OAR 333-061-0550: Analytical Methods

(1) Water suppliers must use a laboratory accredited according to OAR chapter 333, division 64 and the Oregon Environmental Laboratory Accreditation Program (ORELAP), or the Oregon Department of Environmental Quality Laboratory to analyze samples required by OAR 333-061-0510 to 333-061-0580. (2) For total microcystins, water suppliers must ensure that samples are analyzed using EPA method 546, or another EPA-approved method that applies at the time samples are analyzed. Eurofins Abraxis SAES ELISA kits (520011SAES) are equivalent to ELISA kits (520011OH) as described in section 6.1 of EPA Method 546. (3) For cylindrospermopsin, water suppliers must ensure that samples are analyzed using the DEQ Analytical Method for Determination of Cylindrospermopsin in Raw and Finished Water by ELISA Method, or another EPA-approved method that applies at the time samples are analyzed. If detections are found greater than 0.7 µg/L at the entry point or distribution system, all samples taken in response to this detection must be analyzed using EPA Method 545, or another EPA-approved method that applies at the time samples are analyzed. (4) Water suppliers must ensure that laboratories and subcontracted laboratories start analysis of samples within one business day of receipt.