| A | DWR | Reported value is an average, where at least one result is qualified with a “U”. PQL is used for qualified result(s) to calculate average. |
| B | GEL | Target analyte was detected in associated blank. |
| B1 | DWR | Countable membranes with less than 20 colonies. Reported value is estimated or is a total of counts on all filters reported per 100 ml. |
| B2 | DWR | Counts from all filters were zero. value reported is based on number of colonies per 100 ml that would have been reported if there had been one colony on filter representing largest filtration volume (reported as a less than "<" value). |
| B3 | DWR | Countable membranes with more than 60 or 80 colonies. Value reported is calculated using count from smallest volume filtered and reported as a greater than ">" value. |
| B4 | DWR | Filters have counts of both >60 or 80 and <20. Reported value is estimated or is a total of counts on all filters reported per 100 ml. |
| B5 | DWR | Too many colonies were present; too numerous to count (TNTC). TNTC is generally defined as >150 colonies. |
| B6 | DWR | Estimated Value. Blank contamination evident. |
| B7 | DWR | Many non-coliform or non-enterococcus colonies or interfering non-coliform or non-enterococcus growth present. In this competitive situation, reported value may under-represent actual density. |
| C | DWR | Total residual chlorine was present in sample upon receipt in laboratory; value is estimated. Generally applies to cyanide, phenol, NH3, TKN, coliform, and organics. |
| G1 | DWR | Dissolved oxygen (DO) depletion of dilution water blank exceeded 0.2 mg/L. |
| G10 | DWR | cBOD value is greater than BOD value. |
| G2 | DWR | Bacterial seed controls did not meet requirement of a DO depletion of at least 2.0 mg/L and/or a DO residual of at least 1.0 mg/L. |
| G3 | DWR | No sample dilution met requirement of a DO depletion of at least 2.0 mg/L and/or a DO residual of at least 1.0 mg/L. |
| G4 | DWR | Evidence of toxicity was present. This is generally characterized by a significant increase in BOD value as sample concentration decreases. Reported value is calculated from highest dilution representing maximum loading potential and should be considered an estimated value. |
| G5 | DWR | Glucose/ glutamic acid standard exceeded range of 198 ± 30.5 mg/L. |
| G6 | DWR | Calculated seed correction exceeded range of 0.6 to 1.0 mg/L. |
| G7 | DWR | Less than 1 mg/L DO remained for all dilutions set. Reported value is an estimated greater than value and is calculated for dilution using least amount of sample. |
| G8 | DWR | Oxygen usage is less than 2 mg/L for all dilutions set. Reported value is an estimated less than value and is calculated for dilution using most amount of sample. |
| G9 | DWR | DO depletion of dilution water blank produced a negative value. |
| h | GEL | Preparation or preservation holding time was exceeded. |
| J | GEL | Value is estimated. |
| J1 | DWR | Surrogate recovery limits have been exceeded. |
| J10 | DWR | Unidentified peak; estimated value. |
| J11 | DWR | Reported value is determined by a one-point estimation rather than against a regression equation. Estimated concentration is less than laboratory PQL and greater than instrument noise level. This code is used when an MDL has not been established for the analyte in question. |
| J12 | DWR | Calibration verification did not meet calibration acceptance criterion for field parameters. |
| J2 | DWR | Reported value failed to meet established quality control criteria for either precision or accuracy. |
| J3 | DWR | Sample matrix interfered with ability to make any accurate determination. |
| J4 | DWR | Data is questionable because of improper laboratory or field protocols (e.g., composite sample was collected instead of grab, plastic instead of glass container, etc.). |
| J5 | DWR | Temperature limits exceeded (samples frozen or >6°C) during transport or not verifiable (e.g., no temperature blank provided): nonreportable for NPDES compliance monitoring. |
| J6 | DWR | Laboratory analysis was from an unpreserved or improperly chemically preserved sample. data may not be accurate. |
| J7 | DWR | This qualifier is used to identify analyte concentration exceeding upper calibration range of analytical instrument/method. The reported value should be considered estimated. |
| J8 | DWR | Temperature limits exceeded (samples frozen or >6ºC) during storage, data may not be accurate. |
| J9 | DWR | Reported value is determined by a one-point estimation rather than against a regression equation. Estimated concentration is less than laboratory PQL and greater than laboratory method detection limit. |
| M | DWR | Sample and duplicate results are "out of control". Sample is non-homogenous (e.g., VOA soil). Reported value is lower value of duplicate analyses of a sample. |
| N1 | DWR | Component has been tentatively identified based on mass spectral library search. |
| N2 | DWR | There is an indication that analyte is present, but quality control requirements for confirmation were not met (i.e., presence of analyte was not confirmed by alternate procedures). |
| N3 | DWR | This code shall be used if level is too low to permit accurate quantification, but estimated concentration is less than laboratory PQL and greater than laboratory method detection limit. This code is not routinely used for most analyses. |
| N4 | DWR | This code shall be used if level is too low to permit accurate quantification, but estimated concentration is less than the laboratory practical quantitation limit and greater than instrument noise level. This code is used when an MDL has not been established for analyte in question. |
| N5 | DWR | Component has been tentatively identified based on a retention time standard. |
| P | DWR | Sample dilution occurred due to either matrix interference or target analytes being present at concentrations greater than calibration curve. Reported target analyte values are obtained from results which were bracketed by calibration curve. |
| Q1 | DWR | Holding time exceeded prior to receipt by lab. |
| Q2 | DWR | Holding time exceeded following receipt by lab. |
| S | DWR | Not enough sample provided to prepare and/or analyze a method-required matrix spike (MS) and/or matrix spike duplicate (MSD). |
| U | DWR | Indicates that analyte was analyzed for, but not detected above reported PQL. Number value reported with "U" qualifier is equal to laboratory's PQL*. If "P" qualifier is reported with this "U" qualifier, then reported PQL elevated. |
| U | GEL | Analyte was analyzed for, but not detected above MDL, MDA, MDC or LOD. |
| UU | DWR | Indicates that analyte was not detected by a screen analysis. Number value reported with "UU" qualifier is equal to laboratory's PQL. Number value was determined by a one-point estimation at PQL, rather than against a regression equation. |
| V1 | DWR | Analyte was detected in both sample and method blank. |
| V2 | DWR | Analyte was detected in both sample and field blank. |
| X | GEL | Standards used to make initial calibration curve did not meet the ISO 17025 criterion. These are only standard available for these analytes. Additional sample volume was not provided to use for matrix QC. |
| X1 | DWR | Sample not screened for this compound. |
| X2 | DWR | Sampled, but analysis lost or not performed-field error. |
| X3 | DWR | Sampled, but analysis lost or not performed-lab error. |
| Y | DWR | Elevated PQL due to insufficient sample size. |
| Z1 | DWR | Sample analysis/results are not reported due to inability to analyze sample. presence or absence of analyte cannot be verified. |
| Z2 | DWR | Sample analysis/results are not reported due to questions concerning data reliability. presence or absence of analyte cannot be verified. |