OHA Drinking Water Services
OR41
PWS ID: 00239 ---- LONDON WATER CO-OP

Most Recent Water System Survey
Survey Date: Nov 05, 2025
Notification Date: Dec 12, 2025 (37 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.
Deficiencies:
Category Deficiency Due Date Resolved Date
Cross Connection Annual summary report not issued (CWS)Mar 31, 2026 *
Management & Operations Annual CCR not submitted (CWS)Mar 31, 2026 *
Operator Certification No protocol for under-certified operatorMar 31, 2026 *
Treatment UV reactors not monitored as requiredMar 31, 2026 *
Disinfection pH, temperature, and chlorine residual not measured daily at first userMar 31, 2026 *
Surface Water Treatment Turbidity standards not metMar 31, 2026 *
Surface Water Treatment Turbidimeters not calibrated per manufacturer or at least quarterlyMar 31, 2026 *
UV Disinfection Bypass around UV systemMar 31, 2026 *
Management & Operations Emergency response plan not completedJan 30, 2026 Feb 17, 2026 - Late
Disinfection Chlorine not measured & recorded as requiredJan 30, 2026 Feb 17, 2026 - Late
* 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) 11/05/2025 3 YR  * 12/12/2025 (37) REGION 2 Show details
Sanitary Survey, Finished (SNSV) 10/14/2022 3 YR  * 02/02/2023 (111) REGION 2 Show details
Water Treatment Plant Site Visit (TRTP) 10/14/2022 6 MN 04/14/2023 02/02/2023 (111) REGION 2 No details
Sanitary Survey, Finished (SNSV) 09/11/2019 3 YR  * 11/20/2019 (70) REGION 2 Show details
Water Treatment Plant Site Visit (TRTP) 09/11/2019 6 MN 03/11/2020 11/20/2019 (70) REGION 2 No details
Sanitary Survey, Finished (SNSV) 07/07/2016 3 YR  * 07/14/2016 (7) REGION 2 Hide details
 
Category Deficiency Due Date Resolved Date
Cross Connection Annual summary report not issued (CWS)Sep 01, 2016 Mar 22, 2022 - Late
Finished Water Storage No flap valve, screen, or equivalent on overflowSep 01, 2016 Dec 23, 2017 - Late
Management & Operations Major modifications not approved (plan review)Sep 01, 2016 Dec 08, 2016 - Late
Monitoring & Reporting Monitoring not currentSep 01, 2016 Aug 19, 2016
Other Treatment Non-NSF approved chemicalsSep 01, 2016 Oct 24, 2022 - Late
Water Treatment Plant Site Visit (TRTP) 07/07/2016 1 YR 07/07/2017 07/14/2016 (7) REGION 2 No details
Sanitary Survey, Finished (SNSV) 05/28/2013 3 YR  * 08/29/2013 (93) REGION 2 No details
Water Treatment Plant Site Visit (TRTP) 05/28/2013 6 MN 11/28/2013 08/29/2013 (93) REGION 2 No details
Water Treatment Plant Site Visit (TRTP) 12/29/2010 6 MN 06/29/2011 03/02/2011 (63) REGION 2 Show details
Sanitary Survey, Finished (SNSV) 03/10/2010 3 YR  * 04/20/2010 (41) REGION 2 No details
Water Treatment Plant Site Visit (TRTP) 03/10/2010 6 MN 09/10/2010 04/20/2010 (41) REGION 2 No details
Sanitary Survey, Finished (SNSV) 04/17/2007 3 YR  * 05/22/2007 (35) REGION 2 No details
Water Treatment Plant Site Visit (TRTP) 04/17/2007 6 MN 10/17/2007 05/22/2007 (35) REGION 2 No details
Sanitary Survey, Finished (SNSV) 03/28/2002 3 YR  * DWP Show details