaminants ' Indicators, however, the information on these pages (overview, graphics, references and metadata) relates specifically to "Urinary Phthalate Level... Generally recognized reference levels for phthalate metabolites in urine have not been established.
http://cfpub.epa.gov/eroe/index.cfm?fuseaction=detail.viewInd%26showQu... (HTML)
Urinary Phthalate Level | Report on the Environment Database | US EPA12-10-2009
... Contaminants ' Indicators, however, the information on these pages (overview, graphics, references and metadata) relates specifically to "Urinary Phthalate Level... Generally recognized reference levels for phthalate metabolites in urine have not been established.
http://cfpub.epa.gov/eroe/index.cfm?fuseaction=detail.viewInd%26showQu... (HTML)

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