RSEI Data Dictionary: Maximum Contaminant Level (MCL) Data
Tables in the RSEI Data Dictionary | |||||||
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Facility | Chemical | Submission | Category | Block Group Microdata | Population Data | ||
Offsite | MCL | Release | Disaggregated Microdata | Water Microdata | Shapefiles | ||
NAICS | Media | Elements | Aggregated Microdata | Census Crosswalks |
MCLs are used to cap maximum concentrations in drinking water systems.
MCL Data |
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Variable |
Description |
CASNumber |
Chemical Abstracts Service Registry Number, which identifies a unique chemical. For chemical categories, CAS Numbers begin with “N”, followed by three digits. |
CASStandard |
The Chemical Abstracts Service Registry Number identifies a unique chemical. The standard format contains three sets of numbers divided by hyphens (00-00-0). |
ChemicalNumber |
Unique internal identifier. |
Chemical |
Common name(s) of the chemical. |
MCL1988...MCL2016 |
MCL for each year an MCL was in effect. |