OHA Drinking Water Services
OR41
PWS ID: 00922 ---- VERNONIA, CITY OF

Most Recent Water System Survey
Survey Date: Sep 10, 2025
Notification Date: Nov 14, 2025 (65 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:
No deficiencies were identified.


 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) 09/10/2025 3 YR  * 11/14/2025 (65) REGION 1 Show details
Sanitary Survey, Finished (SNSV) 09/27/2022 3 YR  * 11/29/2022 (63) REGION 1 Show details
Water Treatment Plant Site Visit (TRTP) 09/27/2022 3 YR 09/27/2025 11/29/2022 (63) REGION 1 No details
Sanitary Survey, Finished (SNSV) 12/18/2019 3 YR  * 01/31/2020 (44) REGION 1 Show details
Water Treatment Plant Site Visit (TRTP) 12/18/2019 6 MN 06/18/2020 01/31/2020 (44) REGION 1 No details
Sanitary Survey, Finished (SNSV) 04/20/2016 3 YR  * 05/06/2016 (16) REGION 1 Show details
Water Treatment Plant Site Visit (TRTP) 04/20/2016 6 MN 10/20/2016 05/06/2016 (16) REGION 1 No details
Sanitary Survey, Finished (SNSV) 10/16/2013 3 YR  * 11/07/2013 (22) REGION 1 Hide details
  Comments:
The deficiencies noted are as follows:

Treatment and Disinfection Deficiencies
1. Settled water not measured daily - Corrected 12/23/13
2. Chlorine residuals are not measured and recorded as required - Corrected 12/23/13
3. pH, Temperature, and chlorine residual not measured daily at first user- Corrected 12/23/13
4. Failure to calculate CT values correctly - Corrected 12/23/13
Finished Water Storage Deficiencies
1. Hatch not locked or adequately secured - Corrected 12/23/13
2. Roof and access hatch not watertight - Corrected 12/23/13
Monitoring Deficiencies
1. Sampling not current - Corrected 12/23/13
Management & Operations Deficiencies
1. No Operation and Maintenance Manual

Category Deficiency Due Date Resolved Date
Finished Water Storage Hatch not locked or adequately securedNot tracked
Finished Water Storage Roof and access hatch not watertightNot tracked
Management & Operations No operations and maintenance manualNot tracked
Monitoring & Reporting Monitoring not currentNot tracked
Disinfection Chlorine not measured & recorded as requiredNot 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 For conventional filtration: Settled water not measured dailyNot tracked
Deficiency dates were not tracked prior to 1/1/2014.
Water Treatment Plant Site Visit (TRTP) 10/16/2013 6 MN 04/16/2014 REGION 1 Show details
Water Treatment Plant Site Visit (TRTP) 06/29/2011 6 MN 12/29/2011 07/08/2011 (9) REGION 1 Show details
Sanitary Survey, Finished (SNSV) 10/12/2010 3 YR  * 11/09/2010 (28) REGION 1 Show details
Water Treatment Plant Site Visit (TRTP) 10/12/2010 6 MN 04/12/2011 11/09/2010 (28) REGION 1 Show details
Sanitary Survey, Finished (SNSV) 06/12/2007 3 YR  * 06/21/2007 (9) REGION 1 No details
Sanitary Survey, Finished (SNSV) 10/09/2002 3 YR  * DWP Show details