What is a DMR?

Discharge Monitoring Report

A common requirement of a MPDES permit is regular self-monitoring of permitted parameters. The results of this regular self-monitoring are submitted to the regulating agency (DEQ Water Protection Bureau) on a DMR form. The preprinted DMR form is a reflection of the monitoring locations, limits, and monitoring requirements of the current MPDES permit. Each discharge point and monitoring location will have a separate DMR form for each monitoring period.

Click on specific fields of this example DMR for a description and instruction.

Blank DMR

Instructions

For additional instruction, link to the following documents or contact the Water Protection Bureau at (406) 444-3080.

Permittee Name/Address

The Water Protection Bureau mails pre-printed DMRs to permittees for an entire calendar year, with this information already included on your DMR. If a pre-printed DMR is not available to you, you may contact the Water Protection Bureau at (406) 444-3080 or use a blank DMR form, filling in all information. However, if you use a blank DMR form, you are responsible for ensuring that all parameters are correctly sampled and reported as required by your permit. If the information on your pre-printed DMR is incorrect, submit the correct information on a cover letter, signed by a registered agent/authority, with the DMRs.

Facility Location

If your DMR is not pre-printed, please enter the location of the permitted facility/site if it is different than the mailing address.

Attention Line (ATTN:)

The DMR Cognizant Official or the name and/or department of the permittee's representative responsible for completing Discharge Monitoring Reports (DMR), also referred to as the Facility Contact Person.

Permit Number

Your facility's unique permit number, as it appears on the first page of your permit for individual MPDES and MGWPCS permits, or on your Confirmation Letter for authorizations under a General Permit. All correspondence regarding any issues at the facility, including DMR and report submissions, must prominently display the permit number.

Discharge Number

This is referred to as your Outfall number in your permit. If your DMR is pre-printed, this information will already be included on your DMR. The Water Protection Bureau mails DMRs to permittees for an entire calendar year. A separate DMR form has been printed for each monitoring period and for each Discharge Number (outfall/pipe) or permitted feature. Verify that you are reporting the correct measurement information on the correct Discharge Number DMR for the correct monitoring period. A narrative description of the discharge number also appears in the top right corner of the DMR. For individual permits, your permit (typically page 6) will include a description of your Outfalls. For authorizations under a General Permit, this information is located on your Confirmation Letter. Some of the most common numbers are as follows:

  • 001-A: This is typically the primary discharge point from the facility. Additional outfalls will be numbered 002-A, 003-A, 001-B, etc.
  • 001-Q: A "Q" typically indicates quarterly monitoring, an "S" indicates semi-annual monitoring, and a "Y" indicates yearly/annual monitoring.
  • 001-W: A "W" is used on the DMRs for Whole Effluent Toxicity testing. For more information, link to the EPA's Whole Effluent Toxicity page.
  • MW-1: This is typically used to indicate a Monitoring Well. Additional monitoring wells will be numbered MW2, MW3, etc.

Additional Characters may also be used. If you have any questions, please contact the Water Protection Bureau (WPB)at (406) 444-3080.

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Monitoring Period

This lists the first day of the monitoring period through the last day of the monitoring period. This is typically a calendar month or a calendar quarter formatted as MM/DD/YYYY.The two digit month is followed by the two digit day and the four digit year. Previous DMR versions show the date formatted as YY/MM/DD, with the two digit year, month and day in three separate boxes. This information will already be included on pre-printed DMRs. The Water Protection Bureau mails DMRs to permittees for an entire calendar year. A separate DMR form has been printed for each monitoring period and for each Discharge Number (outfall/pipe) or permitted feature. Verify that you are reporting the correct measurement information on the correct discharge number DMR for the correct monitoring period.

DMR Mailing Zip Code

The Zip Code to which the DMR is mailed. If the Facility Location differs from the Permittee Name/Address, the DMR Mailing Zip Code will be the same as the Permittee Name/Address.

