Your Water Quality

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Click image to view 2017 Water Quality Report


Seattle Public Utilities (our water provider) links:

NUD Water Quality additional info

2017 Water Quality Report Cover Photo


Customers of Northshore Utility District enjoy water of very high quality.  Our water comes from the Tolt Reservoir, a protected watershed in the Cascade Mountains, and is delivered via the Tolt Pipeline.

After the water reaches our District, Northshore takes the following measures to ensure that it remains clean and pure:

  • Each year all of our water main lines (over two hundred miles) are flushed to remove any sediment build-up.

  • All new water lines are disinfected, flushed and sampled before they are brought into service.

  • Our water is tested approximately every three days by Seattle Public Utilities for coliform bacteria.

  • All reservoirs (water storage units) are equipped with telemetry systems that continuously monitor chlorine residuals and pH. Lake Forest Park monitors turbidity.

  • All reservoirs are drained and disinfected on a regular schedule.

  • There is a water quality coordinator on staff who monitors water quality.

  • The District maintains an active Cross-Connection control program.

  • Older steel pipelines have been removed and replaced with ductile iron pipe, which is more resistant to rusting and leaking.

If you have questions about water quality you may call or email our Water Quality Office at (425) 398-4419,

Water Quality FAQ
Click HERE for answers to most common questions about water quality.

Water Quality Reports
Click HERE for the current Water Quality Report.

Report archives:

2017 Publication 2016 Publication  
2015 Publication 2007 Publication 
2014 Publication 2006 Publication 
2013 Publication 2005 Publication
2012 Publication 2004 Publication
2011 Publication 2003 Publication
2010 Publication 2002 Publication
2009 Publication 2001 Publication
2008 Publication 2000 Publication