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Water Tests

Water Tests

Water tests are used to evaluate microbial content and chemical purity of water samples. Because water is a significant environmental component, microbial control is a requirement of all Good Manufacturing Practices. Tests can be performed on source water, process water, purified water, deionized water and highly purified water.

Nelson Laboratories will customize water tests to meet the precise needs of the sponsor.

Applicable Standards

  • USP 1231
  • Standard Methods for Examination of Water and Wastewater
  • Good Manufacturing Practices

Test Options

Standard turn around times (TAT) are listed below. Ask an expert for a specific consultation on your product.

Code Test TAT (days) Request Quote
ENV210 Water Tests (Microbial): Membrane Filtration, Aerobic bacteria only 7 Add
ENV215 Water Tests (Microbial): Membrane Filtration, Aerobic w/ ext. incub. 14 Add
ENV220 Water Tests (Microbial): Membrane Filtration, Anaerobic counts only 10 Add
ENV230 Water Tests (Microbial): Membrane Filtration, Fungal (sel. plates) 10 Add
ENV240 Water Tests (Microbial): Membrane Filtration, Aerobic and Fungal 10 Add
MCC130 Total Coliforms: Membrane Filtration Method, 2 replicates 6 Add
PWA305 USP Water Analysis: Purified Water study (TOC/Conductivity) 5 Add
PWA320 USP Water Analysis: Water for Injection (LAL/TOC/Conductivity) 7 Add
ENV210 - Water Tests (Microbial): Membrane Filtration, Aerobic bacteria only
7 days
ENV215 - Water Tests (Microbial): Membrane Filtration, Aerobic w/ ext. incub.
14 days
ENV220 - Water Tests (Microbial): Membrane Filtration, Anaerobic counts only
10 days
ENV230 - Water Tests (Microbial): Membrane Filtration, Fungal (sel. plates)
10 days
ENV240 - Water Tests (Microbial): Membrane Filtration, Aerobic and Fungal
10 days
MCC130 - Total Coliforms: Membrane Filtration Method, 2 replicates
6 days
PWA305 - USP Water Analysis: Purified Water study (TOC/Conductivity)
5 days
PWA320 - USP Water Analysis: Water for Injection (LAL/TOC/Conductivity)
7 days

Sample Specifications

ENV210: Minimum 100 mL
ENV215: Minimum 100 mL
ENV220: Minimum 100 mL
ENV230: Minimum 100 mL
ENV240: Minimum 100 mL
MCC130: 200 mL, 2 samples included in test code for replicate testing
PWA320: 155 mL; please use appropriate sampling bottles.

Study Outline

In Water testing, water samples are filtered using a 0.45 micron filter membrane to capture microorganism. The membrane is then applied to an agar plate. After incubation, the colony forming units are counted to give the organisms per milliliter.

Analysis is generally performed by the test method described in the Standard Methods for Examination of Water and Wastewater, which indicates the use of membrane filtration and R2A agar. Depending on the type of water, plating may be performed on Soybean Casein Digest Agar or selective agar for fungal growth. The amount of sample filtered, incubation time and temperature parameters are variable and must be defined by the sponsor prior to testing. These variables are determined by the type of water sample.