What does a good water analysis report include?

The laboratory name, accreditation details, and contact information should be clearly visible. It should also include the sample identification (unique ID, collection date, and location) as well as the client details.

This section outlines the different analyses conducted on the water sample. Only tests that were included on the original paperwork to the lab will be performed.

Examples include chemical testing for contaminants such as nitrates, arsenic, lead, and fluoride, microbiological assessments to detect coliform bacteria or E. coli, and physical measurements like pH, turbidity, conductivity, and total dissolved solids. If applicable, radiological testing may also be included to assess the presence of radioactive elements.

To ensure accuracy, the report should include a section detailing the methods used in the analysis. This lists the analytical techniques employed, such as EPA-approved methods, spectrometry, and chromatography. It also specifies detection limits, which indicate the smallest measurable concentration of a contaminant, and describes the quality control measures, including calibration procedures, proficiency testing, and validation steps used to guarantee reliability.

The measured values for each tested parameter in raw data format should also be present. This result shows whether contaminants exceed regulatory limits and provides a comparison with established standards to indicate the water’s safety.

These values are expressed in reporting units, such as milligrams per liter (mg/L), micrograms per liter (µg/L), colony-forming units per milliliter (CFU/mL), or picocuries per liter (pCi/L), ensuring consistency and clarity in the report. If necessary, conversion factors should be provided to facilitate better understanding.

Any potential issues with the data should be highlighted in the report. This may include qualifiers indicating contamination risks, regulatory compliance flags that signal exceedances of safety thresholds, or laboratory notes explaining anomalies or deviations from standard procedures. These flags serve as an early warning system for users interpreting the results

This section provides explanations of technical terms used throughout the report. It clarifies key concepts such as Maximum Contaminant Level (MCL), Method Detection Limit (MDL), and Limit of Detection (LOD). Additionally, it includes references to relevant regulations from the EPA, state, or local guidelines and offers interpretation guidance to help users understand the significance of the findings.