| Reporting Code | Reporting Short Description | Extended Description |
| A | Consistent Attainment Of Benchmark | This code and its use is defined in the Industrial Stormwater General Permit |
| B | Below Detection Limit/No Detection | Most permits require you to include the numeric value of the lab reported detection level, which can be entered on the DMR form as, for example, <0.50. Use when the lab reports a non-detect or below detection (like "< 0.50 mg/L" or "ND"). Don't include units when submitting this information. |
| C | No Discharge | No Discharge means that the site or monitoring point did not discharge any stormwater/wastewater/pollutant during the monitoring period. |
| E | Analysis Not Complete/ Not Conducted/Not Reported | This code means you did not collect a sample or the sample was not analyzed for the parameter. If you use this code, please briefly describe why the analysis was not conducted. |
| FC | Frozen Conditions/Unsafe conditions | Frozen Conditions/Unsafe conditions |
| G | Incorrect Sampling Frequency | Incorrect Sampling Frequency |
| H | Greater Than | Greater Than |
| I | Unverified/Incorrect/Reevaluate Data | Unverified/Incorrect/Reevaluate Data |
| IF | Inactive Facility | Inactive Facility |
| J | Estimated Value/Below Quantitation Limit | Estimated Value/Below Quantitation Limit |
| L | Dry Groundwater Well | Dry Groundwater Well |
| LE | Laboratory Error | Permittees should use this code if the laboratory was unable to complete the testing (for example the sample broke) or the laboratory used the wrong test on the sample and there is no data to report. |
| M | Monitoring Is Conditional/Not Req This MP | Monitoring is conditional/not required at this monitoring point (MP) - Use this code if your permit includes an exemption from monitoring under permit specified conditions. |
| O | Other violation | If none of the other codes apply and you do not have a value to report, use this code and describe the situation in the comments box. Do not use this code at the DMR or monitoring point level. |
| Q | Natural Disaster | Flooding, fire, earthquake or other natural disaster. |
| WR | Waiting On Test Results | Laboratory was unable to complete the testing on time for the permittee to submit their discharge monitoring reports. |
| X | Construction Not Started | This code is available for construction stormwater permittees that have not yet started construction (disturbed the soil). |