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TUALATIN, CITY OF
TUALATIN, OR 97062
503-691-3095

Primary Water Source Type Population Served
Surface water purchased 26879

This report was created on SEP-20-2019
Results are based on data extracted on JUL-21-2019

NOTICE: EPA is aware of inaccuracies and underreporting of some data in the Safe Drinking Water Information System. We are working with the states to improve the quality of the data.


The tables below list all violations that the state reported to EPA for this water system. Health-based violations are listed first, followed by monitoring, reporting, and other violations.

Health Based Violations: amount of contaminant exceeded safety standard (MCL) or water was not treated properly.
No health-based violations found. EPA has no record of any health-based violations reported by the state for this water system (Violations within last 10 years are included in this report).

Monitoring and Reporting and Other Violations: system failed to complete all samples or sample in a timely manner, or had another non-health-based violation. A significant monitoring violation means the system failed to take a large percentage of the required samples. Non-significant monitoring violations indicate that the water system failed to take some of the required samples, but did do some of the required sampling.
Type of Violation Compliance Period Begin Date Compliance Period End Date Drinking Water Rule or Contaminant Violation ID
Monitoring and Reporting (DBP) JAN-01-2017
MAR-31-2017
Total Haloacetic Acids (HAA5) 901649320

Follow-up Action Date of Response
St Compliance achieved
JUN-16-2017


Type of Violation Compliance Period Begin Date Compliance Period End Date Drinking Water Rule or Contaminant Violation ID
Monitoring and Reporting (DBP) JAN-01-2017
MAR-31-2017
TTHM 901649319

Follow-up Action Date of Response
St Compliance achieved
JUN-16-2017


For more information on:
Watersheds (the land areas drinking water comes from): Learn more about the health of this watershed.
Drinking water in your state
Drinking water in general: Visit EPA's Office of Ground Water and Drinking Water web site or call the Safe Drinking Water Hotline (1-800-426-4791). EPA has also prepared information about various regulated drinking water contaminants.
Advanced tools for accessing EPA drinking water data: https://www.epa.gov/waterdata/drinking-water-tools
Research Data: As well as monitoring the levels of drinking water contaminants for which EPA has set standards, EPA, states, and water systems also carry out studies of contaminants that may need to be regulated in the future. For more information about these, please see the National Contaminant Occurrence Database and the Microbe and Disinfection Byproducts study database.

Additional Information

In fiscal year 2005 (the last year for which EPA has complete data) based on information reported to EPA by the states, 1.5 percent of all systems reported a treatment technique violation, 6.1 percent of all systems reported an MCL violation, and 24 percent of all systems reported a reporting/monitoring violation.