Public Water System: Tualatin, City Of's tap water quality report is the compilation of data collected from federal, state, and local government agencies, most prominently the EPA. We strive to populate the report with the latest data concerning water contaminants, lead and copper levels, and water quality violations. We only collect drinking water data from public water systems.

PWS Service Information
PWS ID: OR4100906
Type: Community water system
EPA Region: 10
Primary Service Area: Municipality
Primary Source: Surface water purchased
Population Served: 26,879
Contact Information

This public water system services 1 municipality in 1 county.

Summary Results

A summary view of the the times a water contaminant was tested and found to exceed the level set by the EPA (the MCL).

We couldn't find any records of contaminants exceeding the regulated limits in your water.

Other Water Contaminants Tested

The following contaminants were tested and within national EPA guidelines.

We couldn't find any records of contaminants in your water.

Lead and Copper Data

Lead and copper are recorded separately from other contaminants because of the Lead and Copper Rule. As with all other results, these are the findings at the water supply. Lead and copper can be — and often are — added to drinking water in between the water facility and a tap.

Sample ID Contaminant Sampling Start Date Sampling End Date Result
OR28334 lead 2017-01-01 2017-06-30 0.0145mg/L
OR28082 lead 2016-07-01 2016-12-31 0.0174mg/L
OR27179 lead 2016-01-01 2016-06-30 0.013mg/L
OR27015 lead 2015-07-01 2015-12-31 0.0141mg/L
OR26080 lead 2015-01-01 2015-06-30 0.0141mg/L
OR25840 lead 2014-07-01 2014-12-31 0.0142mg/L
OR24904 lead 2014-01-01 2014-06-30 0.0128mg/L
OR24854 lead 2013-07-01 2013-12-31 0.0159mg/L
OR24213 lead 2013-01-01 2013-06-30 0.01mg/L
OR24212 lead 2012-07-01 2012-12-31 0.012mg/L
OR22784 lead 2012-01-01 2012-06-30 0.011mg/L
OR24211 lead 2012-01-01 2012-06-30 0.011mg/L
OR22526 lead 2011-07-01 2011-12-31 0.012mg/L
OR24210 lead 2011-07-01 2011-12-31 0.012mg/L
OR21698 lead 2011-01-01 2011-06-30 0.009mg/L
OR21570 lead 2010-07-01 2010-12-31 0.012mg/L
OR20598 lead 2010-01-01 2010-06-30 0.01mg/L
OR20476 lead 2009-07-01 2009-12-31 0.009mg/L
OR19495 lead 2009-01-01 2009-06-30 0.01mg/L
OR19369 lead 2008-07-01 2008-12-31 0.01mg/L


Known violations of the Safe Drinking Water Act as recorded by the EPA.

Compliance Dates Rule Violation Type Contaminant Name Status
2017-01-01 - 2017-03-31 Stage 2 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) Total Haloacetic Acids (HAA5) Returned to Compliance
2017-01-01 - 2017-03-31 Stage 2 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) TTHM Returned to Compliance
2007-08-01 - 2007-08-31 Total Coliform Rule Monitoring, Routine Major (TCR) Coliform (TCR) Returned to Compliance

What My Water Data Means

Water data isn't always easy to interpret, but by following the links on this page you should be able to have most of your questions answered. By clicking the name of a water contaminant or secondary substance you can learn about that specific substance. Ultimately this page should give you some insight towards learning if your water is safe, what water filter you should buy (if any), and how well your local water compares against other sources.


The origin of's water data is explained on our Data Sources page.

Why Is My Water Data Not More Recent?

The recency of the data for your ZIP code depends on the last your water source was tested, by a federal, state, or local agency. More information about the timing can be determined by learning about the dataset in question and seeing how often the EPA (other another governing body) mandated testing.