OHA Drinking Water Services
OR41
PWS ID: 00958 ---- YONCALLA, CITY OF

Most Recent Water System Survey
Survey date: Jun 18, 2025
Notification date: Jul 16, 2025 (28 days)
Regulating agency: DWS (REGION 2)
Survey frequency: 3 YR  -  Visit the Water System Surveys page to see the list of surveys due each year.
Significant deficiencies and unmet rule requirements:
Category Significant deficiency or unmet rule requirement Due date Resolved date
Disinfection Unable to demonstrate minimum CTs are metMay 15, 2026 *
Disinfection No means to adequately determine flow rate on contact chamber effluent lineMay 15, 2026 *
Disinfection pH, temperature, and chlorine residual not measured daily at first userMay 15, 2026 *
Disinfection Failure to calculate CT values correctlyMay 15, 2026 *
Disinfection No means to adequately determine disinfection contact time under peak flow and minimum storage conditionsMay 15, 2026 *
Cross Connection Annual summary report not issued (CWS)Sep 03, 2025 Oct 09, 2025 - Late
Cross Connection Testing records not current (CWS, NTNC, TNC)Sep 03, 2025 Oct 09, 2025 - Late
Bold text indicates a significant deficiency. All others are unmet rule requirements.
* A corrective action plan has been submitted for this significant deficiency or unmet rule requirement.


 Hide Site Visit History
Water System Site Visit History
Reason Visit date Frequency Next due Notification date
(Days after survey)		 Responsible
agency		 Comments and
significant deficiencies or unmet rule requirements
Sanitary Survey, Finished (SNSV) 06/18/2025 3 YR  * 07/16/2025 (28) REGION 2 Show details
Sanitary Survey, Finished (SNSV) 12/01/2022 3 YR  * 01/13/2023 (43) REGION 2 Hide details
 
Category Significant deficiency or unmet rule requirement Due date Resolved date
Management & Operations Master plan not current (≥ 300 connections)Dec 31, 2023 * Overdue
Cross Connection Annual summary report not issued (CWS)Mar 03, 2023 Mar 01, 2023
Cross Connection Testing records not current (CWS, NTNC, TNC)Mar 03, 2023 Mar 01, 2023
Monitoring & Reporting No coliform sampling planMar 03, 2023 Mar 01, 2023
Surface Water Treatment Conventional or direct filtration: Turbidity profile not conducted on individual filters at least quarterlyMar 03, 2023 Mar 01, 2023
* A corrective action plan has been submitted for this significant deficiency or unmet rule requirement.
Water Treatment Plant Site Visit (TRTP) 12/01/2022 3 YR 12/01/2025 01/03/2023 (33) REGION 2 No details
Sanitary Survey, Finished (SNSV) 12/02/2019 3 YR  * 01/17/2020 (46) DWP Show details
Water Treatment Plant Site Visit (TRTP) 12/02/2019 3 YR 12/02/2022 01/17/2020 (46) DWP No details
Sanitary Survey, Finished (SNSV) 12/07/2016 3 YR  * 02/13/2017 (68) REGION 2 Show details
Water Treatment Plant Site Visit (TRTP) 12/07/2016 3 YR 12/07/2019 02/13/2017 (68) REGION 2 No details
Sanitary Survey, Finished (SNSV) 07/25/2013 3 YR  * REGION 2 No details
Water Treatment Plant Site Visit (TRTP) 07/25/2013 3 YR 07/25/2016 REGION 2 No details
Sanitary Survey, Finished (SNSV) 12/08/2010 3 YR  * REGION 2 Show details
Water Treatment Plant Site Visit (TRTP) 12/08/2010 3 YR 12/08/2013 REGION 2 No details
Sanitary Survey, Finished (SNSV) 09/18/2007 3 YR  * 09/18/2007 (0) REGION 2 No details
Water Treatment Plant Site Visit (TRTP) 09/18/2007 3 YR 09/18/2010 09/18/2007 (0) REGION 2 No details
Sanitary Survey, Finished (SNSV) 03/29/2005 3 YR  * DWP Show details
Water Treatment Plant Site Visit (TRTP) 03/29/2005 3 YR 03/29/2008 03/29/2005 (0) REGION 2 No details