DMR Search Statistics Help

The Search Statistics table on the Water Pollution Search Results Page presents counts summarizing the facility universe applicable to your search. On this page:


DMR Search Statistics Definitions

Facility Counts (Based on Facility Data)

This universe is composed of all major and minor facilities found within ICIS-NPDES. Counts are affected by facility-level search criteria, which includes all criteria in the Location or Watershed, Industry, and Facility search boxes.

All Facilities
Count of unique facilities in ICIS-NPDES, regardless of available permit or discharge data.
Majors
Count of facilities classified as major discharges. Major municipal dischargers include all facilities with design flows of greater than one million gallons per day and facilities with EPA/State approved industrial pretreatment programs. Major industrial facilities are determined based on specific ratings criteria developed by EPA or state permitting authorities.
Minors
Count of 'non-major' facilities.
With Facility Info Only
Count of facilities without permit limit information in ICIS-NPDES. This universe of facilities is generally composed of non-major facilities for which EPA does not require authorized states to enter compliance and enforcement information into ICIS-NPDES. A portion of these facilities may also be major facilities.

Facility Counts (Based on Facility and Permit Data)

Counts of facilities reporting permit data during the selected calendar year. The counts are affected by pollutant-level search queries. For example, selecting "All Pollutants" would return all facilities with permit data for any pollutant. Specifying a pollutant or a pollutant category would restrict the universe of facilities to those with permit information for the selected pollutant or pollutant category.

Note that the facility counts do not include pollutants for which annual loadings cannot be calculated, such as temperature and pathogen indicators, unless those pollutant categories are selected for your search.

With Facility and Permit Data
Count of facilities with permit data returned by the search.
Majors
Count of major facilities with permit data. EPA expects authorized states to enter compliance and enforcement information into the national databases for at least 95% of their permitted facilities.
Minors
Count of "non-major" facilities with permit data. Permit data for non-major facilities varies across different state NPDES programs. Non-Major ("minor") facilities are not required to submit permit data to EPA. EPA is therefore not able to verify the accuracy or comparability of data for these permits, although the Agency tracks their names and locations and may have some data about their inspections and enforcement activity.
With Monitoring Requirements Only
Count of facilities with monitoring requirements specified in the permit.
With Monitoring Requirements and Effluent Limits
Count of facilities with monitoring requirements and effluent limits.

Facilities with Facility, Permit Data, and DMR Data in ICIS

This universe of facilities includes facilities with permit data and Discharge Monitoring Report (DMR) data in ICIS-NPDES. The count of facilities within this universe should generally match the count of facilities with permit data. However, non-major facilities are not required to report enforcement and compliance information to ICIS-NPDES, so minor facilities that have voluntarily submitted permit data may not be submitting DMR data.

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Search Statistics Behavior

The following equations characterize the expected behavior of the search statistics table for the DMR Loading Tool search. See the definitions of each term for more information.

  • "Based on Facility Data: Majors" + "Based on Facility Data: Minors" = "All Facilities"
  • "With Facility Info Only"+ "With Facility and Permit Data" = "All Facilities"
  • "Based on Facility and Permit Data: Majors" + "Based on Facility and Permit Data: Minors" = "With Facility and Permit Data"
  • "With Monitoring Requirements Only" + "With Monitoring Requirements and Effluent Limits" = "With Facility and Permit Data"
  • "Facilities with Facility, Permit Data, and DMR Data in ICIS" = "With Facility and Permit Data"

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Example Searches

Example 1: Select Reporting Year: 2016 and State: California

"All Facilities" returns the full universe of permitted facilities within California.

Screenshot indicating the All Facilities column of the Search Statistics table.

"Facility Counts (Based on Facility Data) - Majors/Minors" returns the full universe of permitted facilities grouped by major and minor permit designation. The sum of these two columns will be equal to "Facility Counts (Based on Facility Data) - All Facilities".

Screenshot indicating the All Facilities, Majors and Minors columns of the Search Statistics table.

"With Facility Info Only" returns the number of facilities without permit data. Since no specific pollutant or pollutant category was applied to this example search, the sum of "With Facility and Permit Data" and "With Facility Info Only" will equal "All Facilities".

Screenshot indicating the All Facilities, With Facility Info Only and With Facility and Permit Data columns of the Search Statistics table.

"If a pollutant, e.g., lead, is selected from the search criteria, "With Facility and Permit Data" counts only the facilities with permit information for lead. The sum of "With Facility Info Only" and "With Facility and Permit Data" will be less than "All Facilities". The difference indicates those facilities without permit information for lead."

Screenshot indicating the All Facilities, With Facility Info Only and With Facility and Permit Data

"Facility Counts (Based on Facility and Permit Data) - Majors/Minors" returns the full universe of facilities with permit information in ICIS-NPDES grouped by major and minor permit designation. The sum of these two columns will be equal to "With Facility and Permit Data"

Screenshot indicating With Facility and Permit Data, Majors and Minors columns of the Search Statistics table.

The sum of "With Monitoring Requirements Only" and "With Monitoring Requirements and Effluent Limits" will be equal to "With Facility and Permit Data"

Screenshot indicating With Facility and Permit Data, With Monitoring Requirements Only and With Monitoring Requirements and Effluent Limits columns of the Search Statistics table.

 

"Facilities with Facility, Permit Data, and DMR Data in ICIS" will be equal to or less than "With Facility and Permit Data"

Screenshot indicating With Facility and Permit Data and Facilities with Facility, Permit Data and DMR Data in ICIS column of the Search Statistics table.

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