OHA Drinking Water Services
OR41
PWS ID: 91879 ---- TWIN OAKS ELEMENTARY SD 4J
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
7/16/2024  5 3 years 0.0550 0 9/18/2024
9/24/2020  5 3 years 0.0070 0.072
9/13/2017  5 3 years 0.0111 0.262
9/30/2014  5 3 years 0.0053 0
9/30/2011  10/26/2011 5 3 years 0.0095 0
9/30/2008  10/15/2008 5 3 years 0.0094 0
12/31/2003  6/6/2005 5 1 year 0.0045 0
1/1/2000  -  2/8/20003/9/2000 5 1 year 0 0
1/1/1997  -  12/31/19974/27/1998 5 1 year 0.0095 0.031
1/1/1995  -  5/5/19956/19/1995 10 6 months 0.0039 0
7/1/1994  -  12/29/19941/6/1995 10 6 months 0.0076 0


More information for this water system: SDWIS ID 1070
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