OHA Drinking Water Services
OR41
PWS ID: 90872 ---- NORTHWEST ALUMINUM COMPANY ---- INACTIVE
Lead & Copper

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Detailed Results
Corrosion Control
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90th Percentile Summary Results

Sample Dates Date
Received		 Sample
Count		 Frequency Lead
(mg/L)		 Copper
(mg/L)		 Consumer
Notice Date
12/3/2020  12/22/2020 5 6 months 0.0001 0
5/20/2020  6/2/2020 5 6 months 0 0.001
9/18/2019  10/1/2019 5 3 years 0.0007 0.004
9/7/2016  -  9/30/201610/21/2016 10 3 years 0.0046 0.007
9/26/2013  10/3/2013 5 3 years 0 0.012
9/15/2010  10/12/2010 5 3 years 0 0.009
8/16/2006  -  9/27/200610/4/2006 5 3 years 0 0.032
11/26/2002  -  6/10/20036/16/2003 5 3 years 0.0085 0.925
1/1/1999  -  5/27/199910/18/1999 5 3 years 0.0008 0.007
1/1/1996  -  7/16/19987/30/1998 5 3 years 0.0004 0.023
1/1/1997  -  6/12/19978/7/1997 5 1 year 0 0.020
1/1/1996  -  6/13/19967/12/1996 5 1 year 0 0.052
1/1/1995  -  6/14/19957/5/1995 5 1 year 0.0040 0.003
1/1/1994  -  4/12/19945/9/1994 10 6 months 0.0009 0.017
7/1/1993  -  8/4/199310/19/1993 10 6 months 0 0.079


More information for this water system: SDWIS ID 799
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