Ambient (recreational and ocean) water testingTotal Coliforms and E. coli MPN, undiluted (Order code: 8350)MethodEnzyme substrate—Chromogenic Standard Methods 9223 B-2016 Colilert DescriptionThis test employs the IDEXX, Inc Colilert™ Quantitray system, allowing the detection and enumeration of total coliforms by hydrolysis of ortho-nitrophenyl-ß-D-galactoside and Escherichia coli by hydrolysis of 4-methyl-umbelliferyl-ß-D-glucuronide. Enumeration results in the reporting of a Most Probable Number (MPN) and is commonly used to determine the microbial load of both the total coliforms and E. coli. Reference rangeResults for total coliforms and E. coli results range from <1 MPN to >2419.6 MPN for 100 mL of undiluted sample. Recommended limits vary by water source. Turnaround time1 day Total Coliforms and E. coli MPN, 1:10 dilution (Order code: 8025)MethodEnzyme substrate—Chromogenic Standard Methods 9223 B-2016 Colilert DescriptionThis test employs the IDEXX, Inc Colilert™ Quantitray system, allowing the detection and enumeration of total coliforms by hydrolysis of ortho-nitrophenyl-ß-D-galactoside and Escherichia coli by hydrolysis of 4-methyl-umbelliferyl-ß-D-glucuronide. Enumeration results in the reporting of a Most Probable Number (MPN) and is commonly used to determine the microbial load of both the total coliforms and E. coli. This is the most commonly used test for determination of safety of recreational water. Reference rangeFor marine waters used for recreation, total coliforms should be less than 10,000 MPN per 100 mL for a single sample and an average of less than 1,000 MPN for a 30-day sampling period; E. coli should be less than 400 MPN per 100 mL for a single sample and an average of less than 200 MPN for a 30-day sampling period. Turnaround time1 day
Enterococci MPN, undiluted (Order code: 8110)MethodDefined substrate hydrolysis—Chromogenic Standard Methods 9230 D-2013 Enterolert DescriptionThis test employs the IDEXX, Inc Enterolert™ Quantitray system, allowing the detection and enumeration of Enterococci by hydrolysis of 4-methyl-umbelliferyl glucoside. Enumeration results in the reporting of a Most Probable Number (MPN) and is commonly used to determine the microbial load of enterococci, an enteric bacterium that is easily and accurately detected and enumerated in marine and brackish waters. Reference rangeEnterococci MPN should be less than 104 MPN per 100mL for a single sample and an average of less than 35 MPN for a 30-day sampling period for recreational waters to be considered safe for recreational activities, such as swimming. Turnaround time1 day Enterococci MPN, 1:10 dilution (Order code: 8010)MethodDefined substrate hydrolysis—Chromogenic Standard Methods 9230 D-2013 Enterolert DescriptionThis test employs the IDEXX, Inc Enterolert™ Quantitray system, allowing the detection and enumeration of Enterococci by hydrolysis of 4-methyl-umbelliferyl glucoside. Enumeration results in the reporting of a Most Probable Number (MPN) and is commonly used to determine the microbial load of enterococci, an enteric bacterium that is easily and accurately detected and enumerated in marine and brackish waters. Reference rangeEnterococci MPN should be less than 104 MPN per 100mL for single sample and less than 35 MPN for a 30-day sampling period for recreational waters to be considered safe for recreational activities, such as bathing. Turnaround time1 day |
County of San Luis Obispo
Public Health Laboratory
Ambient water testing