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 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.


Category Significant deficiency or unmet rule requirement Due date Resolved date
Finished Water Storage No flap valve, screen, or equivalent on overflow or drainNot tracked
Finished Water Storage No screened ventNot tracked
Management & Operations Annual CCR not distributed (CWS)Not tracked
Monitoring & Reporting No coliform sampling planNot tracked
Operator Certification No DRC at required certification level Not tracked
Operator Certification No protocol for under-certified operatorNot tracked
Disinfection Free chlorine residual not maintainedNot tracked
Disinfection Chlorine not measured & recordedNot tracked
Disinfection Unable to demonstrate minimum CTs are metNot tracked
Disinfection pH, temperature, and chlorine residual not measured daily at first userNot tracked
Disinfection Failure to calculate CT values correctlyNot tracked
Surface Water Treatment Turbidity standards not metNot tracked
Surface Water Treatment Turbidimeters not calibrated per manufacturer or at least quarterlyNot tracked
Significant deficiency and unmet rule requirement dates were not tracked prior to 1/1/2014.
Water Treatment Plant Site Visit (TRTP) 11/30/2011 6 MN 05/30/2012 12/12/2011 (12) REGION 1 Show details
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