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No Discharge

If you did not have a discharge or flow from your facility for a specific outfall during the monitoring period, "No Discharge" must be indicated on the DMR. You may indicate no discharge by either checking this box or writing "No Discharge" clearly across the DMR. You must not sign or submit the DMR before the end of the reporting period. A DMR must be submitted with the proper signatures for each outfall for each monitoring period, even if there was no discharge or activity during the monitoring period. If "No Discharge" is indicated, no other data is expected in the blank white boxes of this DMR form.

"No Discharge" on a Groundwater Monitoring Well is not a valid reporting. Groundwater Monitoring Wells must be sampled even if there is no discharge at the permitted outfalls.

Parameter

The constituent that is being sampled, such as Total Suspended Solids (TSS). This column on the far left of the DMR is for listing all parameters that you are required by your permit to sample. If your DMR is pre-printed, this information will already be included on your DMR. Each box will display the parameter name, followed by a numeric code. Be sure to report the results for each parameter in the correct row. Please pay particular attention to the narrative description of the sampling location that appears on the bottom of the parameter block. Multiple monitoring locations may appear for the same parameter on the same DMR form.

Seasonal discharge numbers or permitted features and seasonal parameters are only included on the DMRs for the monitoring periods stipulated in your permit. Parameters or entire discharge numbers or permitted features that must be reported less frequently than monthly (i.e. quarterly, semi-annually, etc.) will be included in the DMRs for the last month of the reporting period. For example, unless otherwise specified in the permit, reporting for the January through March reporting quarter must be included on the March DMR. However, sampling for these parameters may be performed any time during the reporting period, unless otherwise specified in your permit.

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Quantity or Loading

The information contained in these columns are usually a mass calculation of kilograms/day or pounds/day, and/or total calculations for flow and precipitation. The units in which this data must be reported are specified in the shaded boxes of the Units column under this heading.

Quality or Concentration

The information contained in this column is usually a concentration calculation such as milligrams/liter (mg/L) or micrograms/liter (ug/L). Some values to be reported in this column are not true concentration values, such as flow in million gallons per day (mgd). The units in which this data must be reported are specified in the shaded boxes of the Units column under this heading.

Value

The actual value or calculation to be reported. Enter your information in the white boxes. If your DMR is pre-printed, a group of asterisks (******) will be placed in the boxes that you are not required to complete. All other white boxes must be completed (exception, see No Discharge).

Reporting for all parameters as specified in your permit are required to be sampled or calculated and submitted on/with the DMR, even if they do not appear on the pre-printed DMR. If you feel there is an error in your DMR, contact the Water Protection Bureau at (406) 444-3080.

For assistance on calculating values or converting units, see Instructions.

Units

There are two columns for the units. The first is after the "Quantity or Loading," the next is after "Quality or Concentration." If your DMR is pre-printed, this information will already be included on your DMR. You must report your results in the same units as stated on the DMR. Some common units are million gallons per day (MGD), milligrams per liter (mg/L) standard units (s.u. - used for pH), and number present in 100 milliliters of sample (no./100 mL). Be sure to use this column only for the units of the parameter. The actual values must be reported in the white Values boxes.

For assistance on calculating values or converting units, see Instructions.

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Sample Measurement Row

This is where you summarize the measurement data for each parameter, including:

Enter your information in the white boxes. If your DMR is pre-printed, a group of asterisks (******) will be placed in the boxes that you are not required to complete. All other white boxes must be completed (exception, see No Discharge).

Reporting for all parameters as specified in your permit are required to be sampled or calculated and submitted on/with the DMR, even if they do not appear on the pre-printed DMR. If you feel there is an error in your DMR, contact the Water Protection Bureau at (406) 444-3080.

The monitoring frequencies specified in your permit and included in the Permit Requirement row are minimum monitoring requirements. The results of any additional monitoring of parameters at location(s) designated in the permit, using approved sampling procedures and analytical methods, must be included in the DMR calculations. Such increases in the frequency of sampling shall also be reported in the Frequency of Analysis block.

