Water Quality Events

Events

The majority of these recorded events are based on parameters set for Industrial Users. Small changes in water quality that have no impacts on the safety of drinking water can affect industrial processes. Substances in the drinking water, such as Total Organic Carbons (TOCs), are not a health concern, but they can interfere in the production of electronic components. Questions about any of the events reported below can be directed to Jessica Dorsey or Tacy Steele at 503-615-6702.

Date of Event Event Description Water Quality Impacts
10/18/2017 – ongoing TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent.
09/21/2017 TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent.
06/15/2017 pH level over 8.7 for short period of time (about 45 minutes) Increased pH level caused by temporary overfeed of caustic soda into system. (New caustic pumps were installed for WTP Expansion.)Overfeeding caught quickly, but short period of high pH water produced. No health issues or impacts on drinking water. No known impacts to industrial users reported. Notice Sent.
05/17/2017-06/02/2017 Iron flocculation in Fernhill Reservoirs Higher turbidity in Fernhill Reservoir due to iron floc. Media replacement in WTP filters identified as cause. (It takes time to form oxide coating that pulls iron and manganese out of raw water.) No health issues or impacts on drinking water. No known impacts to industrial users reported. Memo sent.
05/11/2017-05/15/2017 TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent.
11/25/2016-11/28/2016 TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent.
10/07/2016-10/27/2016 TOC levels above 1.0 ppm, due to the first of fall rains. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent.
04/13/2016-05/02/2016 TOC levels above 1.0 ppm, due to Wapato pumping. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent. 
04/29/2016-05/02/2016 Alum dosage above 40 mg/L, due to Wapato pumping. No health issues or impacts on drinking water. Higher Alum dosage can impact industrial processes. Notice sent. 
04/19/2016-04/22/2016 Alum dosage above 40 mg/L, due to Wapato pumping. No health issues or impacts on drinking water. Higher Alum dosage can impact industrial processes. Notice sent. 
12/19/2015 TOC levels above 1.0 ppm. Last day that heavy rains affected TOC levels in 2015. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent. 
12/08/2015-12/12/2015 Alum dosage above 40 mg/L, due to heavy rains and flooding conditions. No health issues or impacts on drinking water. Higher Alum dosage can impact industrial processes. Notice sent. 
11/19/2015 Polymer dosage above .08 mg/L, due to heavy rains affecting river conditions. Only lasted one day. No health issues or impacts on drinking water. Higher Polymer dosage can impact industrial processes. Notice sent. 
10/26/2015-12/13/2015 TOC levels above 1.0 ppm. Extreme weather during this period kept TOCs high – heavy rains and heavy flooding on the Tualatin River. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent. 
03/04/2015-03/29/2015 TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent. 

02/06/2015-02/07/2015

TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent. 
12/20/2014-12/22/2014 TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent. 
12/11/2014-12/13/2014 TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent. 

11/22/2014 – 11/24/2014

TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent. 
10/21/2014 – 11/12/2014 TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent. 
3/26/2014 – 4/30/2014 TOC levels above 1.0 ppm fairly consistently, due to heavy pumping at Wapato. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent
3/20/2014 – 3/22/2014 TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent. 

12/2/2013 – 12/3/2013

TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent.
11/3/2013 – 11/10/2013 TOC levels above 1.0 ppm. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice sent.
10/28/2013 (Lasted only one day) TOC level above 1.0 ppm No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice was sent out to Industrial Users Group.

9/29/2013 – 10/07/2013

TOC levels above 1.0 ppm due to heavy rains. No health issues or impacts on drinking water. High TOCs can impact industrial processes. Notice was sent out to Industrial Users Group.

7/23/2013 -7/27/2013

Cracked Valve on NTL caused leaking, which required a critical repair. No interruption to service.  Customers served w/Evergreen Reservoir & STL. No major water quality impacts.  Pressure decreased to allow service through STL.  Some air in line when service was returned to NTL and pressure returned to normal for the HPZ.
5/23/2013 – 6/02/2013 TOC levels above 1.0 ppm due to heavy rains. No health issues or impacts on drinking water. High TOCs can impact industrial processes.  Notice was sent out to Industrial Users Group.
03/16/2013 (Lasted only 1 day) TOC levels above 1.0 ppm due to activation of large Wapato pump. No health issues or impacts on drinking water. High TOCs can impact industrial processes.  Notice was sent out to Industrial Users Group.

02/13/2013-02/23/2013

TOC levels above 1.0 ppm due to activation of large Wapato pump. No health issues or impacts on drinking water. High TOCs can impact industrial processes.  Notice was sent out to Industrial Users Group.

11/20/2012-11/24/2012

TOC levels above 1.0 ppm   Alum Dose at 40 mg/L.  Poly reached peak dosage of .15 mg/L   Chlorine dosage at 3.0 mg/L.

No health issues or impacts on drinking water. High TOCs and higher chemical dosage can impact industrial processes.  Notice was sent out to Industrial Users Group.
10/29/2012 – 11/07/2012 TOC levels above 1.0 ppm No health issues or impacts on drinking water. High TOCs can impact industrial processes.  Notice was sent out to Industrial Users Group.

10/13/2012 – 10/18/2012

 TOC levels above 1.0 ppm No health issues or impacts on drinking water. High TOCs can impact industrial processes.  Notice was sent out to Industrial Users Group.
06/09/2012 – 06/11/2012  TOC levels above 1.0 ppm No health issues or impacts on drinking water. High TOCs can impact industrial processes.  Notice was sent out to Industrial Users Group.
04/16/2012 TOC levels are above 1.0 ppm No health issues or impacts on drinking water. High TOCs can impact industrial processes.  Notice was sent out to Industrial Users Group.
01/20/2012 TOC levels expected to rise above 1.0 ppm over the weekend, due to torrential rains and snow melt. No health issues or impacts on drinking water. High TOCs can impact industrial processes.  Notice was sent out to Industrial Users Group.
11/17/2011 TOC levels are above 1.0 ppm No health issues or impacts on drinking water. High TOCs can impact industrial processes.  Notice was sent out to Industrial Users Group.
11/04/2011 TOC levels are close to 1.0 ppm No health issues or impacts on drinking water. High TOCs can impact industrial processes.  Notice was sent out to Industrial Users Group.
09/14/2011 TOC Analyzer not working. No water quality impacts, but unable to provide TOC reads until fixed. 
06/21/2010

Big Wapato Pump turned off for remainder of season.  Little pump will continue to run as needed.

TOC levels high due to Wapato and inflow from Carpenter Creek.  Impacts are higher because of dropping river levels and TVID turning off dilution release from Hagg Lake.
03/18/2010  Big Wapato Pump Turned on   10,000 GPM Lake Drainage into Tualatin River.  No detectable impacts on treated water at this time. 
03/08/2010 Two hour power outage pH dipped below 6.8 from 8:00-8:45 p.m. and hit a low point of 6.65 for a few minutes
02/12/2010 Small Wapato Pump Turned on Minimal Impacts
2/20/2009 pH buffer equipment non-operational for approximately four hours low pH (6.1 or so) for about six hours
6/3/08 – 9/15/08 Geosmin Taste/Odor Event  Musty taste and odor