OHA Drinking Water Services
OR41
PWS ID: 93427 ---- COLUMBIA RIVER NITROGEN, LLC
Lead & Copper

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90th Percentile Summary Results

Sample Dates Date
Received		 Sample
Count		 Frequency Lead
(mg/L)		 Copper
(mg/L)		 Consumer
Notice Date
6/19/2025  6/30/2025 7 3 years 0.0080 0.094
9/7/2022  7 3 years 0 0.166
9/7/2022  9/21/2022 7 3 years 0.0050 0.166
8/14/2019  8/30/2019 7 3 years 0.0050 0.106
6/27/2017  7/10/2017 7 1 year 0.0060 0.116
9/14/2016  10/4/2016 6 1 year 0.0060 0.228
6/4/2015  8/3/2015 5 1 year 0.0090 0.105
5/31/2012  6/12/2012 5 6 months 0.0038 0.078
7/11/2011  -  11/28/201112/12/2011 10 6 months 0.0130 0.550
1/13/2011  2/3/2011 5 6 months 0.0099 0.720
9/10/2010  2/18/2011 5 3 years 0.0630 0
7/26/2010  8/10/2010 5 3 years 0.0626 0.878
6/6/2004  8/26/2004 5 3 years 0.0055 0.341
1/1/2001  -  7/12/20017/23/2001 5 3 years 0.0108 0.218
1/1/1996  -  7/26/19988/20/1998 5 1 year 0.0067 0.097
1/1/1997  -  7/30/19979/3/1997 5 1 year 0.0138 0.245
1/1/1996  -  10/24/199610/25/1996 5 1 year 0.0090 0.160
1/1/1995  -  8/31/19959/25/1995 5 1 year 0.0040 0.190
1/1/1994  -  6/1/19946/9/1994 5 6 months 0.0060 0.240
7/1/1993  -  12/1/199312/10/1993 5 6 months 0.0065 0.400


More information for this water system: SDWIS ID 3083
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