OHA Drinking Water Services
OR41
PWS ID: 94718 ---- CHEMICAL WASTE MGT OF NW INC
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
7/15/2025  7/29/2025 5 3 years 0 0.012
9/13/2022  10/5/2022 5 3 years 0 0.083
6/17/2019  8/22/2019 5 3 years 0.0060 0.115
6/23/2016  8/29/2016 5 3 years 0.0073 0.124
7/15/2013  -  9/26/201312/9/2013 5 3 years 0 0.046
8/15/2010  9/13/2010 5 3 years 0.0016 0.074
10/25/2007  11/16/2007 5 3 years 0.0020 0.103
9/9/2004  9/30/2004 5 3 years 0.0030 0.147
1/1/2001  -  8/5/20019/25/2001 5 3 years 0.0020 0.069
1/1/1996  -  9/16/199810/8/1998 5 3 years 0.0011 0.088
1/1/1997  -  9/26/199710/28/1997 5 1 year 0.0014 0.100
1/1/1996  -  9/4/199610/3/1996 5 1 year 0 0.080
1/1/1995  -  9/17/199510/13/1995 5 1 year 0 0.085
1/1/1994  -  6/28/19947/18/1994 5 6 months 0 0.210
7/1/1993  -  8/30/19939/27/1993 5 6 months 0 0.180


More information for this water system: SDWIS ID 2852
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