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.
Deficiencies:
Category Deficiency Due Date Resolved Date
Management & Operations Major modifications not approved (plan review)Dec 31, 2025 *
Operator Certification No protocol for under-certified operatorDec 31, 2025 *
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 & recorded as requiredSep 30, 2025 Aug 26, 2025
* Corrective Action Plan has been submitted for this deficiency.


 Hide Site Visit History
Water System Site Visit History
Reason Visit Date Frequency Next Due Notification Date
(Days after survey)		 Responsible
Agency		 Comments and
Deficiencies
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 Hide details
 
Category Deficiency Due Date Resolved Date
Disinfection No means to adequately determine disinfection contact time under peak flow and minimum storage conditionsOct 01, 2017 * Overdue
* Corrective Action Plan has been submitted for this deficiency.
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
 



More information for this water system: SDWIS ID 3910
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