Water Quality Testing

Drinking fountain releasing water

The Northshore School District began testing its drinking water in 2004 and has continued to do so about every five years, as recommended by the Environmental Protection Agency. The most current testing of lead and copper was complete in 2015 with the next round of testing scheduled for 2020.

We believe it is important to maintain a regular testing schedule as it is possible for water lines to develop issues over time. Our regular testing ensures we catch new issues in water quality.


How We Test

The district contracts with PBS Environmental & Engineering, a consultant company who designs, performs and monitors water quality testing for a number of districts in the region. During the 2015 water quality testing:

  • Staff collected 862 water samples from 788 sampling sites at 35 building locations over a period of about six months following the EPA water collection process and criteria.
  • Water sources included drinking fountains, food prep sinks. ice makers, and other known fountains or sinks used as a drinking source.
  • Water sources were collected and tested at two main points: first draw is at the fixture and the second draw is a “flush test” that checks levels in the water lines.
  • Each water sample was assigned a unique identification number that correlates to a master drawing. PBS Environmental oversees a chain-of-custody documentation that is cross-matched with the drawings and water container labels before being delivered (within 24 hrs) to the independent testing company.


Test Results

In the 2015 test results:

  • 862 fixtures were tested.
  • 12 fixtures (<1%) contained levels of lead slightly above the EPA recommendation.
  • 1 fixture had a slightly elevated level of copper.
  • The 13 fixtures were replaced and immediately re-tested following the EPA water collection process and criteria.
  • All 788 sampled sites, including the 13 replaced fixtures passed the EPA water quality guidelines in 2015 for both lead and copper.


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(425) 408-7801