The detection limit of the analytical method used to generate the reported Sample Measurements must be equal to, or less than, the minimum level for that parameter in your permit. If a minimum level for the parameter is not specified in your permit, the detection limit of the analytical method used to generate the Sample Measurement values must be equal to, or less than, the permit limit.

If measurement information is not available for a specific Discharge Number or parameter, please do not leave blank spaces on the DMR. Under these circumstances, please use the appropriate "No Data Indicator" (NODI) code. Any blanks appearing on your DMR may be non-reporting violations for which you may be subject to an enforcement action. A narrative explanation of any "No Data Indicator" codes must accompany the DMR submission.

It may be necessary to do calculations to convert your data to the reporting requirements outlined in your permit. Guidance documents and tools can be found at the top of this page and on the Self Monitoring and DMR Assistance page.

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Permit Requirement Row

If your DMR is pre-printed, the effluent limits for each parameter and a description of the statistical basis (i.e. minimum monthly, average monthly, maximum daily, minimum daily, etc.) of the reporting requirement are displayed in this row of the DMR under "Quantity or Loading" and/or "Quality or Concentration." The permit requirements for Units, Frequency of Analysis and Sample Type are also displayed.

If the parameter is not limited, but monitoring is required, the DMR lists the word "Report" followed by a narrative description of the statistical basis on which the information must be reported. If no information is required, a group of asterisks (******) and no statistical basis code will be printed in the Permit Requirement row. The DMR must reflect the most current monitoring and reporting requirements. If you feel there is an error in your DMR, contact the Water Protection Bureau (WPB) at (406) 444-3080.

No. Ex.

Number of Exceedances. This column is used to record the number of Sample Measurement Values (total of loading and concentration) that exceeded the permit limit for each parameter. In the case of a maximum or minimum limit, each analysis that violates this limit shall be counted. In the case of an average (7-day or 30-day average) limit, each average in excess of the limit should be counted. If all samples are measured at, or below, the permit level, enter "0" (zero) on the DMR.

Frequency of Analysis

You must report in this column the actual frequency of your analyses during the reporting period. This frequency must be at least the minimum required by your permit. If your DMR is pre-printed, the minimum sampling required by your permit is listed in the shaded boxes under each white box. For example, enter "CONT" for continuous monitoring, "01/07" for one day per week, "01/30" for one day per month, "01/90" for one day per quarter.

Sample Type

You must report the actual sample type used during the monitoring period. If your DMR is pre-printed, the sample type required by your permit is listed in the shaded box under each white box. Use the word or words that most accurately represent the actual sample type.

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Name/Title Principal Executive Officer

The name and title of the responsible person should be printed at the bottom of the form. This person should sign and date the form on the Signature section. See your permit for information on who may sign the DMRs.

Certification Statement

It is very important that you read and understand this certification statement. By signing the DMR, you are certifying to Montana DEQ, under penalty of law, that the information on the DMR is true and accurate.

Signature

Every page of the DMR must be signed by the authorized Principal Executive Officer or Authorized Agent. See your permit for information on who may sign the DMRs.

In the event a revised or corrected DMR is necessary, an original authorized signature and the date of the signature is required on each page. The word "Revised" should be clearly visible on each page of the form.

Retain a copy of the submitted DMR for your facility records. The original DMR must be submitted to the Water Protection Bureau at the following address:

Montana Department of Environmental Quality
Water Protection Bureau
PO Box 200901
Helena, MT 59620-0901

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Telephone

The telephone number of the Principal Executive Officer must be printed in this section.

Date

The actual date that the DMR is signed by the Principal Executive Officer, certifying and authenticating the data submitted on the DMR. Note: You must not sign or submit the DMR before the end of the reporting period.

Comments

This section may contain clarifying information from either you or the Water Protection Bureau (WPB). You may include additional comments on a cover letter along with the DMR. Please read and note any comments that have been included in your pre-printed DMR.

Page Numbers

The number of each page is listed in the lower right hand corner of the DMR. If the page numbers have not already been filled, you must complete this section.

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