OHA Drinking Water Services
OR41
PWS ID: 01139 ---- MIDLAND WATER ASSOCIATION

Most Recent Water System Survey
Survey date: Nov 27, 2025
Notification date: Jan 12, 2026 (46 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
Surface Water Treatment Turbidity standards not metSep 01, 2026 *
Disinfection Chlorine not measured & recordedMar 02, 2026 Dec 01, 2025
Disinfection No means to adequately determine disinfection contact time under peak flow and minimum storage conditionsMar 02, 2026 Dec 01, 2025
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) 11/27/2025 3 YR  * 01/12/2026 (46) REGION 1 Show details
Sanitary Survey, Finished (SNSV) 03/24/2022 3 YR  * 05/16/2022 (53) DWP Show details
Water Treatment Plant Site Visit (TRTP) 03/24/2022 6 MN 09/24/2022 05/16/2022 (53) DWP No details
Sanitary Survey, Finished (SNSV) 09/14/2017 3 YR  * 10/06/2017 (22) REGION 1 Show details
Water Treatment Plant Site Visit (TRTP) 09/14/2017 1 YR 09/14/2018 10/06/2017 (22) REGION 1 No details
Comprehensive Performance Evaluation (CPE) (CPEV) 01/14/2015 03/12/2015 (57) DWP Show details
Sanitary Survey, Finished (SNSV) 05/30/2014 3 YR  * 06/16/2014 (17) REGION 1 Show details
Water Treatment Plant Site Visit (TRTP) 05/30/2014 1 YR 05/30/2015 06/16/2014 (17) REGION 1 Show details
Sanitary Survey, Finished (SNSV) 11/30/2011 3 YR  * 12/12/2011 (12) REGION 1 Show details
Water Treatment Plant Site Visit (TRTP) 11/30/2011 6 MN 05/30/2012 12/12/2011 (12) REGION 1 Hide details
  Comments:
The deficiencies noted are as follows:

Treatment Deficiencies
Turbidity MCL not met - Corrected 2/15/12
Turbidimeters not calibrated per manufacturer’s recommendations or at least quarterly. - Corrected 2/15/12
Temperature or pH not measured daily at the first user.- Corrected 2/15/12
CT values not met at all times - Corrected 2/15/12
Chlorine residuals not mainted at entry point - Corrected 2/15/12
Chlorine residuals are not recorded as required.- Corrected 2/15/12
Tracer study or alternative not conducted, not using tracer study derived contact time. - Corrected 2/15/12

Finished Water Storage Deficiencies
Hatch not locked or adequately secured.- Corrected 6/18/12
No screened reservoir vent. - Corrected 6/18/12
No flap valve, screen, or equivalent on drain or overflow.- Corrected 6/18/12

Monitoring Deficiencies
No coliform sampling plan.- Corrected 3/6/12

Management & Operations Deficiencies
No written operating protocols for under-certified operators.
No DRC certified at the appropriate level. - Corrected 12/31/12
Annual consumer confidence report not published as required.< p>

Water Treatment Plant Site Visit (TRTP) 03/24/2011 6 MN 09/24/2011 04/08/2011 (15) REGION 1 Show details
Sanitary Survey, Finished (SNSV) 10/02/2008 3 YR  * 10/15/2008 (13) REGION 1 Show details
Water Treatment Plant Site Visit (TRTP) 10/02/2008 6 MN 04/02/2009 10/15/2008 (13) REGION 1 Show details
Sanitary Survey, Finished (SNSV) 08/13/2002 3 YR  * DWP Show details