OHA Drinking Water Services
OR41
PWS ID: 00823 ---- SILVERTON, CITY OF

Most Recent Water System Survey
Survey date: Jul 24, 2025
Notification date: Aug 12, 2025 (19 days)
Regulating agency: DWS (REGION 1)
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 No means to adequately determine flow rate on contact chamber effluent lineDec 31, 2026 *
Disinfection No means to adequately determine disinfection contact time under peak flow and minimum storage conditionsDec 31, 2026 *
Cross Connection No cross connection control specialist (CWS ≥ 300 connections)Sep 30, 2025 Aug 14, 2025
Disinfection Chlorine not measured & recordedSep 30, 2025 Aug 26, 2025
Management & Operations Major modifications not approved (plan review)Dec 31, 2025 * Feb 24, 2026 - Late
Operator Certification No protocol for under-certified operatorDec 31, 2025 * Jan 07, 2026 - 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) 07/24/2025 3 YR  * 08/12/2025 (19) REGION 1 Show details
Sanitary Survey, Finished (SNSV) 07/07/2022 3 YR  * 07/29/2022 (22) REGION 1 Show details
Water Treatment Plant Site Visit (TRTP) 07/07/2022 3 YR 07/07/2025 07/29/2022 (22) REGION 1 No details
Sanitary Survey, Finished (SNSV) 12/10/2019 3 YR  * 01/13/2020 (34) REGION 1 Show details
Water Treatment Plant Site Visit (TRTP) 12/10/2019 1 YR 12/10/2020 01/13/2020 (34) REGION 1 No details
Sanitary Survey, Finished (SNSV) 12/01/2016 3 YR  * 12/14/2016 (13) REGION 1 Show details
Water Treatment Plant Site Visit (TRTP) 12/01/2016 3 YR 12/01/2019 12/14/2016 (13) REGION 1 No details
Sanitary Survey, Finished (SNSV) 04/11/2013 3 YR  * 05/21/2013 (40) REGION 1 No details
Water Treatment Plant Site Visit (TRTP) 04/11/2013 1 YR 04/11/2014 05/21/2013 (40) REGION 1 No details
Sanitary Survey, Finished (SNSV) 11/17/2009 3 YR  * 01/12/2010 (56) REGION 1 No details
Water Treatment Plant Site Visit (TRTP) 11/17/2009 1 YR 11/17/2010 01/12/2010 (56) REGION 1 No details
Sanitary Survey, Finished (SNSV) 01/10/2000 3 YR  * DWP Show details