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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

Ask an expert for a specific consultation on your product. If you are ready to submit your samples for testing, click here to fill out the Sample Submission Form.

Code Test Request Quote
ENV210 Water Tests (Microbial): Membrane filtration, aerobic bacteria Add
ENV215 Water Tests (Microbial): Membrane filtration, aerobic w/ ext. incub. Add
ENV220 Water Tests (Microbial): Membrane filtration, anaerobic counts only Add
ENV230 Water Tests (Microbial): Membrane filtration, fungi (fungal sel. plates) Add
ENV240 Water Tests (Microbial): Membrane filtration, aerobic bacteria and fungi (fungal sel. plates) Add
ENV250 Water Tests (Microbial): Membrane filtration, total coliforms w/ 2 replicates Add
PWA305 USP Water Analysis: Purified Water study (TOC/Conductivity) Add
PWA320 USP Water Analysis: Water for Injection (LAL/TOC/Conductivity) Add
ENV210 - Water Tests (Microbial): Membrane filtration, aerobic bacteria
ENV215 - Water Tests (Microbial): Membrane filtration, aerobic w/ ext. incub.
ENV220 - Water Tests (Microbial): Membrane filtration, anaerobic counts only
ENV230 - Water Tests (Microbial): Membrane filtration, fungi (fungal sel. plates)
ENV240 - Water Tests (Microbial): Membrane filtration, aerobic bacteria and fungi (fungal sel. plates)
ENV250 - Water Tests (Microbial): Membrane filtration, total coliforms w/ 2 replicates
PWA305 - USP Water Analysis: Purified Water study (TOC/Conductivity)
PWA320 - USP Water Analysis: Water for Injection (LAL/TOC/Conductivity)

Sample Specifications

ENV210: Minimum 100 mL
ENV215: Minimum 100 mL
ENV220: Minimum 100 mL
ENV230: Minimum 100 mL
ENV240: Minimum 100 mL
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.

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