OHA Drinking Water Services
OR41
PWS ID: 94713 ---- COLUMBIA RIDGE LANDFILL/RECYCL
Lead & Copper

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Detailed Results
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90th Percentile Summary Results

Sample Dates Date
Received		 Sample
Count		 Frequency Lead
(mg/L)		 Copper
(mg/L)		 Consumer
Notice Date
8/20/2025  9/8/2025 5 3 years 0 0.024
8/9/2022  9/19/2022 5 3 years 0.0020 0.059
6/17/2019  -  8/20/20199/9/2019 5 3 years 0 0.075
6/23/2016  8/29/2016 5 3 years 0 0.083
7/15/2013  8/9/2013 5 3 years 0 0.273
8/15/2010  9/13/2010 5 3 years 0.0013 0.110
9/21/2004  10/6/2004 5 3 years 0.0020 0.097
1/1/2001  -  8/5/20019/25/2001 5 3 years 0.0040 0.128
1/1/1996  -  9/16/199810/8/1998 5 1 year 0.0014 0.091
1/1/1997  -  9/20/199710/28/1997 5 1 year 0.0016 0.140
1/1/1996  -  9/26/199610/9/1996 5 1 year 0.0020 0.120
1/1/1995  -  8/6/19958/17/1995 5 1 year 0.0020 0.260
1/1/1994  -  1/16/19942/22/1994 5 6 months 0.0015 0.535
1/1/1993  -  6/13/19938/9/1993 5 6 months 0.0010 0.625
10/26/2007  11/16/2007 5 3 years 0 0.126


More information for this water system: SDWIS ID 2851
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