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Inventory Updates

The information on this page is designed for and intended for use by Drinking Water Services County and Department of Agriculture partners who have specialized training and are registered as environmental health specialists. If you have questions regarding this material please contact Drinking Water Services at (971) 673-0405.

  • PDF iconTreatment Codes
  • Water system classification for operator certification requirements:
    Water treatment plants and distribution systems at community and non-transient non-community public water systems are classified based on the size and complexity of the water system facility according toOAR-333-061-0220. Classification of a water system or water system facility determines the level of certification required for operators in direct responsible charge of a water system or water system facility as prescribed byOAR 333-061-0225. Use either of the following worksheets to classify a water system: PDF -or- Excel 

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