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.
Significant deficiencies and unmet rule requirements:
Category Significant deficiency or unmet rule requirement Due date Resolved date
Management & Operations Annual CCR not distributed (CWS)Mar 31, 2026 * Overdue
Operator Certification No protocol for under-certified operatorMar 31, 2026 * Overdue
Disinfection pH, temperature, and chlorine residual not measured daily at first userMar 31, 2026 * Overdue
Surface Water Treatment Turbidity standards not metMar 31, 2026 * Overdue
Management & Operations Emergency response plan not completed (CWS, NTNC)Jan 30, 2026 Feb 17, 2026 - Late
Disinfection Chlorine not measured & recordedJan 30, 2026 Feb 17, 2026 - Late
Cross Connection Annual summary report not issued (CWS)Mar 31, 2026 * Feb 06, 2026
Surface Water Treatment Turbidimeters not calibrated per manufacturer or at least quarterlyMar 31, 2026 * Feb 17, 2026
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) 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 Hide details
 
Category Significant deficiency or unmet rule requirement Due date Resolved date
Cross Connection Annual summary report not issued (CWS)Jan 08, 2020 Mar 22, 2022 - Late
Finished Water Storage No flap valve, screen, or equivalent on overflow or drainJan 08, 2020 Oct 14, 2022 - Late
Management & Operations Annual CCR not distributed (CWS)Jan 08, 2020 May 31, 2023 - Late
Operator Certification No DRC at required certification level Jan 08, 2020 Jan 01, 2025 - Late
Other Treatment Non-NSF approved chemicalsJan 08, 2020 Oct 24, 2022 - Late
Surface Water Treatment Conventional or direct filtration: Turbidity profile not conducted on individual filters at least quarterlyJan 08, 2020 Oct 24, 2022 - Late
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 Show details
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