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Virginia Administrative Code
Title 1. Administration
Agency 30. Department of General Services
Chapter 45. Certification for Noncommercial Environmental Laboratories
12/30/2024

1VAC30-45-796. Microbiology testing: quality of standards, reagents, and media.

A. The laboratory shall ensure that the quality of the reagents and media used is appropriate for the test concerned.

B. Culture media may be prepared from commercial dehydrated powders or may be purchased ready to use. The laboratory may prepare media from basic ingredients when commercial media are not available or when it can be demonstrated that commercial media do not provide adequate results. Media prepared by the laboratory from basic ingredients shall be tested for performance (e.g., for selectivity, sensitivity, sterility, growth promotion, growth inhibition) prior to first use. Detailed testing criteria information shall be defined in either the laboratory's test methods, SOPs, quality manual, or similar documentation.

C. Reagents, commercial dehydrated powders and media shall be used within the shelf-life of the product and shall be documented according to 1VAC30-45-730 J.

D. Distilled water, deionized water or reverse osmosis produced water free from bactericidal and inhibitory substances shall be used in the preparation of media, solutions and buffers. The quality of the water shall be monitored for chlorine residual, specific conductance, and heterotrophic bacteria plate count monthly (when in use), when maintenance is performed on the water treatment system, or at startup after a period of disuse longer than one month.

E. Analysis for metals and the Bacteriological Water Quality Test (to determine presence of toxic agents or growth promoting substances) shall be performed annually. Results of these analyses shall meet the specifications of the required method and records of analyses shall be maintained for three years. (An exception to performing the Bacteriological Water Quality Test shall be given to laboratories that can supply documentation to show that their water source meets the criteria, as specified by the method, for Type I or Type II reagent water.)

F. Media, solutions and reagents shall be prepared, used and stored according to a documented procedure following the manufacturer's instructions or the test method. Documentation for media prepared in the laboratory shall include date of preparation, preparer's initials, type and amount of media prepared, manufacturer and lot number, final pH of the media, and expiration date. Documentation for media purchased pre-prepared, ready to use shall include manufacturer, lot number, type of media received, date of receipt, expiration date of the media, and pH of the media.

Statutory Authority

§ 2.2-1105 of the Code of Virginia.

Historical Notes

Derived from Virginia Register Volume 25, Issue 7, eff. January 1, 2009; amended, Virginia Register Volume 32, Issue 22, eff. September 1, 2016.

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