Sampling and Analysis of Drinking Water:  Additional Information for Laboratories

• Submitting analytical data by Electronic Data Transfer (EDT), as required
• Alkalinity Conversions (PDF)
• PCBs: Guidance for Total PCBs Analysis (PDF)- September 1, 2006
• 1,4-Dioxane Method (PDF)- journal citation and CDPH contact information
• Interconverting Nitrate-N and Nitrate-NO3 (PDF) - April 15, 2011
• Radioactivity Analysis: Counting Errors (PDF)- December 1, 2006
• Borate/Carbonate/Bicarbonate Buffer for Sample Preservation for Hexavalent Chromium Analysis (PDF)- April 5, 2011
• Proposed Alternate Sample Preservation Buffer for Hexavalent Chromium (PDF)- May 18, 2010 
• Detection Limits:  Definitions (PDF)
• Detection Limits for Purposes of Reporting (DLRs) (Excel)define the analytical detection of a contaminant in terms of a level at which CDPH is confident about the quantification of the contaminant's presence in drinking water.  Data are required to be submitted if detections are at or above the DLR. 
• Related to DLRs, please see the following documents: 
• DLR Conformance with D/DBP2 Minimum Reporting Levels (PDF)- August 1, 2006
• Quality Control (QC) Protocols for Synthetic Organic Chemical Analyses (PDF)- September 11, 2003 draft
• Protocol for Improving the QC for Drinking Water Quality Regulation Compliance Monitoring Samples (PDF)- October 30, 2002