This slide presentation outlines a study with the objectives of: determining the capabilities of each product to detect total coliform and E. coli in three chemically diverse Wisconsin groundwaters; determining the ability of each product to accurately quantify the number of total coliforms and E. coli in Wisconsin groundwaters; determining the ability of each test to suppress Aeromonas spp.; and, determine the unit cost per test. Chemical analysis was conducted each time a collection was made from each site, and analysis was done for alkalinity, pH, hardness, conductivity and soluble iron content. Chemical characteristics of the groundwater sampling sites are given. Elements of the project design are outlined and include: each site was sampled twice, once for the total coliform detection objectives and once for Aeromonas spp. suppression experiments; samples were dispensed and spiked with five total coliforms separately at two different levels of contamination, and each was spiked in triplicate for the total coliform objectives; and, the Aeromonas spp. objectives consisted of dispensing 100mL samples and spiking with six different contamination levels of two different strains of Aeromonas spp. in triplicate. Results indicated that: some methods were unable to detect certain species of total coliform from groundwater sources; major differences were seen in the ability of each test to quantify amounts of total coliform and E. coli; and, vast dissimilarities were seen between methods and strains to suppress Aeromonas spp. The presentation goes on to outline these discussion points: some methods were unable to detect certain species of total coliform in Wisconsin groundwaters; major differences were seen in the ability of each test to quantify amounts of total coliform and E. coli; and, vast dissimilarities were seen between methods and strains to suppress Aeromonas spp.. Includes tables, figures.